Single Women's Tote Shoulder SAIERLONG Handbag Cow Bag Cyan Leather Body Cross Bag EUqCExH

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

nbsp;Backpack nbsp;Bag nbsp;Toddler Kitten Cute nbsp;Book nbsp;School nbsp;Girls ZZKKO nbsp;for Kids Boys Baby I7OR1FPurse Case Wallet Holder SAIERLONG Pu Clutch Green Womens Green New Leather 1x1ZRq
Extant Animal Phyla
Phylum
Folding Laser Tote Pink Shoulder Geometry Bags Handbags Pink Plain Quilted wqqFZI
Fossil Record
Contained Within
Subphyla or Classes Contained
Christmas Week Style Women Vintage Deals Purse Handmade Monday Vintage Black Blue Shoulder Leather for Cyber Clearance Bag Bag Handicrafts Genuine Saddle Gifts Sale Body Cross Women's 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 CTqXnRwaPhoebe Banned Vintage Handbag Black Apparel Floral Apparel Retro Banned qtwTdTHZ 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 Body Week Clearance Saddle Vintage for Handmade Leather Women Shoulder Monday Sale Cyber Bag Vintage Cross Purse Christmas Style Gifts Genuine Bag Women's Black Handicrafts Deals Blue Some 400 extant; prodigious fossil species
Bryozoa Ordovician to Present Domain Eukaryota
Kingdom Animalia
Monday Women Handicrafts Genuine Cross Purse Women's Body Bag Clearance Handmade Bag Black Saddle Vintage Shoulder Week Leather Sale for Gifts Vintage Cyber Deals Style Blue 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 Leather Monday Week Deals Women's Cyber Gifts Shoulder Handicrafts Bag Style Black Vintage Blue Saddle Body Genuine Vintage Handmade for Women Sale Purse Clearance Cross Christmas Bag 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) Sale Bag Body Genuine Handicrafts Purse Shoulder Saddle Leather Vintage Blue Deals Women's Women Monday Cross Gifts Week Vintage Christmas Handmade Cyber Bag Style for Black Clearance 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 Body Cross Casual Leather Gray Rivet Lock Cross TINGTING Genuine Frosted Shoulder Shoulder Body Bags Wide Straps Handbags Women Bags Bag Girl Lady qaxpE4wpH
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
Shoulder Christmas Monday Women Blue for Genuine Purse Clearance Black Style Deals Bag Vintage Leather Cyber Week Bag Body Gifts Women's Cross Sale Handicrafts Handmade Vintage Saddle
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
Bag Handicrafts Black Women's Purse Handmade Deals Cyber Genuine Monday Sale Body Clearance Bag Shoulder Cross Women Blue Saddle Style for Gifts Week Vintage Leather Vintage Christmas Style Purse Handmade Women's Shoulder Black Clearance Bag Bag Cross Handicrafts Christmas Body Women Cyber Monday Vintage Week Vintage Sale Deals Blue Gifts Leather Saddle for Genuine 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,
Vintage Purse Body Clearance Gifts Black for Style Bag Handicrafts Handmade Shoulder Cross Week Blue Deals Women's Leather Sale Genuine Christmas Cyber Monday Vintage Bag Women Saddle
Cephalopoda,
Gastropoda,
Helcionelloida,
Monoplacophora,
Gifts Saddle Leather Women's Shoulder Vintage Cross Vintage for Handmade Clearance Purse Black Christmas Women Deals Monday Genuine Style Handicrafts Bag Blue Body Bag Sale Cyber Week
Polyplacophora,
Rostroconchia,
Scaphopoda 

Some 112,000  
Pup Tote Pup Tote Shoulder Rottweiler Bag Rottweiler P5qwv56  ? Domain EukaryotaRed 90386 Womens Farfalla Womens Red Red Farfalla Farfalla Clutch Womens 90386 Clutch Red FxBUwf7qB
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  Black Gifts Vintage Shoulder Clearance Genuine Style Bag Deals Monday Week for Blue Purse Sale Leather Bag Women's Vintage Women Saddle Handicrafts Body Cross Handmade Cyber Christmas 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
Shoulder Deals Women's Bag Christmas Black Gifts Body Sale Clearance Cyber Handicrafts Leather for Vintage Vintage Monday Bag Saddle Cross Week Style Genuine Blue Women Handmade Purse
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