Introduction To Protostomes Flashcards
What are the key characteristics of the protostome nervous system
Anterior brain around the entry to the gut
Ventral nervous system
What are the groups within the protostomes
Lophotrochozoa
Ecdysozoa
Arrow worms
What is spiralia
A group containing arrow worms and lophotrochozoans
The zygote undergoes spiral cleavage during early development
What is the key characteristic of animals in the ecdysozoa
They molt (ecdysis)
What is a lophophore
A horseshoe like feeding structure containing ciliates tendrils around the mouth. Used for filter feeding
What is a trochophore
A type of free living larva characterised by its bands of cilia used for locomotion
What are some key orders within lophotrochozoans
Platyhelminthes (flatworms, both the lophophore and trochophore have been lost)
Rotifera (extremely radiation resistant)
Bryozoans (microscopic moss animals)
Ciliophora (found in the mouthparts of lobsters)
Nemertea (ribbon worms)
Branchiopods (made up of two shells)
Annelida (segmented worms)
Mollusca (clams, cephalopods, gastropods)
What are the orders of ecdysozoa
Nematodes (unsegmented worms)
Nematomorpha (horsehair worms)
Tardigrades (water bears)
Onycophorans (silkworms)
Arthropods (insects and arachnids)
