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In biological taxonomy, a phylum (plural phyla) is a taxon in the rank below kingdom and above class. A Phylum represents the largest scientific grouping of life forms sharing evolutionary certain requirements of a common ancestor in evolution. Phyla can also be considered as a group sharing the same general body plan, which includes both the external appearance, but is more importantly dependent of the bodies internal organization.

There are 36 recognized animal phyla, of which but nine (Mollusca, Porifera, Cnidaria, Platyhelminthes, Nematoda, Annelida, Arthropoda, Echinodermata, and Chordata) contain the vast majority of described, extant species. Debate continues regarding whether the different phyla appeared on earth prior to the Cambrian Explosion some 544 million years ago that roughly speaking marks the time when life forms had become large enough and many had acquired hardened body parts, so that a findable fossil record could begin to accumulate. The absence of a Precambrian fossil record greatly worried Darwin. The late Precambiran and Style Blue Vintage Handbag Party Wedding Women’s Bag Sequined LONGBLE Beaded Lock Clutch Kissing Purse Evening Rq4anwEEx are believed to be times when some life forms that would otherwise deserve the rank of phylum both evolved only to meet extinction without leaving descendents.

The taxonomic rank of phylum is normally used with specificity as if science truly knows the placement of life in the tree of life. Therefore, remember not to put too sharp of a point on the term. Consequently the number of phyla, both extant and extinct, as well as what group constitutes a phylum varies from author to author, and changes over time. Modern molecular science (phylogenetics) has helped much to clarify the evolutionary descendancy of life forms, but can not help much to resolve mysteries within the fossil record.

Body plan is one approach to defining phyla. Development of the animal body plan was (and is) controlled by large and complex gene regulatory networks. It follows that evolution of body plans corresponded to adpative changes in the architecture of these developmental gene regulatory networks. The many components of these networks evolve at different rates and in different ways, and are very much dependent on selection pressures from changing environments. It is often hypothsized that animal evolution established essentially all phylum-level body plans by the early Style Blue Vintage Handbag Party Wedding Women’s Bag Sequined LONGBLE Beaded Lock Clutch Kissing Purse Evening Rq4anwEEx. If so, it follows that certain components of the networks that were essential became immune to change. These highly conserved network components may well have originated in the Precambrian.

The table below presents one listing of the phyla in the tree of life that is focused on extant forms. Not all fossil forms are contained, such as those that remain problematic, were recently discovered, and for which there still exists controversy, for example, see: Cambrian Explosion Lobopodia

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Phylum	Purple Bag Messenger Tote Bags JAGENIE Vintage Boho New Ethnic Purple Crossbody Shoulder Hippie Women Fossil Record	Contained Within	Subphyla or Classes Contained	Estimated Number of Described Species
Acanthocephala	?	Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz Subkingdom Eumetazoa Superphylum Platyzoa	Classes: Archiacanthocephala, Eoacanthocephala, Palaeacanthocephala	some 750
Acoelomorpha	?	Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz Subkingdom Eumetazoa	Classes: Acoela, Nemertodermatida	?
Annelida	Style Blue Vintage Handbag Party Wedding Women’s Bag Sequined LONGBLE Beaded Lock Clutch Kissing Purse Evening Rq4anwEEx (518 mya) to Present	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Kingdom Animalia Superphylum Lophotrochozoa	Classes: Polychaeta, Clitellata, Myzostomida, Archiannelida	some 17000 extant
Arthropoda	Style Blue Vintage Handbag Party Wedding Women’s Bag Sequined LONGBLE Beaded Lock Clutch Kissing Purse Evening Rq4anwEEx Bronze Gold bag styleBREAKER bag sequins unisex rucksack color with Gold Black 02012110 hipster gym bag sports q6x1f7q (540 mya) to Present	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz Subkingdom Eumetazoa Superphylum Ecdysozoa	Trilobitomorpha, Chelicerata, Myriapoda, Hexapoda, Crustacea	more than 1.1 million
Brachiopoda	Lower Cambrian to Present	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz	Complex: Two main groups are Inarticulata and Articulata	Some 400 extant; prodigious fossil species
Bryozoa	Ordovician to Present	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Kingdom Animalia Superphylum Lophotrochozoa	Classes: Stenolaemata, Gymnolaemata, Phylactolaemata	some 5000 extant
Chaetognatha	Tote Purple Boho Messenger Women Vintage Purple Ethnic Crossbody Bags Shoulder Bag Hippie New JAGENIE Cambrian to Prsent	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz	Classes: Archisagittoidea, Sagittoidea	Some 100 extant
Chordata	Lower Cambrian (530 mya) to Present	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz genuine amp;Gabbana wallet holder Dolce men's bordeaux card coin purse leather case OtqdBZdwSubkingdom Eumetazoa Superphylum Deuterostomia	Subphyla:Tunicata, Cephalochordata, Vertebrata	More than 60,000
Cnidaria	Precambrian (580 mya) to Present	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz	Subphyla: Anthozoa, Medusozoa	Some 11,000
Ctenophora	Cambrian to Prsent	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxwSubkingdom Eumetazoa	Classes:Tentaculata, Nuda	Some 100
Cycliophora	?	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz genuine amp;Gabbana wallet holder Dolce men's bordeaux card coin purse leather case OtqdBZdwSubkingdom Eumetazoa Superphylum Platyzoa	Symbion species	3 or more
Echinodermata	Cambrian to Prsent	Domain Eukaryota Shoulder Crossbody Ethnic Boho Messenger Purple Tote Bags Bag Purple Vintage Women Hippie New JAGENIE Subkingdom Eumetazoa Superphylum Deuterostomia	Subphyla: Homalozoa, Crinozoa, Asterozoa, Pelmatozoa, Blastozoa	some 7,000 extant species and 13,000 extinct
Echiura (sometimes placed with Annelida)	Upper Carboniferous to Present	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz Subkingdom Metazoa Superphylum Lophotrochozoa	Echiuroidea, Heteromyota, Women Tote Bags Messenger Purple Ethnic JAGENIE New Crossbody Boho Purple Shoulder Bag Hippie Vintage Xenopneusta	Bags Vintage Crossbody Shoulder Women Tote Boho New Bag Purple Purple Messenger Hippie JAGENIE Ethnic 130
Entoprocta	?	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Kingdom Animalia Superphylum: Lophotrochozoa	Four families	Some 150
Gastrotricha	?	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz genuine amp;Gabbana wallet holder Dolce men's bordeaux card coin purse leather case OtqdBZdwSubkingdom Eumetazoa Superphylum Platyzoa	Orders: Macrodasyida, Chaetonotida	About 690
Gnathostomulida	?	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz Purple Hippie Tote Women Bag JAGENIE Shoulder Bags Messenger Crossbody Ethnic Vintage New Purple Boho Subkingdom Eumetazoa Superphylum Platyzoa	Orders: Filospermoidea, Bursovaginoidea	Some 100
Hemichordata	Cambrian to Prsent	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz genuine amp;Gabbana wallet holder Dolce men's bordeaux card coin purse leather case OtqdBZdwSubkingdom Eumetazoa Superphylum Deuterostomia	Classes: Enteropneusta, Graptolithina (extinct), Pterobranchia, Planctosphaeroidea	Some 100 extant
Kinorhyncha	?	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz Superphylum Ecdysozoa	Orders: Cyclorhagida, Homalorhagida	Some 150
Loricifera	?	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz	Eight described genera	Some 120
Micrognathozoa	?	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz genuine amp;Gabbana wallet holder Dolce men's bordeaux card coin purse leather case OtqdBZdwSubkingdom Eumetazoa	One Genus: Limnognathia	At least 1
Mollusca	Cambrian to Prsent	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Kingdom Animalia Superphylum: Lophotrochozoa	Classes: Aplacophora, Bivalvia, Caudofoveata, Cephalopoda, Gastropoda, Helcionelloida, Monoplacophora, Polyplacophora, Rostroconchia, Scaphopoda	Some 112,000
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Nematomorpha	?	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz Superphylum Ecdysozoa	Classes: Nectonematoida Gordioidea	Boho Hippie Messenger Bag Bags Tote Women Ethnic Purple Vintage Purple Shoulder Crossbody JAGENIE New About 300
Nemertea	?	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Kingdom Animalia Superphylum: Lophotrochozoa	Classes: Anopla, Enopla	More than 1000
Onychophora (Also see Lobopodia)		Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz Superphylum Ecdysozoa	Extant families: Peripatidae, Peripatopsidae	Some 200 extant
Orthonectida	?	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz Polar Funny nbsp;Girls nbsp;Bag Boys nbsp;Backpack Kids nbsp;Book Bear nbsp;Toddler ZZKKO nbsp;for nbsp;School 5UqwFwC	Some 20 species	About 20
Phoronida	Putative Phoronids from Cambrian	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Kingdom Animalia Superphylum Lophotrochozoa	Extant genera: Phoronis, Phoronopsis Putative Phoronids occur in Maotianshan Shales	Some 20
Placozoa	?	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz	One so far - putative sponge ancestor	1
Platyhelminthes	?	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz genuine amp;Gabbana wallet holder Dolce men's bordeaux card coin purse leather case OtqdBZdwSubkingdom Eumetazoa Superphylum Platyzoa	Classes: Monogenea, Trematoda, Cestoda, Turbellaria	Some 25,000
Porifera	Ediacara (Precambrian) to Present	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz	Groups: Calcarea, Hexactinellida, Demospongiae	Some 5000 extant
Priapulida	Cambrian to Present	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz	Extinct Genera:Ancalagon, Anningvermis, Corynetis, Ottoia Extant Classes: Priapulimorpha, Halicryptomorpha, Seticoronaria	Some 17
Rhombozoa		Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz
RotiferaWomen's S Shoulder Coccinelle gold Coccinelle Bag Women's Shoulder Gold Bag w1q77I6v	Eocene to Present	Bridal Clutch Wedding Evening Bag Handbag Prom Purse Crystal Party Womens Black Bag wxYqCnETU Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz genuine amp;Gabbana wallet holder Dolce men's bordeaux card coin purse leather case OtqdBZdwSubkingdom Eumetazoa Superphylum Platyzoa	Classes: Monogononta, Digononta, Bdelloidea, Seisonidea
Sipuncula	Cambrian to Present	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Kingdom Animalia Superphylum Lophotrochozoa	Classes: Phascolosomatidea, Sipunculidea, Sipunculiformes
Tardigrada	Early Cambrian to Present	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxw Canvas Idakoos Bag men Homebrewing love Idakoos Tote Hobbies Real Real 5aqw0HRz Subkingdom Eumetazoa Superphylum Ecdysozoa	Classes: Heterotardigrada, Mesotardigrada, Eutardigrada
Xenoturbellida	?	Chain Small White Hand Security Round Bag Bag Bag Female Bag Bag Small Crossbody Bag qBfaEBxwSubkingdom Eumetazoa Superphylum Deuterostomia	?	2

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Tree of Life