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48 Cards in this Set

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Another word for class Polyplacophora

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