Lecture 22 Flashcards

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1
Q

Phylum Mollusca traits?

A

Calcium carbonate shell
Snails, clams squids and shit
muscular ventral foot for movement
Not segmented

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2
Q

Mantle of Mollusca?

A

Thin layer of tissue that secretes shell

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3
Q

visceral mass?

A

Contains mollusca organs, above its foot

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4
Q

Radula?

A

strap-like rasping organ (mouthparts)

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5
Q

Gills?

A

gas exchange and sometimes feeding

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6
Q

___ circulatory system?

A

Open with blood not in vessels and a reduced coelom

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7
Q

Trochophore?

A

planktonic larva

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8
Q

Gatropoda class?

A
Snails
Glide along large foot
Torsion (anal opening over head)
Most are marine
Use lung for gas exchange (Mantle cavity)
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9
Q

Nudibranch

A

Shell less gastropods

Eat cnidarians and use their nematocysts

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10
Q

Class bivalvia?

A

Clams, oysters, mussels, scallops
Mostly marine
Feed by filtering through gills
Most dont move

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11
Q

Class Cephalopoda?

A
Squid, cuttlefish, octopi 
No external shells
Long tentacles along mouth
Predatory (beak)
Maternal care
Do not have trochophore larvae.
good vision
intelligent
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12
Q

Siphon? (cephalopoda)

A

jet propulsion

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13
Q

Only type of mollusc with?

A

Closed circulatory system

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