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48 Cards in this Set
- Front
- Back
Another word for class Polyplacophora |
Chitons
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The five classes of Mollusca we're concerned with?
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-Polyplacophora
-Gastropoda -Cephalopoda -Bivalvia -Scaphopoda |
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Label/What is it?
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a Hypothetical Ancestral Mollusca
(a.k.a. HAM) |
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Label
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outer layer of Molluscan shells?
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periostracum
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Label/What is it?
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Trochophore larva
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Label
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Mollusca are _______ symmetrical animals.
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bilaterally
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Label/Class?
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Polyplacophora - (chitons)
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Label/Class?
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Polyplacophora
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Label/Class?
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Polyplacophora
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chemosensory organ of Mollusca?
Where is it located? |
osphradium
posteriorly |
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Label/Class?
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What class do clams belong to?
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Bivalvia
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Label
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Elevated portion of a bivalve shell that indicates the origin from which the mantle began to produce the shell?
Which was is it oriented? |
Umbo
Pointed anteriorly. |
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Foot of a bivalve is located on the _______ surface
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ventral
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Incurrent siphon is always located _____.
Excurrent siphon is always located ______. |
ventrally
dorsally |
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The pallial line marks the former attachment of the ______ to the shell.
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mantle
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Label/Class
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Bivalvia
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What are the two pairs of gills (inner/outer) each called?
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Demibranchs
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3 Functions of the gills in Bivaliva
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Reproduction
Respiration Food gathering |
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Label/Class?
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Bivalvia
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Label/Class?
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Bivalvia
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The water from the excurrent siphon is the outflow of water from each of the four ________________.
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suprabranchial chambers
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Label/Class?
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Cephalopoda
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Label/Class?
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Cephalopoda
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In the squid, what structure is the remnant of the HAM shell?
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the Pen
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The heart of squid (cephalopoda) involved in pulmonary circulation
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branchial heart
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The heart of squid (cephalopoda) involved in systemic circulation?
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systemic heart
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How many arms surround the mouth of the squids?
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10 (8 of similar length + 2 tentacles)
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A modified tentacle for transferring sperm in squid?
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hectocotylus
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Label/Class?
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Cephalopoda (Particularly squid)
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The axis around which the whorls are wound in a Gastropoda?
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The Columella
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If the opening of a Gastropoda shell is situated on the right when facing you, it is _________ coiled.
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Dextrally
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If the opening of a Gastropoda shell is situated on the left when facing you, it is _________ coiled.
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Sinestrally
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The radula is applied to the ______, which helps the radula to contract.
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odontophore
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Label/Class?
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Gastropoda
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The twisting of the mantle cavity and its contents 180 degrees from the posterior of the animal to the anterior (Gastropoda)
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Torsion
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Define detorsion and in what animals it has occurred.
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Torsion has taken place and then reverted 90 degrees. (slugs, freshwater snails, terrestrial snails)
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How can we tell that detorsion has taken place?
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The opening of the shell is on the right side of the animal.
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Opening through which air can enter the mantle cavity of a snail (gastropoda)?
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Pneumostome
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Be careful! With detorsion, the _______ ends up ___________.
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Right lung... on the left side
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Label/Class?
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Gastropoda
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3 Major groups of snails? (Class?)
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Pulmonates (Gastropoda)
Opisthobranchs Prosobranchs |
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Characteristics of Pulmonate snails?
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Land snails, slugs; freshwater snails
No gills; "lung" |
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Characteristics of Opisthobranchs? (Class?)
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(Gastropoda)
-Mostly marine; shallow water -Usually 2 pair of tentacles; shell reduced or absent -Sea slugs, sea hares; all monoecious |
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Characteristics of Prosobranchs? (Class?)
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(Gastropoda)
-Most marine snails;1pr of tentacles -Mantle cavity anterior as result of torsion -Frequently have operculum |