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Published byChloe Burns Modified over 9 years ago
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Phylum Mollusca (5 Classes) Scaphopoda Cephalopoda – Head foot Pelecypoda (Bivalvia) – Hatchet foot Polyplacophora – Many plates on a foot Gastropoda – Stomach foot
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Class Scaphopoda - “tusk shells” Wampum Indians, head in the sand, captacula, eat foramniferans, respire through mantle as have no gills.
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Class Cephalopoda - Octopuses, Squid, Nautilus, Cuttlefish…beak, pen, ink sac, chromatophores, jet propulsion……….dissection. I see Spot very well I swim faster than Spot I make make spots all over me in order to hide! My arms are derived from the Gastropod foot
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Class Bivalvia or Pelecypoda - clams, scallops etc. filter feeders, bivalved shells…… dissection D V A P Name of oldest part?
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Class Bivalvia or Pelecypoda - clams, scallops etc. filter feeders, bivalved shells…… dissection D V A P Umbo
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Mouth Ventricle Bulbus arteriosus Heart Foot Gills Mantle Excurrent & Incurrent siphons Schematic Diagram of a Clam Dissection Gills or ctenidium – Each = 2 demibranchs Anterior Posterior Dorsal Ventral Auricle Visceral Mass Adductor muscles
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Chitons radula, 8 plates Class Polyplacophora Mantle Anus Gills in mantle cavity Radula in mouth Head
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Class Gastropoda - snails, conchs torsion/coiling, radula, operculum. Subclass Prosobranchia – pointed shells! Aquatic GILLS Subclass Pulmonata – rounded shells! Land snails and slugs LUNG Dextral
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Detorsion If it looks strange, chances are its something from Class Gastropoda Subclass Pulmonata Slug Subclass Opisthobranchia Nudibranch Egg Sac
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