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Flashcards in Molluscs Deck (47):
1

Belongs to what type of protostomes

lophotrochozoan protostomes

2

What does the simplest body plan consist of? (3 things)

1. Foot OR head-foot portion
2. Visceral mass portion
(3. Shell)

3

contains feeding, cephalic sensory, and locomotor organs

Head-foot region

4

contains digestive, circulatory, respiratory, and reproductive organs

Visceral mass

5

Mantle Cavity does what

Two folds of skin form protective mantle or pallium
Space between mantle and body wall is the mantle cavity
Mantle cavity houses the gills (ctenidia) or a lung

6

Posterior to mouth is the chief what?

locomotor organ, the foot

7

Buccal Mass consists of what two things? And which one is unique to molluscs

Radula and Odontophore

8

Protruding, rasping, tongue-like organ
firm ribbon of teeth arranged in rows
Serves as a conveyor belt to move particles to digestive tract

Radula

9

cartilage-like supportive structure

Odontophore

10

What does the foot function as

Functions in attachment to substratum or for locomotion or for a combination of both.

11

What is a mantle and what does it secrete

a sheath tissue on each side of the body
Secretes the shell when present

12

Houses the gills or lungs that develop from the mantle
Exposed surface of the mantle also functions in gaseous

Mantle cavity

13

In aquatic molluscs what flows in and what flows out

Continuous flow of water brings in oxygen and food, and flushes out wastes

14

The products which have been excreted go to?

the empty mate cavity

15

What is the respiratory organ in a mollusc called?

ctenidia

16

What are the two functions of the Ciliary?

provide continuous water current in/out of cavity and modify for filter feeding bivalves

17

The shell is secreted by what?

the mantle

18

What are the three layers of the shell?

Periostracum, Middle prismatic layer and Inner nacreous layer


19

Which shell layer is Composed of conchiolin, a tanned protein (=formation of crosslinking between proteins).

Periostracum

20

What consists of the open system?

pumping heart, blood vessels, and blood sinuses

21

most cephalopods have a heart, vessels, and capillaries
is what type of system

closed

22

Excretory system-
Most molluscs have a pair of what

kidneys or metanephridia

23

What are the four systems in a mollusk

Circulatory system, Excretory system, Nervous system
and sense organs

24

Gametes are exchanged how?

both internal fertilization and external fertilization

25

most mollusks are dioecious but some can be?

hermaphroditic

26

Reproduction- trochophore larva do what?

may feed, catching small plankton in prototroch,

27

Which one has a short life and which one has a long one: planktotrophic or lecithotrophic

Planl- long
lec- short

28

Veliger larva develops from what?

In bivalves, most often develop into a second, free-swimming, larval stage

29

Veliger larva modification in some freshwater bivalves: fertilization is what?

usually internal

30

Glochidium larva

microscopic non-swimming shelled larva
- initially “ectoparasitic” (10 – 30 days) on fish
- attaches to fish gills, encyst and feed by phagocytosis

31

Class Polyplacophora: Chitons key features

Somewhat flattened with 7- 8 dorsal plates, Most prefer rocky intertidal surfaces

32

Which class consists of Mussels, clams, scallops, oysters, and shipworms

Class Bivalvia

33

Bivalves lack what

lack a head, radula, or other aspects of cephalization
Most are marine

34

What is the most diverse class? with over 70,000 living species

Class Gastropoda

35

Class Gastropoda has what?

Snails, limpets, slugs, whelks, conches, periwinkles, sea slugs, sea hares, and sea butterflies

36

Gastropod Shells are?

Conch shells, One-piece univalve, coiled or uncoiled

37

Left handed and Right handed Gastropod Shells are called what?

Left handed- sinistral
Right handed-dextral

38

Adults lack a shell but can still store

toxins from their prey

39

Squids, octopuses, nautiluses, devilfish, and cuttlefish
All marine predators belongs to what class?

Class Cephalopoda

40

What is the largest invertebrate?

The giant squid

41

Which class has sexes which are separate ?

Class Cephalopoda

42

What has the largest nerve fibers in the animal kingdom? and Can learn by reward and punishment, and by observation of others

Squids

43

Which brain is the largest of any invertebrate?

Cephalopod brain

44

The sense organs are well developed but often times colour blind: which class

Cephalopoda

45

Cephalopods communicate using what?

chemical and visual signals to communicate

46

cells in the skin that contain pigment granules can also expand and cause it to change colour pattern

Chromatophores

47

Ink sac empties into rectum and secretes what when alarmed?

sepia