Mollusca Flashcards
What type of symmetry do molluscs have?
bilateral or asymmetrical
Protostome, Deuterostome, or Acoel?
Protostome
What kind of gut?
complete, regionally specialized
What excretory structures?
Metanephridia
What kind of coelomic space?
reduced coelom, pericardium around heart
What kind of circulatory system?
Open, three chambered heart
What are synapomorphies of Mollusca?
Mantle with mantle cavity, mantle with shell glands, radula, ventral muscular foot, three chambered “true” heart
What classes of Mollusca did we investigate?
Monoplacophora (one shell fossils), Polyplacophora (chitons), Scaphopoda (tusk shells), Gastropoda (Prosobranchia, Opisthobranchia, Pulmonata), Bivalvia, Cephlopoda
What structures are present in the mantle cavity?
Ctenidia, anus, gonopores, nephridiopores, osphradia (chemoreceptor)
What structure covers the opening to a snail’s shell when it retracts?
Operculum
What specialized structure(s) are used in digestion?
Crystalline style and sac to spin food into food thread, gastric shield ground by style to produce amylase, radula to rasp food from prey (mechanical digestion)
How is food sorted in the stomach?
cilia
