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Phylum
Mollusca(5 Classes) Policemen censor gals in scant bikinis!
Polyplacophora – Many plates on a foot
Cephalopoda – Head foot
Gastropoda – Stomach
Scaphopoda – Tusk shell
Bivalvia – Hatchet foot
foot
Chitons radula, 8 plates
Class Polyplacophora
MantleAnus Gills in
mantle cavity
Radula in mouth
Head
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 tentacles (2) & arms are derived from the Gastropod foot
Class Gastropoda - snails, conchs torsion/coiling, radula, operculum.
Subclass Prosobranchia –pointed shells!
Aquatic GILLS
Subclass Pulmonata – rounded shells!
Land snails and slugs LUNG
Dextral
Detorsion…
If it looks strange, chances are itssomething from Class Gastropoda
Subclass PulmonataSlug
Egg Sac
Nudibranch
Class Gastropoda
‘POP’
Subclass Prosobranchia- aquatic snails (“shells”)
Subclass Opisthobranchia-Marine
-Nudibranchs / Sea slugs / Sea hares
-mantle cavity & shell reduced or absent
Subclass Pulmonata-Terrestrial Slugs and terrestrial snails
Class Scaphopoda - “tusk shells”
Currency for Wampum Indians. Head in sand. Respire through mantle (no gills.) Captacula for feeding on foramniferans,
Class Bivalvia or Pelecypoda - clams, scallops etc.filter feeders, bivalved shells…… dissection
D
VAP
Name of oldest part?
Class Bivalvia or Pelecypoda - clams, scallops etc.filter feeders, bivalved shells…… dissection
D
VAP
Umbo
Path of water (O2)
Mouth
VentricleBulbus 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 musclesArea of gastric
& /digestive glands