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Animal_diversity_October_2007

Most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion , about 542 million years ago. Contents 1 Etymology 2 Characteristics 2.1 Structure 2.2 Reproduction and development 2.3 Food and energy sourcing 3 Origin and fossil

Tyriq's faves print that page

Triceratops_AMNH_01

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Ecdysozoa print that page

Centipede

The Ecdysozoa (pronounced /ˌɛkdɪsɵˈzoʊ.ə/ ) are a grouping of protostome animals, [ 1 ] including the Arthropoda ( insects , chelicerata , crustaceans , and myriapods ), Nematoda , and several smaller phyla . They were first defined by Aguinaldo et al. in 1997, based mainly on trees

The Ancestor's Tale print that page

AncestorsTale2

The narrative is structured as a pilgrimage , with all modern animals following their own path through history to the origin of life . Humans meet their evolutionary cousins at rendezvous points along the way, the points at which the lineage diverged. At each point Dawkins attempts to infer

Urmetazoan print that page

Anning_plesiosaur

have been put forward, and discriminating between them is difficult because the relationships of animal phyla are not completely resolved. Animals are generally considered to have evolved from a flagellated eukaryote. Their closest known living relatives are the choanoflagellates , collared

Cambrian explosion print that page

Opabinia_BW2

The Cambrian explosion or Cambrian radiation was the relatively rapid appearance, over a period of many million years, of most major Phyla around 530 million years ago , as found in the fossil record . [ 1 ] [ 2 ] This was accompanied by a major diversification of other organisms, including

Bryozoa print that page

Haeckel_Bryozoa

Ectoprocta (Nitsche, 1869 [ 4 ] ) The Bryozoa , also known as Ectoprocta or commonly as moss animals , are a phylum of aquatic invertebrate animals . Typically about 0.5 millimetres (0.020 in) long, they are filter feeders that sieve food particles out of the water using a retractable

Brachiopod print that page

PlatystrophiaOrdovician

pedicle projects from an opening in the hinge or from a hole in the larger valve, attaching the animal to the seabed but clear of silt that would obstruct the opening. Brachiopods have a mantle that secretes and lines the shell, and encloses the internal organs. The body occupies typically

Annelid print that page

Nerr0328

Class Polychaeta ( paraphyletic ?) Class Clitellata (see below )     Oligochaeta - earthworms , etc.     Branchiobdellida     Hirudinea - leeches Class Myzostomida Class Archiannelida ( polyphyletic ) The annelids (also called "ringed worms"), formally called Annelida

Cnidaria print that page

Sea_nettles

Cnidarians were for a long time grouped with Ctenophores in the phylum Coelenterata , but increasing awareness of their differences caused them to be placed in separate phyla. Cnidarians are classified into four main groups: sessile Anthozoa ( sea anemones , corals , sea pens ); swimming