Quiz 5 - Molluscs Flashcards

1
Q

rasping structure around in the oral cavity of nearly all molluscs. Absent in bivalves.

A

radula

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2
Q

different classes of phylum molluscs (5)

A

polyplacophora, gastropoda, Scaphopoda, bivalvia, cephalopoda

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3
Q

example of phylum molluscs class polyplacophora

A

chitons

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4
Q

example of class phylum molluscs Gastropoda

A

snail and slugs

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5
Q

subclasses of Gastropoda

A

Prosobranchia, Opisthobranchia, Pulmonata

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6
Q

examples of phylum molluscs class Gastropoda subclass Prosobranchia

A

shelled aquatic snails

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7
Q

examples of phylum molluscs class Gastropoda subclass Opisthobranchia

A

sea hares and most nudibranchs (slugs)

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8
Q

examples of phylum molluscs class Gastropoda subclass pulmonata

A

land snails and slugs

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9
Q

examples of phylum molluscs class Scaphopoda

A

tusk/tooth shells

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10
Q

examples of phylum molluscs class bivalvia

A

clams, oysters, scallops, etc.

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11
Q

examples of phylum molluscs class Cephalopoda

A

octopus, squid, cuttlefish, and nautilus

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12
Q

another name for gills

A

ctenidia

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13
Q

surrounded on either side of the chiton foot, contains ctenidia

A

pallial groove on chiton

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14
Q

largest class of molluscs

A

Gastropoda

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15
Q

conspicuous opening of the Gastropoda shell

A

aperture

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16
Q

ancestral condition of coiling in gastropods, single plane coiling

A

planispiral

17
Q

gastropoda shell coiling in a spiral in three dimensions, allows for gastropods to achieve larger sizes because weight could be shifted off the snails back and less danger of tipping over

A

conispiral

18
Q

left-handed gastropoda shells

A

sinistral

19
Q

right-handed gastropoda shells

A

dextral

20
Q

predators tend to prefer what kind of shell handedness

A

right-handed

21
Q

this has the function of bringing in water and directing the flow of water over the ctenidia in gastropods

A

siphon

22
Q

what subclass has a hard covering that lies on over the aperture when a snail retracts into the shell and what’s its called

A

Prosobranchia

Operculum

23
Q

beautiful molluscs that swim gracefully

A

Opisthobranchia (sea hares and nudibranch)

24
Q

members of this mollusc class/subclass lost their ctenidia and have a vascular mantle section that acts as a lung.

A
Class gastropoda
Subclass Pulmonata
25
Q

molluscs with elongated, open ended shells that are produced

A

Class Scaphopoda

26
Q

Molluscs that are deposit feeders

A

Class Scaphopoda

27
Q

smallest part of a class bivalvia shell and the oldest

A

umbo

28
Q

umbo is dorsal/ventral?

A

Dorsal