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Protostome

protostome

An organism in which the blastopore develops into the mouth and the coelom arises by schizocely and whose embryo has determinate cleavage


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Re: Protostome/ Deuterostome

apparently, its a matter of debate. im trying to find a clear-cut answer, or at least information pointing in a direction of evidence for either, but im finding a lot of contradictory information. I would have thought protostomia was ancestral, but Im reading that the latest molecular studies are pu...

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by nikita
Mon Oct 13, 2008 6:24 pm
 
Forum: General Discussion
Topic: Protostome/ Deuterostome
Replies: 4
Views: 5541

Protostome/ Deuterostome

... is the more ancestral trait. I am thinking of possible essay answers and I am thinking of the Lophophorates and how they are a mixture of protostome and deuterostome traits. Apparently, protostomia is more derived, but why? any help would be appreciated.

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by nikita
Mon Oct 13, 2008 1:24 am
 
Forum: General Discussion
Topic: Protostome/ Deuterostome
Replies: 4
Views: 5541

invertebrate to vertebrate fossils out of order?

... a difficult one, and intermediate forms have and still exist in the form of lancelets and tunicates. More ground-breaking was the transition from protostome to deuterostome.

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by alextemplet
Thu Oct 09, 2008 11:18 pm
 
Forum: Evolution
Topic: invertebrate to vertebrate fossils out of order?
Replies: 2
Views: 3123

body cavities

Your lecturer has ignored acoelomate (which, since there's no cavities, is a valid thing to ignore) and split the coelomates along your protostome-deuterostome line, based on how the mesoderm forms. So you may not be as confused as you thought you were. As a true indicator of groupings, only ...

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by Darby
Mon Apr 24, 2006 4:19 pm
 
Forum: Zoology Discussion
Topic: body cavities
Replies: 1
Views: 2086

embryonic development

i read my text book n it said protostome and deuterostome are eucoelomate.... but how abt acoelomate n pseudocoelomate embryo? ((i read some websites, they said acoelomate and pseudo- are protostome))<--if so, then how abt schizocoelomate ...

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by hiro
Thu Apr 20, 2006 2:39 pm
 
Forum: Physiology
Topic: embryonic development
Replies: 2
Views: 5073
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