phylum mollusca (5 classes) polyplaco phora – many plates on a foot cephalopoda – head foot
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Phylum Mollusca (5 Classes) Polyplaco phora – Many plates on a foot Cephalopoda – Head foot Gastropoda – Stomach Scaphopoda – Tusk shell Bi valvia – Hatchet foot foot. Pol icemen Ce nsor Ga ls in Sc ant Bi kinis!. Typical questions for Mollusca. - PowerPoint PPT PresentationTRANSCRIPT
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Phylum Mollusca(5 Classes)
Polyplacophora – Many plates on a foot
Cephalopoda – Head footGastropoda – Stomach Scaphopoda – Tusk shellBivalvia – Hatchet foot
foot
Policemen Censor Gals in Scant Bikinis!
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Typical questions for Mollusca
•How many of these specimens posses a radula?•Which ones are filter feeders?•Which have undergone torsion? Detorsion?•Name the main function of the mantle?•Name a class used for currency•Which specimens have lungs? (Just have think of which live on land vs. in water……)
•Name the oldest part of a univalve shell? Bivalve?
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Answers…maybe• Gastropods, Cephalopoda, Mono-, A- &
Polyplacophora • Bivalvia (Scaphopoda….have a captacula)• Gastropods Opisthobranchia (sea hares & sea
slugs) and the land slugs of the Pulmonata• Mantle secretes the shell • Scaphopoda• Pulmonata – their name gives this away• Apex for Univalve, Umbo for bivalve but often the
terms are used interchangeably
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Chitons radula, 8 platesClass Polyplacophora
MantleAnus Gills in
mantle cavity
Radula in mouth
Head
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Class Cephalopoda - Octopuses, Squid, Nautilus,Cuttlefish…beak, pen, ink sac, chromatophores,jet propulsion……….dissection.
Tentacles (2) & arms are all derived from the gastropod foot
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Gastropoda WORDS TO KNOW:
snails, conchs, torsion, coiling, radula, operculum & egg sac
Aquatic – marine. Generally having thick pointed shells, spines, & many have opercula.
Subclass Pulmonata Aquatic – freshwater. Shells are thin, rounded, with no spines, ridges or opercula.
Apex
Subclass Prosobranchia
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…….it issomething from Class Gastropoda
(…or your roommate!)
Subclass PulmonataSlug
Subclass Opisthobranchia Nudibranch
Detorsion…
If something looks strange, chances are….
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Class Gastropoda ‘POP’
Subclass Prosobranchia - Aquatic snails (“shells”) - Have gills
Subclass Opisthobranchia- Marine - Have gills
- Nudibranchs / Sea slugs / Sea hares- Mantle cavity & shell reduced or absent
Subclass Pulmonata- Terrestrial Slugs and terrestrial snails- Have lungs
Sinistral Dextral
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Class Scaphopoda - “tusk shells”
Wampum Indian currency. ‘Head’ in sand. Respire through mantle (no gills.) Captacula for feeding on (capturing) foramniferans
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ClaBivalvia or Pelecypoda - clams, scallops etc. filter feeders, bivalved shells…… dissection
D
VA P
Name of oldest part?
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ClaBivalvia or Pelecypoda - clams, scallops etc. filter feeders, bivalved shells…… dissection
D
VA P
Umbo
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Mouth Labial palps
VentricleAuricleIntestin
e
FootMantle
Excurrent & Incurrent siphon (-hairs & papullae)
Gills or ctenidium – Each = 2 demibranchs
Anterior (Umbo)
Posterior
Dorsal (hinge)
Ventral
Percardial cavity
Visceral Mass
Stomach = Area of gastric & /digestive glands
Adductor muscle
Visceral mass – gonads & digestive tissues
Foot Mantle
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Quiz Mollusca• How many classes posses a radula?
– 3 of the 5 classes (Cephalopoda, Polyplacophora & Gastropoda)• How many are filter feeders?
– 1 of the 5 classes (Bivalvia)• What feeding structure do Scaphopoda use?
A/ pedicellaria B/captacula or C/Aristotle’s Lantern?– B - to catch foramnifera