Test 2

Question 0

List some characteristics of Class Gastropoda.

Answer 0

1) Body usually asymmetric
2) Head region is well developed
3) Radula present
4) Large flat foot
5) Gill or lung present

Question 1

List the characteristics of Molluscs.

Answer 1

1) Mantle
2) Radula
3) Muscular foot
4) Eye
5) Lack segmentation
6) open circulatory system
7) Gill
8) Trochophore larvae - broadcast fertilization
9) largest invertebrate

Question 2

List the 3 subclasses of gastropoda and a feature that defines them.

Answer 2

Subclass Prosobranchia - gill in front
Subclass Opisthobranchia - gill in back
Subclass Pulmonata - lung

Question 3

List the characteristics of Class Bivaliva.

Answer 3

1) Marine and Freshwater
2) body enclosed in a two-lobed mantle
3) shell - two lateral valve with dorsal hinge
4) no head region
5) no tentacles
6) Mouth - palps
7) eyes
8) no radula
9) foot
10) gills

Question 4

List the types of Bivalve locomotion and an example of each.

Answer 4

Sessile (cement gland) - Oyster - crassostrea
Byssal threads (attached) - mussle - Modious
Motile - Donax
abductor muscles - scallops

Question 5

List characteristics of Class Polyplacophora.

Answer 5

1) very slow
2) elongate body
3) reduced head regions
4) bilateral symmetry
5) radula - scrapes green algae off rocks

Question 6

List the characteristics of Aplacophora.

Answer 6

1) small
2) mud bottoms
3) vermiform - worm like
4) w/o foot or mantle
5) poorly developed head region
6) radula

Question 7

List the characteristics of Class Scaphopoda.

Answer 7

1) one piece shell - open at both ends
2) foot modified for burrowing
3) head region absent
4) Radula
5) tentacles called captacula
6) eat foraminiferans

Question 8

List the characteristics of Class Cephalopoda.

Answer 8

1) all marine
2) all predators
3) ultimate in Molluscan Evolution
4) body with a shell
5) well developed head and eyes
6) foot - 8 tentacles
7) Siphon
8) superior nervous system
9) closed Circulatory system
10) radula

Question 9

list the stages of shell evolution in Cephalopoda.

Answer 9

1) Nautilus
2) Cuttlefish shell
3) Squid pen
4) Octopus w/o a shell

Question 10

List the characteristics of Hirundo.

Answer 10

1) annul
2) segmented worms
3) Circular and longitudinal muscles for moving
4) 8 seta per segment
5) Hydrostatic skeleton
6) segments called metameres

Question 11

List some characteristics of Polychaetes.

Answer 11

1) almost all hide
2) closed circulatory system
3) pair of nephridia per segment
4) cephalization

Question 12

What are the 2 subclasses of Polychaeta and their characteristics?

Answer 12

Subclass Sedentaria - ex Chaetopterus
- Filter feeders
- tube dwellers
- regional differentiation
Subclass Errantia - ex. Nereis
- primarily swimmers, crawlers, burrowing, tube-dwelling, and pelagic
- parapodia are well developed
- serial homology - segments are similar
- teeth and jaws
- head region with sensory structures - detect light

Question 13

What is a deposit feeder and some examples of each kind?

Answer 13

Direct deposit feeder - chews up the substrate
- Capitella
Indirect deposit feeder - gather food before it hits the ground
- Cirratulus
Active filter feeder - pull water through
- Chaetopterus
Passive filter feeder - just allow the water to come by
- fan worm

Question 14

Whats the difference between Epitoky and Atoky?

Answer 14

Epitoke is the posterior reproductive portion of polychaetes.
Atoke is the anterior non-reproductive portion of polychaetes.

Question 15

Whats the old and new classification of Arthropods?

Answer 15

Old	- Subphylum Trilobita
	- Subphylum Chelicerata
	- Subphylum Mandibulata
New	- Subphylum Trilobita
	- Subphylum Chelicerata
	- Subphylum Crustacea
	- Subphylum Uniramia

Question 16

List the classes, common name, genus, and something about all Classes in Crustacea.

Answer 16

Class Ostracoda - seed shrimp
	- Cypris
	- Bivalve carapace
Class Copepoda - copepods
	- Cyclops
	- TL 2
Class Branchiura - fish lice
	- Argulus
	- ectoparasites on fish
Class Cirripedia - barnacles
	- Lepus or Balanus
	- sessile with cement glands
Class Malacostraca

Question 17

List the Orders of Malacostraca, genus, and something about them.

Answer 17

Order Stomatopoda - mantid shrimp
	- Squilla
	- maxilliped 2 is subchelate
Order Decapoda - ten legs
	- Menippe
	- very old group
Order Euphausiacea - krill
	- Euphausia
	- major food item for whales
Order Mysidacea - opossum shrimp
	- TL3
Order Amphipoda - Scuds
	- Gammarus
	- subchelate
Order Isopoda - pillbugs
	- Ligia
	- dorsoventrally compressed

Question 18

List the gastropod eating strategies.

Answer 18

Herbivores
Carnivores
Parasite
Suspension feeders
Scavengers