Porifera

From Palaeos.org

Jump to: navigation, search
(template, heading and graohic)
Line 5: Line 5:
<br>
<br>
-
[[Image:Elephant-ear-sponge.jpg|thumb|center|An orange Elephant Ear sponge, ''Agelas clathrodes'' ([[Demospongiae]], [[Ceractinomorpha]], Agelasida, Agelasidae) at the Florida Keys National Maritime Sanctuary.]]
+
[[Image:Elephant-ear-sponge.jpg|thumb|center|An orange Elephant Ear sponge, ''Agelas clathrodes'' ([[Demospongiae]], [[HAGGER!!!]], Agelasida, Agelasidae) at the Florida Keys National Maritime Sanctuary.]]
The most primitive form of multicellular animal life, it is thought that sponges evolved independently of [[metazoa]]n animal life, or else of [[Eumetazoa|higher metazoa]]. A recent alternative theory, suggested through [[molecular phylogeny]] is that they represent a paraphyletic grade of [[basal]] metazoa.  Regardless of their actual phylogenetic relationship, the Porifera in many respects they are still little more than colonial [[Choanoflagellata|choanoflagellate]] protozoa. Over 5000 recent species are known, and many more fossil species. All are benthic, sessile, suspension-feeders which inhabited a wide variety of exclusively marine environments, from the early [[Cambrian]] to the present day.
The most primitive form of multicellular animal life, it is thought that sponges evolved independently of [[metazoa]]n animal life, or else of [[Eumetazoa|higher metazoa]]. A recent alternative theory, suggested through [[molecular phylogeny]] is that they represent a paraphyletic grade of [[basal]] metazoa.  Regardless of their actual phylogenetic relationship, the Porifera in many respects they are still little more than colonial [[Choanoflagellata|choanoflagellate]] protozoa. Over 5000 recent species are known, and many more fossil species. All are benthic, sessile, suspension-feeders which inhabited a wide variety of exclusively marine environments, from the early [[Cambrian]] to the present day.

Revision as of 21:41, 8 December 2007

Personal tools