Phylum: Nematoda

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Jennifer Franco's picture

under the major group Ecdysozoa

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What characteristic is responsible for the branching off of the roundworms from earlier animals?

pseudocoelomate body plan

What type of digestive system is seen in these animals?

alimentary canal

What level of organization do these organisms demonstrate?

organ-system level

How many tissue layers do these organisms have?

triploblastic

When do they show up in the evolutionary history?

Precambrian

Type of excretory system?

Waste exits the excretory pores

Why is it considered a "false cavity"?

It is not lined with mesoderm

Where are they found?

worldwide

What phylum is it in and what is the common name?

phylum: Nematoda
roundworms

Front image: 

A. cuticle
B. epidermis
C. pseudoocoel
D. longitudinal muscles
E. dorsal nerve cord
F. ventral nerve cord
G. intestines

Front image: