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
defining characteristics of Phylum Rotifera
define eutelic
multiple nuclei not seperated by cell walls is called?
syncicial
define the phylum Acanthocephala
define the phylum Acanthocephala
