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37 Cards in this Set
- Front
- Back
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what kind of coelum do mulluscs have
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eucoelomate
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what is unique about the molluscs coelom
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it is greatly reduced
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how many species of molluscs are there: extinct and extant
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50,000 extant, 35,000 extinct
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the three trophic roles that molluscs occupy
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herbivores, detritiovores, carnivores
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what are the three types of feeding methods used by molluscs?
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-filter feeding
-grazing/scraping -hunting - |
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most molluscs have these to breathe
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gills
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the circulatory system of all molluscs except for the cehplapods is
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open
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what is a veliger
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this is a development stage found in some molluscs, has foot, shell, and mantle
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what is a trochophore
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a development stage that is simplified and is characterized by cilia for movement
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this class of molluscs most resembles the H.A.M. model
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the chitons
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what are the three major classes of molluscs?
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-bivalvia
-gastropodia -cehplopoda |
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what are some common gastropods
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snails, slugs, whelks, sea slugs, sea hares
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how do gastropods move?
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progressive muscular movement of the foot, ciliary waves
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operculum?
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the protective shield some gastropods use to seal there shell
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gastropdods go thru this process to fit better in there shell
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torsion
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planispiral
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the coiling of a gastropds shell in a long cone
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conispiral
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the coiling of a gastropods shell into a spiral
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radula?
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the scraping teeth found in gastropods, used for scraping
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gastropods reproduction?
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hermaphroditic (monecious)
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instead of a penis some gastropods do this
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stab there mate with a hormone dart
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after fertilization of gastropods occur what happens, and what kind of development occurs
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eggs are laid, direct development
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name the three main types of gastropods
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-prosobranchs
-ophistobranchs -pulmonates |
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this gastropod type has
-gills -operculum -mostly marine -includes all the showy snails |
prosobranchs
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this gastropod type has
-detorted shells or no shells -include swimming forms -and include the sea hares |
ophistobranchs
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this gastropod type has
- a lung instead of gills -and include the freshwater and terrestrial snails and slugs |
pulmonates
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what are some common bivalvia?
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clams, oysters, mussels, limpets, scallops
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bivalves are mostly?
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marinein
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in bivalves the two shells are connected by?
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a hinge ligament
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umbo?
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the point from which a bivalve shells grows outward
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how do bivalves move
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a foot drags them forward
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bivalves have these types of siphons
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-incurrent
-excurrent |
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what kind of muscle pulls a bivalves shell together
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abductor
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how do bivalves get oxygen
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gas exchange through the mantle surface and ctenidia
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what form of feeding do all bivalves use?
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filter feeding
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describe the digestive anatomy of a bivalve
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mouth>stomach>intestine>anus>suprabranchial chamber>excurrent siphon
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name some common types of cephalopoda
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-nautiloids
-cutlefish -squid -octopi |
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what about cephalopoda anatomyseperates them from the other molluscs
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closed circulatory system
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