BIO 124 Lecture Notes - Lecture 13: Clitellata, Annelid, Tube Feet
21 Mar 2016
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Lophophorata: 3 closely related phyla, all possess: True coelom has continuation of finger like projections. U shaped alimentary canal: phylum phoronida. Tube-dwelling marine worms - extract material from environment to form tube. Has ability to move and form a new tube. Wide geographic range (only not found in polar regions) Simple blood system produce colorless blood: phylum bryozoa. High in numbers is paleozoic and mesozoic: live as colonies of distinct units. Secrete gelatinous material that are similar within a colony. Little black spots are cells that form the next generation (reproduction) Phylum mollusca: coelomates full digestive systems, soft body with calcium containing shell, bilateral symmetry, bivalves clams and oysters. Have hinged shells that are divided into two parts: class polyplacophora. Chitons marine mollusks with a shell composed of 8 separate plates. Easy for them to move over rocky surfaces bc shell is in 8 separate plates allows for some flexibility. Have a foot and a tongue like structure (radula)
