Phylum
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In biology, a phylum (/ˈfaɪləm/; Template:Plural form: phyla) is a level of classification, or taxonomic rank, that is below kingdom and above class. Traditionally, in botany the term division has been used instead of phylum, although the International Code of Nomenclature for algae, fungi, and plants accepts the terms as equivalent.[1][2][3] Depending on definitions, the animal kingdom Animalia contains about 32 phyla, the plant kingdom Plantae contains about 14 phyla, and the fungus kingdom Fungi contains about eight phyla. Current research in phylogenetics is uncovering the relationships among phyla within larger clades like Ecdysozoa and Embryophyta.
General description
The term phylum was coined in 1866 by Ernst Haeckel from the Greek Script error: No such module "lang". (φῦλον, 'race, stock'), related to Script error: No such module "lang". (φυλή, 'tribe, clan').Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.[4] Haeckel noted that species constantly evolved into new species that seemed to retain few consistent features among themselves and therefore few features that distinguished them as a group ("a self-contained unity"): "perhaps such a real and completely self-contained unity is the aggregate of all species which have gradually evolved from one and the same common original form, as, for example, all vertebrates. We name this aggregate [a] Script error: No such module "Lang". [i.e., stock / tribe] (Script error: No such module "Lang".)."[a] In plant taxonomy, August W. Eichler (1883) classified plants into five groups named divisions, a term that remains in use today for groups of plants, algae and fungi.[1][5] The definitions of zoological phyla have changed from their origins in the six Linnaean classes and the four Script error: No such module "Lang". of Georges Cuvier.[6]
At its most basic, a phylum can be defined in two ways: as a group of organisms with a certain degree of morphological or developmental similarity (the phenetic definition), or a group of organisms with a certain degree of evolutionary relatedness (the phylogenetic definition).[7] Attempting to define a level of the Linnean hierarchy without referring to (evolutionary) relatedness is unsatisfactory, but a phenetic definition is useful when addressing questions of a morphological nature—such as how successful different body plans were.[citation needed]
Definition based on genetic relation
The most important objective measure in the above definitions is the "certain degree" that defines how different organisms need to be members of different phyla. The minimal requirement is that all organisms in a phylum should be clearly more closely related to one another than to any other group.[7] Even this is problematic because the requirement depends on knowledge of organisms' relationships: as more data become available, particularly from molecular studies, we are better able to determine the relationships between groups. So phyla can be merged or split if it becomes apparent that they are related to one another or not. For example, the bearded worms were described as a new phylum (the Pogonophora) in the middle of the 20th century, but molecular work almost half a century later found them to be a group of annelids, so the phyla were merged (the bearded worms are now an annelid family).[8] On the other hand, the highly parasitic phylum Mesozoa was divided into two phyla (Orthonectida and Rhombozoa) when it was discovered the Orthonectida are probably deuterostomes and the Rhombozoa protostomes.[9]
This changeability of phyla has led some biologists to call for the concept of a phylum to be abandoned in favour of placing taxa in clades without any formal ranking of group size.[7]
Definition based on body plan
A definition of a phylum based on body plan has been proposed by paleontologists Graham Budd and Sören Jensen (as Haeckel had done a century earlier). The definition was posited because extinct organisms are hardest to classify: they can be offshoots that diverged from a phylum's line before the characteristics that define the modern phylum were all acquired. By Budd and Jensen's definition, a phylum is defined by a set of characters shared by all its living representatives.
This approach brings some small problems—for instance, ancestral characters common to most members of a phylum may have been lost by some members. Also, this definition is based on an arbitrary point of time: the present. However, as it is character based, it is easy to apply to the fossil record. A greater problem is that it relies on a subjective decision about which groups of organisms should be considered as phyla.
The approach is useful because it makes it easy to classify extinct organisms as "stem groups" to the phyla with which they bear the most resemblance, based only on the taxonomically important similarities.[7] However, proving that a fossil belongs to the crown group of a phylum is difficult, as it must display a character unique to a sub-set of the crown group.[7] Furthermore, organisms in the stem group of a phylum can possess the "body plan" of the phylum without all the characteristics necessary to fall within it. This weakens the idea that each of the phyla represents a distinct body plan.[10]
A classification using this definition may be strongly affected by the chance survival of rare groups, which can make a phylum much more diverse than it would be otherwise.[11]
Known phyla
Animals
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This section needs additional citations for verification. (February 2013) |
Total numbers are estimates; figures from different authors vary wildly, not least because some are based on described species,[12] and some on extrapolations to numbers of undescribed species. For instance, around 25,000–27,000 species of nematodes have been described, while published estimates of the total number of nematode species include 10,000–20,000; 500,000; 10 million; and 100 million.[13]
| Protostome | Nephrozoa | Bilateria | |
| Deuterostome | |||
| Basal/disputed | |||
| Vendobionta | |||
| Others | |||
| Phylum | Meaning | Common name | Distinguishing characteristic | Taxa described |
|---|---|---|---|---|
| Agmata | Fragmented | Calcareous conical shells | 5 species, extinct | |
| Annelida | Little ring [14]Template:Rp | Segmented worms, annelids | Multiple circular segments | Script error: No such module "Number table sorting".+ extant |
| Arthropoda | Jointed foot | Arthropods | Segmented bodies and jointed limbs, with chitin exoskeleton | Script error: No such module "Number table sorting".+ extant;[12] 20,000+ extinct |
| Brachiopoda | Arm foot[14]Template:Rp | Lampshells[14]Template:Rp | Lophophore and pedicle | Script error: No such module "Number table sorting".–500 extant; 12,000+ extinct |
| Bryozoa (Ectoprocta) | Moss animals | Moss animals, sea mats, ectoprocts[14]Template:Rp | Lophophore, no pedicle, ciliated tentacles, anus outside ring of cilia | Script error: No such module "Number table sorting". extant[12] |
| Chaetognatha | Longhair jaw | Arrow worms[14]Template:Rp | Chitinous spines either side of head, fins | Script error: No such module "Number table sorting". extant |
| Chordata | With a cord | Chordates | Hollow dorsal nerve cord, notochord, pharyngeal slits, endostyle, post-anal tail | Script error: No such module "Number table sorting".+[12] |
| Cnidaria | Stinging nettle | Cnidarians | Nematocysts (stinging cells) | Script error: No such module "Number table sorting".[12] |
| Ctenophora | Comb bearer | Comb jellies[14]Template:Rp | Eight "comb rows" of fused cilia | Script error: No such module "Number table sorting".–150 extant |
| Cycliophora | Wheel carrying | Circular mouth surrounded by small cilia, sac-like bodies | Script error: No such module "Number table sorting".+ | |
| Dicyemida | Lozenge animal | Single anteroposterior axial celled endoparasites, surrounded by ciliated cells | Script error: No such module "Number table sorting".+ | |
| Echinodermata | Spiny skin | Echinoderms[14]Template:Rp | Fivefold radial symmetry in living forms, mesodermal calcified spines | Script error: No such module "Number table sorting". extant;[12] approx. 13,000 extinct |
| Entoprocta | Inside anus[14]Template:Rp | Goblet worms | Anus inside ring of cilia | Script error: No such module "Number table sorting". |
| Gastrotricha | Hairy stomach[14]Template:Rp | Hairybellies | Two terminal adhesive tubes | Script error: No such module "Number table sorting". |
| Gnathostomulida | Jaw orifice | Jaw worms[14]Template:Rp | Tiny worms related to rotifers with no body cavity | Script error: No such module "Number table sorting". |
| Hemichordata | Half cord[14]Template:Rp | Acorn worms, hemichordates | Stomochord in collar, pharyngeal slits | Script error: No such module "Number table sorting". extant |
| Kinorhyncha | Motion snout | Mud dragons | Eleven segments, each with a dorsal plate | Script error: No such module "Number table sorting". |
| Loricifera | Armour bearer | Brush heads | Umbrella-like scales at each end | Script error: No such module "Number table sorting". |
| Micrognathozoa | Tiny jaw animals | Accordion-like extensible thorax | Script error: No such module "Number table sorting". | |
| Mollusca | Soft[14]Template:Rp | Mollusks/molluscs | Muscular foot and mantle round shell | Script error: No such module "Number table sorting".+ extant;[12] 80,000+ extinct[15] |
| Monoblastozoa (Nomen inquirendum) |
One sprout animals | distinct anterior/posterior parts and being densely ciliated, especially around the "mouth" and "anus". | 1 | |
| Nematoda | Thread like | Roundworms, threadworms, eelworms, nematodes[14]Template:Rp | Round cross section, keratin cuticle | Script error: No such module "Number table sorting".[12] |
| Nematomorpha | Thread form[14]Template:Rp | Horsehair worms, Gordian worms[14]Template:Rp | Long, thin parasitic worms closely related to nematodes | Script error: No such module "Number table sorting". |
| Nemertea | A sea nymph[14]Template:Rp | Ribbon worms[14]Template:Rp | Unsegmented worms, with a proboscis housed in a cavity derived from the coelom called the rhynchocoel | Script error: No such module "Number table sorting". |
| Onychophora | Claw bearer | Velvet worms[14]Template:Rp | Worm-like animal with legs tipped by chitinous claws | Script error: No such module "Number table sorting". extant |
| Orthonectida | Straight swimmer | Parasitic, microscopic, simple, wormlike organisms | Script error: No such module "Number table sorting". | |
| Petalonamae | Shaped like leaves | An extinct phylum from the Ediacaran. They are bottom-dwelling and immobile, shaped like leaves (frondomorphs), feathers or spindles. | 3 classes, extinct | |
| Phoronida | Zeus's mistress | Horseshoe worms | U-shaped gut | Script error: No such module "Number table sorting". |
| Placozoa | Plate animals | Trichoplaxes, placozoans[14]Template:Rp | Differentiated top and bottom surfaces, two ciliated cell layers, amoeboid fiber cells in between | Script error: No such module "Number table sorting".+ |
| Platyhelminthes | Flat worm[14]Template:Rp | Flatworms[14]Template:Rp | Flattened worms with no body cavity. Many are parasitic. | Script error: No such module "Number table sorting".[12] |
| Porifera | Pore bearer | Sponges[14]Template:Rp | Perforated interior wall, simplest of all known animals | Script error: No such module "Number table sorting". extant[12] |
| Priapulida | Little Priapus | Penis worms | Penis-shaped worms | Script error: No such module "Number table sorting". |
| Proarticulata | Before articulates | An extinct group of mattress-like organisms that display "glide symmetry." Found during the Ediacaran. | 3 classes, extinct | |
| Rotifera | Wheel bearer | Rotifers[14]Template:Rp | Anterior crown of cilia | Script error: No such module "Number table sorting".[12] |
| Saccorhytida | Saccus : "pocket" and "wrinkle" | Saccorhytus is only about 1 mm (1.3 mm) in size and is characterized by a spherical or hemispherical body with a prominent mouth. Its body is covered by a thick but flexible cuticle. It has a nodule above its mouth. Around its body are 8 openings in a truncated cone with radial folds. Considered to be a deuterostome[16] or an early ecdysozoan.[17] | 2 species, extinct | |
| Tardigrada | Slow step | Water bears, moss piglets | Microscopic relatives of the arthropods, with a four segmented body and head | Script error: No such module "Number table sorting". |
| Trilobozoa | Three-lobed animal | Trilobozoans | A taxon of mostly discoidal organisms exhibiting tricentric symmetry. All are Ediacaran-aged | 18 genera, extinct |
| Vetulicolia | Ancient dweller | Vetulicolians | Might possibly be a subphylum of the chordates. Their body consists of two parts: a large front part and covered with a large "mouth" and a hundred round objects on each side that have been interpreted as gills or openings near the pharynx. Their posterior pharynx consists of 7 segments. | 15 species, extinct |
| Xenacoelomorpha | Strange hollow form | Xenacoelomorphs | Small, simple animals. Bilaterian, but lacking typical bilaterian structures such as gut cavities, anuses, and circulatory systems[18] | Script error: No such module "Number table sorting".+ |
| Total: 39 | 1,525,000[12] |
Plants
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The kingdom Plantae is defined in various ways by different biologists (see Current definitions of Plantae). All definitions include the living embryophytes (land plants), to which may be added the two green algae divisions, Chlorophyta and Charophyta, to form the clade Viridiplantae. The table below follows the influential (though contentious) Cavalier-Smith system in equating "Plantae" with Archaeplastida,[19] a group containing Viridiplantae and the algal Rhodophyta and Glaucophyta divisions.
The definition and classification of plants at the division level also varies from source to source, and has changed progressively in recent years. Thus some sources place horsetails in division Arthrophyta and ferns in division Monilophyta,Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. while others place them both in Monilophyta, as shown below. The division Pinophyta may be used for all gymnosperms (i.e. including cycads, ginkgos and gnetophytes),[20] or for conifers alone as below.
Since the first publication of the APG system in 1998, which proposed a classification of angiosperms up to the level of orders, many sources have preferred to treat ranks higher than orders as informal clades. Where formal ranks have been provided, the traditional divisions listed below have been reduced to a very much lower level, e.g. subclasses.[21]
| Archaeplastida | Biliphyta[19] | Other algae | |
| Viridiplantae | Green algae | ||
| Embryophyte (Land plants) |
| Division | Meaning | Common name | Distinguishing characteristics | Species described |
|---|---|---|---|---|
| Anthocerotophyta[22] | Anthoceros-like plants | Hornworts | Horn-shaped sporophytes, no vascular system | Script error: No such module "Number table sorting".–300+ |
| Bryophyta[22] | Bryum-like plants, moss plants | Mosses | Persistent unbranched sporophytes, no vascular system | Script error: No such module "Number table sorting". |
| Charophyta | Chara-like plants | Charophytes | Script error: No such module "Number table sorting". | |
| Chlorophyta | (Yellow-)green plants[14]Template:Rp | Chlorophytes | Script error: No such module "Number table sorting". | |
| CycadophytaLua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. | Cycas-like plants, palm-like plants | Cycads | Seeds, crown of compound leaves | Script error: No such module "Number table sorting".–200 |
| GinkgophytaLua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. | Ginkgo-like plants | Ginkgophytes | Seeds not protected by fruit | Script error: No such module "Number table sorting". extant; 50+ extinct |
| Glaucophyta | Blue-green plants | Glaucophytes | Script error: No such module "Number table sorting". | |
| GnetophytaLua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. | Gnetum-like plants | Gnetophytes | Seeds and woody vascular system with vessels | Script error: No such module "Number table sorting". |
| LycophytaLua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. | Lycopodium-like plants Wolf plants |
Clubmosses | Microphyll leaves, vascular system | Script error: No such module "Number table sorting". extant |
| Angiospermae | Seed container | Flowering plants, angiosperms | Flowers and fruit, vascular system with vessels | Script error: No such module "Number table sorting". |
| Marchantiophyta,[23] Hepatophyta[22] |
Marchantia-like plants Liver plants |
Liverworts | Ephemeral unbranched sporophytes, no vascular system | Script error: No such module "Number table sorting". |
| Polypodiophyta | Polypodium-like plants |
Ferns | Megaphyll leaves, vascular system | Script error: No such module "Number table sorting". |
| Picozoa | Extremely small animals | Picozoans, picobiliphytes | 1 | |
| Pinophyta,[20] ConiferophytaLua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. |
Pinus-like plants Cone-bearing plant |
Conifers | Cones containing seeds and wood composed of tracheids | Script error: No such module "Number table sorting". extant |
| Prasinodermophyta | Prasinoderma-like plants | Picozoans, picobiliphytes, biliphytes | 8 | |
| Rhodophyta | Red plants | Red algae | Use phycobiliproteins as accessory pigments. | Script error: No such module "Number table sorting". |
| Total: 16 |
Fungi
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| Division | Meaning | Common name | Distinguishing characteristics | Species described |
|---|---|---|---|---|
| Ascomycota | Bladder fungus[14]Template:Rp | Ascomycetes,[14]Template:Rp sac fungi | Tend to have fruiting bodies (ascocarp).[24] Filamentous, producing hyphae separated by septa. Can reproduce asexually. | 30,000 |
| Basidiomycota | Small base fungus[14]Template:Rp | Basidiomycetes,[14]Template:Rp club fungi | Bracket fungi, toadstools, smuts and rust. Sexual reproduction.[citation needed] | 31,515 |
| Blastocladiomycota | Offshoot branch fungus[25] | Blastoclads | Less than 200 | |
| Chytridiomycota | Little cooking pot fungus[26] | Chytrids | Predominantly Aquatic saprotrophic or parasitic. Have a posterior flagellum. Tend to be single celled but can also be multicellular.[27][28][29] | 1000+ |
| Glomeromycota | Ball of yarn fungus[14]Template:Rp | Glomeromycetes, AM fungi[14]Template:Rp | Mainly arbuscular mycorrhizae present, terrestrial with a small presence on wetlands. Reproduction is asexual but requires plant roots. | 284 |
| Microsporidia | Small seeds[30] | Microsporans[14]Template:Rp | 1400 | |
| Neocallimastigomycota | New beautiful whip fungus[31] | Neocallimastigomycetes | Predominantly located in digestive tract of herbivorous animals. Anaerobic, terrestrial and aquatic.[32] | approx. 20 [33] |
| Zygomycota | Pair fungus[14]Template:Rp | Zygomycetes[14]Template:Rp | Most are saprobes and reproduce sexually and asexually.[32] | approx. 1060 |
| Total: 8 |
Phylum Microsporidia is generally included in kingdom Fungi, though its exact relations remain uncertain,[34] and it is considered a protozoan by the International Society of Protistologists[35] (see Protista, below). Molecular analysis of Zygomycota has found it to be polyphyletic (its members do not share an immediate ancestor),[36] which is considered undesirable by many biologists. Accordingly, there is a proposal to abolish the Zygomycota phylum. Its members would be divided between phylum Glomeromycota and four new subphyla incertae sedis (of uncertain placement): Entomophthoromycotina, Kickxellomycotina, Mucoromycotina, and Zoopagomycotina.[34]
Protists
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The kingdom Protista (or Protoctista) is included in the traditional five- or six-kingdom model, where it can be defined as containing all eukaryotes that are not plants, animals, or fungi.[14]Template:Rp Protista is a paraphyletic taxon,[37] which is less acceptable to present-day biologists than in the past. Proposals have been made to divide it among several new kingdoms, such as Protozoa and Chromista in the Cavalier-Smith system.[38]
Protist taxonomy has long been unstable,[39] with different approaches and definitions resulting in many competing classification schemes. Many of the phyla listed below are used by the Catalogue of Life,[40] and correspond to the Protozoa-Chromista scheme,[35] with updates from the latest (2022) publication by Cavalier-Smith.[41] Other phyla are used commonly by other authors, and are adapted from the system used by the International Society of Protistologists (ISP). Some of the descriptions are based on the 2019 revision of eukaryotes by the ISP.[42]
| Stramenopiles | Diaphoretickes | |
| Alveolata | ||
| Rhizaria | ||
| "Hacrobia" | ||
| Amorphea | ||
| Excavates | ||
| Orphan groups | ||
| Phylum | Meaning | Common name | Distinguishing characteristics | Species described | Image |
|---|---|---|---|---|---|
| Amoebozoa | Amorphous animals | Amoebozoans | Presence of pseudopodia for amoeboid movement, tubular cristae.[42] | Script error: No such module "Number table sorting".[43] | File:Amoeba proteus.jpg |
| Apicomplexa | Apical infolds[44] | Apicomplexans, sporozoans | Mostly parasitic, at least one stage of the life cycle with flattened subpellicular vesicles and a complete apical complex, non-photosynthetic apicoplast.[42] | Script error: No such module "Number table sorting".[44] | File:Toxoplasma gondii.jpg |
| Apusozoa (paraphyletic) |
Apusomonas-like animals | Gliding biciliates with two or three connectors between centrioles | 32 | File:Podomonas kaiyoae C.jpg | |
| Bigyra | Two rings | Stramenopiles with a double helix in ciliary transition zone | File:Aplanonet3.jpg | ||
| Cercozoa | Flagellated animal | Cercozoans | Defined by molecular phylogeny, lacking distinctive morphological or behavioural characters.[42] | File:Euglypha sp.jpg | |
| Chromerida | Chromera-like organisms | Chrompodellids, chromerids, colpodellids[45] | Biflagellates, chloroplasts with four membranes, incomplete apical complex, cortical alveoli, tubular cristae.[42] | 8[46] | File:Vitrella brassicaformis LM Michalek 2020.png |
| Choanozoa (paraphyletic) |
Funnel animals[14] | Opisthokont protists | Filose pseudopods; some with a colar of microvilli surrounding a flagellum | Script error: No such module "Number table sorting".[43] | File:Desmarella moniliformis.jpg |
| Ciliophora | Cilia bearers | Ciliates | Presence of multiple cilia and a cytostome. | Script error: No such module "Number table sorting".[47] | File:Paramecium bursaria.jpg |
| Cryptista | Hidden[14] | Defined by molecular phylogeny, flat cristae.[42] | Script error: No such module "Number table sorting".[46][42] | File:Rhodomonas salina CCMP 322.jpg | |
| Dinoflagellata | Whirling flagellates[14] | Dinoflagellates | Biflagellates with a transverse ribbon-like flagellum with multiple waves beating to the cell's left and a longitudinal flagellum beating posteriorly with only one or few waves.[42] | Script error: No such module "Number table sorting". extant 955 fossil[46] |
File:CSIRO ScienceImage 6736 dinoflagellate.jpg |
| Endomyxa | Within mucus[14][48] | Defined by molecular phylogeny,[42] typically plasmodial endoparasites of other eukaryotes.[48] | File:Vampyrella lateritia.jpg | ||
| Eolouka (paraphyletic) |
Early groove[49] | Heterotrophic biflagellates with ventral feeding groove.[49] | Script error: No such module "Number table sorting". | File:Stygiella incarcerata.jpg | |
| Euglenozoa | True eye animals | Biflagellates, one of the two cilia inserted into an apical or subapical pocket, unique ciliary configuration.[42] | Script error: No such module "Number table sorting". extant 20 fossil[46] |
File:Euglenoid movement.jpg | |
| Haptista | Fasten[14] | Thin microtubule-based appendages for feeding (haptonema in haptophytes, axopodia in centrohelids), complex mineralized scales.[42] | Script error: No such module "Number table sorting". extant 1,205 fossil[46] |
File:Coccolithus pelagicus 2.jpg | |
| Hemimastigophora | Incomplete or atypical flagellates[50] | Hemimastigotes[51] | Ellipsoid or vermiform phagotrophs, two slightly spiraling rows of around 12 cilia each, thecal plates below the membrane supported by microtubules and rotationally symmetrical, tubular and saccular cristae.[42][50] | Script error: No such module "Number table sorting".[52] | File:Hemimastix amphikineta.png |
| Heterolobosea;[53] Percolozoa |
Percolomonas-like animals | Heteroloboseans, amoebomastigotes[14] | Complex life cycle containing amoebae, flagellates and cysts.[42] Amoeboflagellates with an amoeba, a flagellate, and a cyst stage in their life cycles. Amoebae usually cylindrical, with a monopodial locomotive form, relatively fast-moving via eruptive lobopodia. Flagellates usually with two or four flagella that arise at the anterior end of a feeding groove. Golgi apparatus lacking a classic stacked form. Mitochondria with discoidal cristae, some species with acristate, hydrogen-producing mitochondrion-related organelles.[53] | Script error: No such module "Number table sorting".[53] | File:Naegleria fowleri lifecycle stages.JPG |
| Malawimonada | Malawimonas-like organisms | Malawimonads | Small free-living bicilates with two kinetosomes, one or two vanes in posterior cilium. | Script error: No such module "Number table sorting".[54] | File:Malawimonasms.jpg |
| Metamonada | Middle monads | Metamonads | Anaerobic or microaerophilic, some without mitochondria; four kinetosomes per kinetid | File:Giardia muris trophozoite SEM 11643.jpg | |
| Ochrophyta; Heterokontophyta |
Ochre plants, heterokont plants | Heterokont algae, stramenochromes, ochrophytes, heterokontophytes | Biflagellates with tripartite mastigonemes, chloroplasts with four membranes and chlorophylls a and c, tubular cristae.[42] | Script error: No such module "Number table sorting". extant 2,262 fossil[46] |
File:Diatoms through the microscope.jpg |
| Opisthosporidia (often considered fungi) |
Opisthokont spores[55] | Parasites with chitinous spores and extrusive host-invasion apparatus | File:Fibrillanosema spore.jpg | ||
| Perkinsozoa | Perkinsus-like animals | Perkinsozoans, perkinsids | Parasitic biflagellates, incomplete apical complex, formation of zoosporangia or undifferentiated cells via a hypha-like tube.[42] | Script error: No such module "Number table sorting". | File:Dinovorax pyriformis PMC5609580 fig1c.png |
| Provora | Devouring voracious protists[56] | Defined by molecular phylogeny, free-living eukaryovorous heterotrophic biflagellates with ventral groove and extrusomes.[56] | Script error: No such module "Number table sorting".[56] | File:Outline drawing of Ubysseya fretuma.svg | |
| Pseudofungi | False fungi | Defined by molecular phylogeny, phagotrophic heterokonts with a helical ciliary transition zone.[57] | Script error: No such module "Number table sorting".[58] | File:Phytophthora cactorum.jpg | |
| Retaria | Reticulopodia-bearing organisms[48] | Feeding by reticulopodia (or axopodia) typically projected through various types of skeleton, closed mitosis.[59] | Script error: No such module "Number table sorting". extant 50,000 fossil |
File:Foraminifères de Ngapali.jpg | |
| Sulcozoa (paraphyletic) |
Groove-bearing animals[49] | Aerobic flagellates (none, 1, 2 or 4 flagella) with dorsal semi-rigid pellicle of one or two submembrane dense layers, ventral feeding groove, branching ventral pseudopodia, typically filose.[49] | Script error: No such module "Number table sorting".+ | File:Collodictyon telophase constrict.jpg | |
| Telonemia | Telonema-like organisms[60] | Telonemids[61] | Phagotrophic pyriform biflagellates with a unique complex cytoskeleton, tubular cristae, tripartite mastigonemes, cortical alveoli.[60][61] | Script error: No such module "Number table sorting". | File:Telonema rivulare (electron micrography).jpg |
| Total: 26, but see below. | |||||
The number of protist phyla varies greatly from one classification to the next. The Catalogue of Life includes Rhodophyta and Glaucophyta in kingdom Plantae,[40] but other systems consider these phyla part of Protista.[62] In addition, less popular classification schemes unite Ochrophyta and Pseudofungi under one phylum, Gyrista, and all alveolates except ciliates in one phylum Myzozoa, later lowered in rank and included in a paraphyletic phylum Miozoa.[41] Even within a phylum, other phylum-level ranks appear, such as the case of Bacillariophyta (diatoms) within Ochrophyta. These differences became irrelevant after the adoption of a cladistic approach by the ISP, where taxonomic ranks are excluded from the classifications after being considered superfluous and unstable. Many authors prefer this usage, which lead to the Chromista-Protozoa scheme becoming obsolete.[42]
Bacteria
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Currently there are 41 bacterial phyla (not including "Cyanobacteria") that have been validly published according to the Bacteriological Code[63]
- Abditibacteriota
- Acidobacteriota, phenotypically diverse and mostly uncultured
- Actinomycetota, High-G+C Gram positive species
- Aquificota, deep-branching
- Armatimonadota
- Atribacterota
- Bacillota, Low-G+C Gram positive species, such as the spore-formers Bacilli (aerobic) and Clostridia (anaerobic)
- Bacteroidota
- Balneolota
- Bdellovibrionota
- Caldisericota, formerly candidate division OP5, Caldisericum exile is the sole representative
- Calditrichota
- Campylobacterota
- Chlamydiota
- Chlorobiota, green sulphur bacteria
- Chloroflexota, green non-sulphur bacteria
- Chrysiogenota, only 3 genera (Chrysiogenes arsenatis, Desulfurispira natronophila, Desulfurispirillum alkaliphilum)
- Coprothermobacterota
- Deferribacterota
- Deinococcota, Deinococcus radiodurans and Thermus aquaticus are "commonly known" species of this phyla
- Dictyoglomota
- Elusimicrobiota, formerly candidate division Thermite Group 1
- Fibrobacterota
- Fusobacteriota
- Gemmatimonadota
- Ignavibacteriota
- Kiritimatiellota
- Lentisphaerota, formerly clade VadinBE97
- Mycoplasmatota, notable genus: Mycoplasma
- Myxococcota
- Nitrospinota
- Nitrospirota
- Planctomycetota
- Pseudomonadota, the most well-known phylum, containing species such as Escherichia coli or Pseudomonas aeruginosa
- Rhodothermota
- Spirochaetota, species include Borrelia burgdorferi, which causes Lyme disease
- Synergistota
- Thermodesulfobacteriota
- Thermomicrobiota
- Thermotogota, deep-branching
- Verrucomicrobiota
Archaea
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- Nitrososphaerota
- Thermoproteota, second most common archaeal phylum
Other phyla that have been proposed, but not validly named, include:
- "Euryarchaeota", most common archaeal phylum
- "Korarchaeota"
- "Nanoarchaeota", ultra-small symbiotes, single known species
See also
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Notes
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References
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External links
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- Are phyla "real"? Is there really a well-defined "number of animal phyla" extant and in the fossil record?
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