_____ allows better burrowing efficiency. Has a _____ circulatory system and a _____ digestive system. Except in ____, coelom is filled with hydrostatic fluid.
Metamerism
Closed
Complete
Leeches
Primary purpose of clitellum?
Secretes muscus during reproduction
Function of the calciferious glands?
Secretes calcium ions into gut, regulates acid-base balance of body fluids.
Function of gizzard?
Grinds food into tiny pieces
Leeches secrete ____
hirudin (anesthetic)
Function of the seminal receptacle?
Receives and stores sperm from another earthworm.
______ consists of sedentary feeders and active predators.
Polychaeta
Which of the 3 classes have a trochophore class and which have no larva stage?
Polychaeta
Oligochata
Difference between freshwater oligochaetes and terrestrial oligochaetes (earthworms)?
Freshwater oligochaetes are usually smaller and more mobile, and have better sense organs.