Phylum Annelida Flashcards
What is the phylum of segmented worms?
Annelida
Is the body segmented? and what is the form
Yes, body is segmented (metameric) and vermiform
What is the symmetry?
bilaterally symmetrical
What is the coelom like?
Well developed coelom
What is the skeleton?
coelomic fluid functions as hydrostatic skeleton
Does it have setae?
paired, epidermal setae often present
What is the circulatory system like?
closed circulatory system
What is the digestive system like?
complete digestive system
How does respiratory gas exchange work?
respiratory gas exchange through skin, gills, or parapodia
How is the excretory system?
excretory system with a pair of nephridia for each segment
What is the nervous system like?
Nervous system with a double ventral nerve cord with ganglia
What is the sensory system like?
tactile organs, taste buds, statocysts, photoreceptors, and eyes with lenses in some
What is the reproduction like?
Monoecious or dioecious with trochophore larva
What are the characteristics of the class Polychaeta?
mostly marine; head with yes on tentacles; parapodia bear numerous setae; monoecious or dioecious; development frequently involves a trochophore larval stage
What are the characteristics of the class Clitellata?
No parapodia; few or no setae; clitellum functions in cocoon formation; monoecious with direct development