Lab 4

Question 1

Which of the following Arthropod subphyla went extinct at the end of the Permian era, 252 million years ago?

Answer 1

Trilobita

Question 2

Approximately how many species of crustaceans have been described?

Answer 2

65,000 to 70,000

Question 3

Sea spiders belong to which Arthropod class?

Answer 3

Pycnogonida

Question 4

The joints of a crustacean can move on bearings called:

Answer 4

Condyles

Question 5

Which of these crustaceans belong to the Maxillopoda?

Barnacles, Copepods, Ostracods

Answer 5

All of them

Question 6

Which of these crustaceans DOES NOT belong to the Malacostraca? Euphausiids, Isopods, Amphipods, Branchiopods

Answer 6

Branchiopods

Question 7

True or False: Crustaceans are dioecious

Answer 7

True

Question 8

Which of the following larval forms occur in the lobster lifecycle?

Answer 8

Phyllosoma

Question 9

Nauplius larvae can develop into what crustacean larval form?

Answer 9

Cypris, Zoea, Phyllosoma

Question 10

Arthropods have the following key features

Answer 10

• An extensive hemocoel and reduced true coelom
• No circular muscle blocks
• No motile cilia

Question 11

The ligaments that expand the lobster heart following a contraction are:

Answer 11

Alary ligaments

Question 12

Digestion in the lobster occurs in the:

Answer 12

Digestive gland

Question 13

The cardiac stomach of the lobster contains:

Answer 13

The gastric mill

Question 14

The sieve press in the pyloric stomach of the lobster controls

Answer 14

The size of particles entering the digestive system

Question 15

Before flowing through the gills, hemolymph (blood) collects in what structure in a lobster:

Answer 15

Infrabranchial sinus

Question 16

Which of these is not a gill type found in lobsters?Pleurobranchia, Podobranchia, Arthrobranchia, Sternobranchia

Answer 16

Sternobranchia

Question 17

Some crustaceans have an axillary blood pumping vessel in the head region called a:

Answer 17

Cor frontale

Question 18

Water flow through the branchial chamber is generally in which direction?

Answer 18

Posterior to Anterior

Question 19

The structures that move water through the branchial chamber of a lobster are?

Answer 19

Gill bailers

Question 20

Which of these crustacean groups DOES NOT have suspension feeding in any of its species.
Euphausiids, Anomuran crabs, Copepods

Answer 20

They all have suspension feeding

Question 21

Which of these crustaceans are NOT benthic

Adult galatheid crabs, Euphausiids, Thecostraca, Cephalocarida

Answer 21

Euphausiids

Question 22

The difference between a male and female lobster can be determined externally from:

Answer 22

The presence of an additional claw on the 5th the pereopod

Question 23

The pore located on the antennae of the lobster is what?

Answer 23

A nephridiopore

Question 24

Excretion of nitrogenous wastes in the lobster primarily occurs:

Answer 24

Via the antennal glands and across the gills

Question 25

Place in order starting from outside the animal to inside, the layers of the crustacean cuticle:

Answer 25

Epicuticle, exocuticle, calcified endocuticle, uncalcified endocuticle, membranous layer, epidermis