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Animals > Molluscs > Flashcards

Molluscs Flashcards

1
Q

Belongs to what type of protostomes

A

lophotrochozoan protostomes

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2
Q

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

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

contains feeding, cephalic sensory, and locomotor organs

A

Head-foot region

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4
Q

contains digestive, circulatory, respiratory, and reproductive organs

A

Visceral mass

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5
Q

Mantle Cavity does what

A

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

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6
Q

Posterior to mouth is the chief what?

A

locomotor organ, the foot

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7
Q

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

A

Radula and Odontophore

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8
Q

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

A

Radula

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9
Q

cartilage-like supportive structure

A

Odontophore

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10
Q

What does the foot function as

A

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

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11
Q

What is a mantle and what does it secrete

A

a sheath tissue on each side of the body

Secretes the shell when present

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12
Q

Houses the gills or lungs that develop from the mantle

Exposed surface of the mantle also functions in gaseous

A

Mantle cavity

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13
Q

In aquatic molluscs what flows in and what flows out

A

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

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14
Q

The products which have been excreted go to?

A

the empty mate cavity

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15
Q

What is the respiratory organ in a mollusc called?

A

ctenidia

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16
Q

What are the two functions of the Ciliary?

A

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

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17
Q

The shell is secreted by what?

A

the mantle

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18
Q

What are the three layers of the shell?

A

Periostracum, Middle prismatic layer and Inner nacreous layer

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19
Q

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

A

Periostracum

20
Q

What consists of the open system?

A

pumping heart, blood vessels, and blood sinuses

21
Q

most cephalopods have a heart, vessels, and capillaries

is what type of system

A

closed

22
Q

Excretory system-

Most molluscs have a pair of what

A

kidneys or metanephridia

23
Q

What are the four systems in a mollusk

A

Circulatory system, Excretory system, Nervous system

and sense organs

24
Q

Gametes are exchanged how?

A

both internal fertilization and external fertilization

25
Q

most mollusks are dioecious but some can be?

A

hermaphroditic

26
Q

Reproduction- trochophore larva do what?

A

may feed, catching small plankton in prototroch,

27
Q

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

A

Planl- long

lec- short

28
Q

Veliger larva develops from what?

A

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

29
Q

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

A

usually internal

30
Q

Glochidium larva

A

microscopic non-swimming shelled larva

  • initially “ectoparasitic” (10 – 30 days) on fish
  • attaches to fish gills, encyst and feed by phagocytosis
31
Q

Class Polyplacophora: Chitons key features

A

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

32
Q

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

A

Class Bivalvia

33
Q

Bivalves lack what

A

lack a head, radula, or other aspects of cephalization

Most are marine

34
Q

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

A

Class Gastropoda

35
Q

Class Gastropoda has what?

A

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

36
Q

Gastropod Shells are?

A

Conch shells, One-piece univalve, coiled or uncoiled

37
Q

Left handed and Right handed Gastropod Shells are called what?

A

Left handed- sinistral

Right handed-dextral

38
Q

Adults lack a shell but can still store

A

toxins from their prey

39
Q

Squids, octopuses, nautiluses, devilfish, and cuttlefish

All marine predators belongs to what class?

A

Class Cephalopoda

40
Q

What is the largest invertebrate?

A

The giant squid

41
Q

Which class has sexes which are separate ?

A

Class Cephalopoda

42
Q

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

A

Squids

43
Q

Which brain is the largest of any invertebrate?

A

Cephalopod brain

44
Q

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

A

Cephalopoda

45
Q

Cephalopods communicate using what?

A

chemical and visual signals to communicate

46
Q

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

A

Chromatophores

47
Q

Ink sac empties into rectum and secretes what when alarmed?

A

sepia

Animals (9 decks)

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