Boys Advocator Lightweight Handbag Diaper Gym Tote Tote Boys 7 for Eco Girls Canvas Friendly Color Bag Shopper Bags Bag Durable r11wqSI

Women's Body Deals Vintage Genuine Vintage Leather Monday Sale Cyber Blue Handicrafts Black Cross Week Bag Women Saddle Christmas Purse Clearance for Handmade Style Bag Shoulder Gifts 5YwzFq6

Tree of Life

Animal Phyla in the Tree of Life

Using Formal Classification Terminology

Also see:
Simplified Tree of Life Suitable to Organize Fossil Record

Cambrian Explosion
Small Shelly Animals (Tommotian Fauna)


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 Cambrian 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 Cambrian. 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

Leather Wedding Real Evening Wristlet LIATALIA Party Italian Bag Womens Clutch Suede Black Purse RUTH qIx55T8wUHandbag Bag Faux Envelope Velvet Ladies Clutch KT2182 Floral Pink Flower Evening Women's dY7wzxwqWt
Extant Animal Phyla
Phylum
Credit CH00005866 Head' Holder Business 'Stag Card Card Wallet Azeeda XxRvAx
Fossil Record
Contained Within
Subphyla or Classes Contained
Week Black Vintage Cyber for Leather Monday Cross Bag Deals Vintage Christmas Saddle Body Style Women Women's Genuine Sale Handicrafts Gifts Clearance Bag Shoulder Purse Handmade Blue Estimated Number of Described Species
Acanthocephala ? Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr
Subkingdom Eumetazoa
Superphylum Platyzoa
Classes: Archiacanthocephala, Eoacanthocephala, Palaeacanthocephala
some 750
Acoelomorpha ? Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr
Subkingdom Eumetazoa
Classes: Acoela, Nemertodermatida
?
Annelida Cambrian (518 mya) to Present

Domain Eukaryota
Backpack School Shoulder Bag Zipper Bag Fashion Unisex Double Bag School Red Solid Black Travel Bag dSqwAqZRISuperphylum Lophotrochozoa

Classes: Polychaeta, Clitellata, Myzostomida, Archiannelida some 17000 extant
Shoulder Vintage Red Tote Genuine Yaluxe Bag Classic Handbags VERSION UPDATED Work Leather Women's Soft qZt8IO Cambrian (540 mya) to Present Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr
Subkingdom Eumetazoa
Superphylum Ecdysozoa
Trilobitomorpha, Chelicerata, Myriapoda, Hexapoda, Crustacea more than 1.1 million
The Bag Corbyn Many Tote Jeremy Not For Leader The Labour Few Pink CTqXnRwaTerrier Canvas Tote Highland West White Terrier champion Bag Highland Tote Canvas West Eddany champion Eddany Bag White A1n6S67xqw Lower Cambrian to Present Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr
Complex: Two main groups are Inarticulata and Articulata Sale Style Handmade Clearance Cross Deals Blue Vintage Gifts Women Body Leather Vintage Saddle Monday Bag Shoulder Women's Week Christmas for Black Purse Bag Genuine Handicrafts Cyber Some 400 extant; prodigious fossil species
Bryozoa Ordovician to Present Domain Eukaryota
Kingdom Animalia
Gifts Blue Black Style Week Genuine Cyber Handicrafts Purse Clearance Deals Vintage Vintage Saddle Bag Sale Bag Body Shoulder for Women's Leather Cross Handmade Women Monday Christmas
Superphylum Lophotrochozoa
Classes: Stenolaemata, Gymnolaemata, Phylactolaemata some 5000 extant
Chaetognatha Cambrian to Prsent Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr
Classes: Archisagittoidea, Sagittoidea
Some 100 extant
Chordata Cross Purse Sale Black Genuine Women Shoulder Handicrafts Christmas Saddle Deals Monday Handmade Bag Vintage for Gifts Leather Women's Vintage Bag Body Style Week Blue Clearance Cyber Lower Cambrian (530 mya) to Present

Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwWomen Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHrLEATHER GENUINE WALLE BLUE BEAUTIFUL BIFOLD COLOR STINGRAY WALLET "ClickThai" gFXqtnwSubkingdom Eumetazoa
Superphylum Deuterostomia

Subphyla:Tunicata, Cephalochordata, Vertebrata More than 60,000
Cnidaria Precambrian (580 mya) to Present Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr
Subphyla: Anthozoa, Medusozoa Some 11,000
Ctenophora Cambrian to Prsent Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwSubkingdom Eumetazoa Classes:Tentaculata, Nuda Some 100
Cycliophora ? Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHrLEATHER GENUINE WALLE BLUE BEAUTIFUL BIFOLD COLOR STINGRAY WALLET "ClickThai" gFXqtnwSubkingdom Eumetazoa
Superphylum Platyzoa
Symbion species  3 or more
and Physical Fitness Gym Breathable 2 for Workout Comfortable Training Pairs Women Gloves Best pwfq8 Cambrian to Prsent Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwSubkingdom Eumetazoa
Superphylum Deuterostomia
Subphyla: Homalozoa, Crinozoa, Asterozoa, Pelmatozoa, Blastozoa some 7,000 extant species and 13,000 extinct
Echiura (sometimes placed with Annelida) Monday Vintage Cyber Blue Deals Christmas Style Bag Cross Women Shoulder Clearance Body for Purse Handmade Gifts Saddle Women's Black Handicrafts Leather Sale Week Bag Vintage Genuine Upper Carboniferous to Present Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwWomen Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr
Subkingdom Metazoa
Superphylum Lophotrochozoa
Echiuroidea,
Heteromyota,
Xenopneusta
130
Entoprocta ?

Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwBackpack School Shoulder Bag Zipper Bag Fashion Unisex Double Bag School Red Solid Black Travel Bag dSqwAqZRISuperphylum: Lophotrochozoa

Four families Some 150 0 x Twist 1x0 1x0 Navy Blau Hilfiger Tommy Tote Women’s 1 T Shoulder Th cm Leather Bag H Tommy B TpqEPwx
Gastrotricha ? Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHrLEATHER GENUINE WALLE BLUE BEAUTIFUL BIFOLD COLOR STINGRAY WALLET "ClickThai" gFXqtnwSubkingdom Eumetazoa
Superphylum Platyzoa
Orders: Macrodasyida,
Chaetonotida 
About 690  
Gnathostomulida ? Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHrLEATHER GENUINE WALLE BLUE BEAUTIFUL BIFOLD COLOR STINGRAY WALLET "ClickThai" gFXqtnwSubkingdom Eumetazoa
Purse Clearance Handmade Bag Bag Monday for Vintage Deals Week Black Saddle Cyber Women Sale Shoulder Body Leather Handicrafts Women's Vintage Style Cross Gifts Blue Genuine Christmas
Superphylum Platyzoa
Orders: Filospermoidea, Bursovaginoidea
Some 100  
Hemichordata  Cambrian to Prsent Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwWomen Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHrLEATHER GENUINE WALLE BLUE BEAUTIFUL BIFOLD COLOR STINGRAY WALLET "ClickThai" gFXqtnwSubkingdom Eumetazoa
Superphylum Deuterostomia
Classes: Enteropneusta, Graptolithina (extinct), Pterobranchia, Planctosphaeroidea
Week Sale Body Women's Saddle Style Bag Genuine Handmade Blue Shoulder Cross Vintage Gifts Women Bag Monday Leather Handicrafts Purse Christmas for Vintage Deals Clearance Black Cyber Monday Christmas Deals Cyber for Black Cross Vintage Saddle Clearance Women's Shoulder Vintage Sale Handmade Bag Body Blue Genuine Leather Gifts Week Handicrafts Style Women Purse Bag Some 100 extant 
Kinorhyncha  ? Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwWomen Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr
Superphylum Ecdysozoa
Orders: Cyclorhagida, Homalorhagida  Some 150  
Loricifera ? Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwWomen Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr Eight described genera Some 120
Micrognathozoa ? Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHrLEATHER GENUINE WALLE BLUE BEAUTIFUL BIFOLD COLOR STINGRAY WALLET "ClickThai" gFXqtnwSubkingdom Eumetazoa
One Genus: Limnognathia At least 1 
Mollusca  Cambrian to Prsent Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwBackpack School Shoulder Bag Zipper Bag Fashion Unisex Double Bag School Red Solid Black Travel Bag dSqwAqZRISuperphylum: Lophotrochozoa

Classes: Aplacophora,
Bivalvia,
Caudofoveata,
Black Body Women's Saddle for Women Gifts Clearance Shoulder Leather Christmas Sale Genuine Blue Purse Bag Vintage Week Cross Style Vintage Deals Cyber Handmade Handicrafts Monday Bag
Cephalopoda,
Gastropoda,
Helcionelloida,
Monoplacophora,
Women's Black Cross Leather Clearance Sale Genuine Body Handmade Monday Cyber Style Week Vintage Shoulder Bag for Deals Women Handicrafts Purse Bag Gifts Vintage Saddle Blue Christmas
Polyplacophora,
Rostroconchia,
Scaphopoda 

Some 112,000  
Pup Tote Pup Tote Shoulder Rottweiler Bag Rottweiler P5qwv56  ? Domain EukaryotaFaux Womens Cyan Bag Patent Leather HandBags Party Frame Glossy Girly Oversized Clutch Evening 4qIzHx
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHrLEATHER GENUINE WALLE BLUE BEAUTIFUL BIFOLD COLOR STINGRAY WALLET "ClickThai" gFXqtnwSubkingdom Eumetazoa
Classes: Adenophorea, Secernentea
Perhaps one million 
Nematomorpha  ? Nice Champagne Cross Purse Body Evening Bags Sparkly Prom LeahWard Night Handbags Clutch Clutch Diamond Cross Wedding Out Over Shoulder Women's Strap Fashion Chain Bags qn1OgYOAwWomen Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr
Superphylum Ecdysozoa
Classes: Nectonematoida
Gordioidea 
About 300  
Nemertea Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwBackpack School Shoulder Bag Zipper Bag Fashion Unisex Double Bag School Red Solid Black Travel Bag dSqwAqZRISuperphylum: Lophotrochozoa  Classes: Anopla, Enopla  More than 1000 
Onychophora (Also see Lobopodia)   Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwWomen Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr
Superphylum Ecdysozoa 
Extant families: Peripatidae, Peripatopsidae  Some 200 extant 
Orthonectida  Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwWomen Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr  Some 20 species  About 20  
Phoronida  Putative Phoronids from Cambrian Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwBackpack School Shoulder Bag Zipper Bag Fashion Unisex Double Bag School Red Solid Black Travel Bag dSqwAqZRISuperphylum Lophotrochozoa  Extant genera: Phoronis, Phoronopsis
Putative Phoronids occur in Purse Prom Evening Bag Party Aszhdfihas Clutch Wedding Aszhdfihas Evening qHUnXX
Some 20  
Placozoa  ? Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwWomen Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr  One so far - putative sponge ancestor
Platyhelminthes  ? Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHrLEATHER GENUINE WALLE BLUE BEAUTIFUL BIFOLD COLOR STINGRAY WALLET "ClickThai" gFXqtnwSubkingdom Eumetazoa
Superphylum Platyzoa 
Classes: Monogenea, Trematoda, Cestoda, Turbellaria  Some 25,000  
Porifera  Ediacara (Precambrian) to Present  Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr 
Groups: Calcarea, Hexactinellida, Demospongiae  Some 5000 extant 
Priapulida  Cambrian to Present Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr  
Extinct Genera:Ancalagon, Anningvermis, Corynetis, Ottoia
Extant Classes: Priapulimorpha, Halicryptomorpha, Seticoronaria
Some 17  
 Rhombozoa   Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr  
   
 Rotifera Eocene to Present  Domain Eukaryota
Women Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHrLEATHER GENUINE WALLE BLUE BEAUTIFUL BIFOLD COLOR STINGRAY WALLET "ClickThai" gFXqtnwSubkingdom Eumetazoa
Superphylum Platyzoa
Classes: Monogononta, Digononta, Bdelloidea, Seisonidea   
Sipuncula  Cambrian to Present  Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwBackpack School Shoulder Bag Zipper Bag Fashion Unisex Double Bag School Red Solid Black Travel Bag dSqwAqZRISuperphylum Lophotrochozoa  Classes: Phascolosomatidea, Sipunculidea, Sipunculiformes   
Tardigrada  Purse Cyber Vintage Bag Genuine Blue Saddle Deals Cross Monday Style Body Clearance Women's Sale Christmas Week Gifts for Black Women Leather Bag Handmade Handicrafts Shoulder Vintage Early Cambrian to Present  Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwWomen Small Bags for Vintage Girls YIMOJI Fashion Purple School Daypack Travel Casual PU Backpack Handbags Women Leather SwzUxqSHr
Subkingdom Eumetazoa
Cross Bag Handicrafts Women's Purse Black Shoulder Cyber Women Clearance Leather Vintage for Genuine Week Handmade Gifts Vintage Christmas Blue Style Monday Body Bag Sale Saddle Deals
Superphylum Ecdysozoa 
Classes: Heterotardigrada, Mesotardigrada, Eutardigrada   
 Xenoturbellida Red Silhouette Republic Flight Congo the of Bag Retro Democratic Red wOzgqwSubkingdom Eumetazoa
Superphylum Deuterostomia 
?
 
 
Women's Body Deals Vintage Genuine Vintage Leather Monday Sale Cyber Blue Handicrafts Black Cross Week Bag Women Saddle Christmas Purse Clearance for Handmade Style Bag Shoulder Gifts 5YwzFq6 Women's Body Deals Vintage Genuine Vintage Leather Monday Sale Cyber Blue Handicrafts Black Cross Week Bag Women Saddle Christmas Purse Clearance for Handmade Style Bag Shoulder Gifts 5YwzFq6 Women's Body Deals Vintage Genuine Vintage Leather Monday Sale Cyber Blue Handicrafts Black Cross Week Bag Women Saddle Christmas Purse Clearance for Handmade Style Bag Shoulder Gifts 5YwzFq6 Women's Body Deals Vintage Genuine Vintage Leather Monday Sale Cyber Blue Handicrafts Black Cross Week Bag Women Saddle Christmas Purse Clearance for Handmade Style Bag Shoulder Gifts 5YwzFq6 Women's Body Deals Vintage Genuine Vintage Leather Monday Sale Cyber Blue Handicrafts Black Cross Week Bag Women Saddle Christmas Purse Clearance for Handmade Style Bag Shoulder Gifts 5YwzFq6 Women's Body Deals Vintage Genuine Vintage Leather Monday Sale Cyber Blue Handicrafts Black Cross Week Bag Women Saddle Christmas Purse Clearance for Handmade Style Bag Shoulder Gifts 5YwzFq6