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Flashcards in Invertabrate Biology Deck (83)
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1

What are the Classes located in Phylum Mollusca?

Class->
Bivalva
Gastropoda
Cephalopda
Polyplacophora

2

What animals are located in Class Bivalva?

Clams, oysters, Scallops, and Mussels

3

What does moluska mean?

Soft body

4

What are the 3 parts of a mollusk body?

Visceral mass
Mantle
Foot

5

What is most of a mollusk shell made of?

Calcium carbonate

6

How are the two types of the shell opened and closed in mollusks?

By adductor muscles

7

What part of the mollusk body is used for burrowing?

the foot

8

How is water circulated through mollusks?

by siphons

9

How do mussels attach themselves to intertidal structures?

by strong byssal threads

10

What are Geoducks?

Giant Clams

11

What do scallops posses that other shellfish do not?

Eyes with a lens and retina

12

What is the Periostracum layer on an oyster shell?

Outer protien layer

13

What is the Prismatic layer on an oyster shell?

Middle calcium carbonate CaCO3
-and the thickest layer

14

What is the nacreous layer on an oyster shell?

The 'mother of pearl' layer

15

Where do pearls form in an oyster?

Between nacreous layer and mantle

16

What is the umbo?

The oldest part of the shell->The 'hinge'

17

What animals are in class Gastropoda?

Snails and Slugs

18

Which has a shell?
Snails or slugs?

Snails have a shell, slugs do not

19

What do snails and slugs have for grazing on grass?

A radula

20

Do aquatic snails have seperate sexes?

yes

21

Do terrestrial snails have seperate sexes?

no, they are hermaphrodidic

22

When do snails retreat into their shell?

during dry periods

23

What is the unfortunate consequence of snails undergoing torsion during larvae development?

The anus ends up above the head

24

What modified radula does the cone snail possess?

A harpoon with a poisonious gland

25

What modified radula does the Moon snail possess?

Can drill holes into clam shells

26

What is a nudibranch?

A sea slug that doesnt have a shell

27

In sexual reproductio, where are sperm and eggs deposited?

Via cloaca conjugation

28

What animals belong in Class Cephalopoda?

Squid, Octopus, and Nautilus

29

What type of nervous system do cephalopods possess?

A highly developed nervous system with vertabrae like eyes

30

What is the largest invertabrates?

Giant squid