Chordata - Revision history

Gauravm at 18:05, 2 February 2011

2011-02-02T18:05:25Z

Gauravm at 18:02, 2 February 2011

2011-02-02T18:02:48Z

Gauravm at 18:02, 2 February 2011

2011-02-02T18:02:29Z

Gauravm at 16:56, 2 February 2011

2011-02-02T16:56:20Z

New page

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 {{Taxon description
-|Taxon level=Division
+|Taxon level=Division/Phylum
 |Taxon name=Chordata
 |Taxon neighbors=Hemichordata, Echinodermata, Xenoturbellida

@@ Line 2: / Line 2: @@
 |Taxon level=Division
 |Taxon name=Chordata
-|Taxon neighbors=Hemichordata, Echinodermata
+|Taxon neighbors=Hemichordata, Echinodermata, Xenoturbellida
 |ref taxon neighbors=Wikipedia
 |Taxon details=The phylum ''Chordata'' consists of three subphyla: ''Urochordata'', represented by tunicates; ''Cephalochordata'', represented by lancelets; and ''Craniata'', which includes Vertebrata. Chordates are monophyletic, meaning that ''Chordata'' contains all and only the descendants of a single common ancestor which is itself a chordate, and that craniates' nearest relatives are cephalochordates.

← Older revision		Revision as of 18:02, 2 February 2011
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−	{{Taxon description}}	+	{{Taxon description
		+	\|Taxon level=Division
		+	\|Taxon name=Chordata
		+	\|Taxon neighbors=Hemichordata, Echinodermata
		+	\|ref taxon neighbors=Wikipedia
		+	\|Taxon details=The phylum ''Chordata'' consists of three subphyla: ''Urochordata'', represented by tunicates; ''Cephalochordata'', represented by lancelets; and ''Craniata'', which includes Vertebrata. Chordates are monophyletic, meaning that ''Chordata'' contains all and only the descendants of a single common ancestor which is itself a chordate, and that craniates' nearest relatives are cephalochordates.
		+
		+	The Chordates arose from a more general superphylum '''Deuterostomia''', which consists of Chordata, Hemichordata,Echinodermata and Xenoturbellida. The Deuterostomes split from Protostomes ~550 mya in the Cambrian era. It is supposed that Chordates arose in the Mid-Cambrian period, however there is controversy regarding that. The controversy arises mainly due to the fact that fossils of early chordates are very rare.
		+	\|ref taxon details=Wikipedia article Origins section
		+	\|Taxon morphology details=Chordates form a phylum of creatures that are based on a bilateral body plan, and is defined by having at some stage in their lives all of the following: 1) A notochord, 2) A dorsal neural tube 3) Pharyngeal slits 4) A muscular tail that extends backwards behind the anus and 5) An endostyle
		+	\|ref taxon morphology details=Wikipedia
		+	}}
		+	{{Reference web
		+	\|refkeyword=Wikipedia
		+	\|title1=Wikipedia entry
		+	\|url=http://en.wikipedia.org/wiki/Chordate
		+	\|year=2011
		+	\|month=02
		+	\|date=02
		+	}}