Mollusks - How the nervous system works Flashcards Preview

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Flashcards in Mollusks - How the nervous system works Deck (91)
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1

how many species of Mollusca are there?

more than 100,000

2

Mollusca is the ____ largest animal group after arthropods

2nd

3

How are Mollusca diverse?

they are diverse in their
- morphology
- modes of nutrition
- reproduction
- response to environment

4

how are Mollusca symmetrical?

bilaterally

5

Mollusca are ___plastic

triploblastic

6

what are the four major groups of Mollusca

1. polyplacophora
2. gastropoda
3. bivalvia
4. cephalopoda

7

what does the mantle cavity of Mollusca contain?

gills

8

For land living organisms the mantle cavity is ...

an extended space for surface oxygen exchange

9

The front end of the intestine is known as the

radula

10

the Polyplacophora is known as the

"bearer of many plates"

11

how many overlapping plates does the Polyplacophora have?

eight!

12

Polyplacophora are...

omnivorous

13

where are the gills located in Polyplacophora

in the mantle grooves?

14

Polyplacophora are able to withstand ___ ____

low oxygen

15

Bivalvia means ...

"two valves"

16

Bivalvia have a reduction of

head

17

the mantle cavity of Bivalvia is modified by

siphons

18

how do Bivalvia get oxygen?

by using their gills

19

what else do the gills of Bivalvia do?

filter food

20

are Bivalvia sessile or mobile?

sessile

21

what kind of feeders are Bivalvia

filter feeders

22

Siphons are extensions of

posterior mantle

23

In Siphons water flows in the __ ___ and then across the ___ that act as ___ for food

mantle cavity ; gills ; filters

24

there are two exits/entries in Siphons

one water is sucked in and the other water is squished out

25

what is the most diverse group of mollusks?

Gastropoda

26

how many species of Gastropoda are there?

85,000

27

what kind of eaters are Gastropoda?

herbivores, predators, scavengers

28

what kind of fertlization do Gastropoda do?

both internal and external

29

Gastropoda are either _______ or hermaphroditic but can produce only sperm or eggs at any given time

dioecious

30

Dioecious means

separate sexes