Plathyhelminthes - ANS-Dorsoventrally flattened, unsegmented acoelomates;
gastrovascular cavity or no digestive tract
Rotifera (rotifers) - ANS-Pseudocoelomates with alimentary canal (digestive tube with
mouth and anus); jaws (trophi) in pharynx; head with ciliated crown
Mollusca (clams, snails, squids) - ANS-Coielomates with three main body parts
(muscular foot, visceral mass, mantle); coelom reduced; most have hard shell made of
calcium carbonate
Annelida (segmented worms) - ANS-Coelomates with segmented body wall and internal
organs (except digestive tract, which is unsegmented)
Nematoda (roundworms) - ANS-Cylindrical, unsegmented pseudocoelomates with
tapered ends; no circulator system; undergo ecdysis
Arthopoda (crustaceans, insects, spiders) - ANS-Coelomates with segmented body,
jointed appendages, and exoskeleton made of protein and chitin
Echinodermata (sea stars, sea urchins) - ANS-Coelomates with bilaterally symmetrical
larvae and five-part body organiziation as adults; unique water vascular system;
endoskeleton
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Hkane. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £6.57. You're not tied to anything after your purchase.
