Acoelomates Flashcards
i have no internal body cavity what am i?
Acoelomate
What are the defining characteristics of phylum Nemertea
muscular eversible proboscis housed in a fluid filled, schizocoelous cavity
what phylum is a ribbon worm?
Nemertea
how many species of ribbon worms are there?
900 sp.
what is the size range for ribbon worms?
varies from a few mm’s to 27m
can you find any nemertea fossils?
no, too sqishy
how do nemertea differ from platyhelminthes?
- different systems for food capture and digestion
- gaseous exchange through the skin but nemertea have a true circulatory system
what is closely related to nemertea?
certain coelomates
what digestive system do acoelomates have?
a complete digestive system
what is a complete digestive system?
having a mouth and an anus in the anterior and posterior.
do they have a heart?
no,
define proboscis
how does the proboscis work?
where do the Gnathomidula(?) live?
define pseudocoelomate
