Flashcards
Mollusca
Cards in this deck (9)
- 1MolluscaTriploblastic
Coelomate
Protostome
Mantle, mantle cavity, gills or lungs, maybe shell, modified foot.
M, F, T
Bilateral
Radula present
Circular, diagonal and longitudinal muscles
One or two kidneys (metanephridia)
Open circulatory system - 2MonoplacophoraMultiple foot muscles
Preoral tentacles
Large, muscular foot
Single, well defined shell gland
Univalve, caplike shell.
Serial repetition of soft parts - 3PolyplacophoraMultiple foot muscles
Preoral tentacles
Large, muscular foot
Concentration of shell gland to produce solid shell.
7-8 plated shell
Mantle cavity along foot
Multiple gills - 4GastropodaMultiple foot muscles
Preoral tentacles
Large, muscular foot
Concentration of shell gland to produce solid shell
Shell coiling
Well-developed head
Dorsoventral body
Torsion- further concentration of visceral mass. - 5ProsobranchiaMarine or freshwater snail.
One or two gills in mantle cavity.
Operculum usually present.
Torsion results in anterior mantle cavity.
Mostly dioecious. - 6OpisthobranchiaSea slugs, sea hares, nudibranchs (naked gills).
Mostly marine.
Reduction/loss of mantle cavity/shell common.
Torsion as larvae, detorsion as adults.
Benthic crawling, pelagic swimming/drifting.
Often spectacularly coloured.
Hermaphroditic.
'Horns' (rhinophore) which detect chemicals and hunt for food. - 7PulmonataMarine (mostly intertidal), freshwater and terrestrial (garden snails and slugs).
Gills absent.
Mantle forms lung, breathe through pneumostome.
Dioecious and hermaphrodite, often with well developed courtship.
No operculum.
Shell present or absent, coiled or conical. - 8BivalviaLoss of radula
Multiple foot muscles
Preoral tentacles
Large, muscular foot
Single, well-defined shell gland.
Nervous system decentralized.
Head reduced
Spatulate foot
Mantle cavity around the body
Bivalve shell
Lateral compression of the body - 9CephalapodaMultiple foot muscles
Preoral tentacles
Large, muscular foot
Concentration of shell gland to produce solid shell
Shell coiling
Well-developed head
Dorsoventral body
Siphuncle
Beak-like jaws
Arms/tentacles and siphon
Closed circulatory shell
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- Zool221 Flashcards on Mollusca, created by drwhoe on 07/06/2015.
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- drwhoe
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