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Bio Exam 3 > Mollusks and Annelids > Flashcards

Mollusks and Annelids Flashcards

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Biology 101 flashcards
1
Q

What animals are in Phylum Molusca?

A

snails, slugs, clams, scallops, oysters, squid, and octopuses

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2
Q

Phylogenetically, mollusks share a common ancestor with __________, and both exhibit ________ ________.

Also both phyla include representatives with a __________-_________ larval stage called a ____________.

A

annelids, spiral cleavage

free-swimming, trochophore

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3
Q

What is the basic body plan of a Chitons (Mollusk)?

A
  • muscular foot

- gills

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4
Q

What is the basic body plan of a Gastropods-snail (mollusk)?

A
  • snails don’t have gills

- shell, skin is highly vascularized like a lung

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5
Q

What is the basic body plan of a Cephalopods (mollusk)?

A
  • radula

- 8 legs, 2 tenticls for moving foot

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6
Q

What is a polyplacophora: chitons?

A

inter-tidal marine organisms that rasp algae from rocks

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7
Q

Class Gastropoda includes the animals…?

A

snails, slugs, nudibranchs

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8
Q

What is Torsion in Snail Shells?

A
  • side view of the snail, poops out near its head

- viscera in snails is rotated 180 degrees

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9
Q

What is coiling in Snail Shells doing for it?

A

-gives the animal a better sense of gravity is stronger with it coiled.

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10
Q

what are the characteristics of Class Bivalvia?

A
  • most are sedentary filter feeders that depend on ciliary action of gills to bring in food.
  • no radula and little cephalization
  • movement via the muscular foot
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11
Q

What are the characteristics of Class Cephalopoda?

A
  • active marine predators with closed circulatory systems(the others don’t have this!)
  • All the wiring is behind the eye, retina first and is more highly evolved that our eye.
  • NO larval stages
  • A siphon is used for jet propulsion
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12
Q

What is the most ancient (chambered mollusk)?

A

Nautilus

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13
Q

What has a very sophisticated brain? and what kind of shell does it have?/

A

Cuttlefish

intermediate shell

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14
Q

What has a slightly smaller shell than a cuttlefish, and what specialization does it have?

A

Squid

helps in expelling water

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15
Q

What has no shell, and is very smart learning capacity to open a crab jar? What else an its body do?

A

Octopus

Change color

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16
Q

What did the true coelom open the door for?

A

complexity of design-blood vessels and organ protection

17
Q

What does segmentation allow the body to be able to do?

A
  • septa between segments allow for an improved hydrostatic skeleton.
  • circular and longitudinal muscles (longitudinal are the length of the body and circular can then scrunch up)
  • opportunity for specialization(head region, and other sections of body)
18
Q

What kind of circulatory system does an Annelida have?

A

Closed circulatory system

19
Q

How does gas exchange through the an Annelida?

A

through the bodies surface

20
Q

Class Polychaeta are what type of water livers?

A

Marine

21
Q

Class Polychaeta have what kind of head and organs?

A

differentiated head

specialized sense organs

22
Q

Class Polychaeta have chaetae=…?

A

setae- in budles on parapodia

23
Q

Is a Polychaeta monoecious or dioecious?

The early larvae is a _______?

A

dioecious

trochophore

24
Q

In Class Clitellata is Cephalization pronounced?

A

No

25
Q

What is unique to Clitellata? which is what?

A

Clitellum-series of swollen segments used during reproduction

26
Q

What class are earthworms in?

A

Clitellata

27
Q

What are earthworms like?

A

most are freshwater or terrestrial scavengers

28
Q

Earthworms have _______, but no _______?

A

Chaetae, parapodia

29
Q

What are the 3 other animals besides earthworms that are in Class Clitellata?

A
  1. Oligochaetes
  2. Hirundinea
  3. Leaches
30
Q

Where do leaches mostly live?

A

freshwater

31
Q

What kind of eaters are leaches?

A

carnivorous and parasitic

32
Q

What do the leaches lack?

A

parapodia and chaetae

33
Q

Mollusks are _________ only to arthropods in terms of _________?

A

second, diversity

Bio Exam 3 (5 decks)

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