Phylum Mollusca (5 Classes) Scaphopoda Cephalopoda – Head foot Pelecypoda (Bivalvia) – Hatchet foot Polyplacophora – Many plates on a foot Gastropoda – Stomach foot
ClassScaphopoda- “tusk shells” Wampum Indians, head in the sand, captacula, eat foramniferans, respire through mantle as have no gills.
I see Spot very well I make make spots all over me in order to hide! I swim faster than Spot My arms are derived from the Gastropod foot ClassCephalopoda - Octopuses, Squid, Nautilus, Cuttlefish…beak, pen, ink sac, chromatophores, jet propulsion……….dissection.
Name of oldest part? D P A V ClassBivalviaor Pelecypoda- clams, scallops etc. filter feeders, bivalved shells…… dissection
Umbo D P A V ClassBivalviaorPelecypoda- clams, scallops etc. filter feeders, bivalved shells…… dissection
Dorsal Ventricle Heart Auricle Bulbus arteriosus Anterior Adductor muscles Gills Posterior Mouth Visceral Mass Excurrent & Incurrent siphons Foot Gills or ctenidium – Each = 2 demibranchs Mantle Ventral Schematic Diagram of a Clam Dissection
Anus Gills in mantle cavity Mantle Radula in mouth Head Chitons radula, 8 plates ClassPolyplacophora
Subclass Prosobranchia – pointed shells! Aquatic GILLS Dextral Subclass Pulmonata – rounded shells! Land snails and slugs LUNG ClassGastropoda- snails, conchs torsion/coiling, radula, operculum.
Subclass Pulmonata Slug SubclassOpisthobranchia Nudibranch Egg Sac Detorsion If it looks strange, chances are its something from Class Gastropoda