Crustaceans - Arthropods

Question 1

What does ‘arthropod’ mean?

Answer 1

‘Jointed foot’.

Question 2

What are the living sub-phyla of arthropod?

Answer 2

Crustacea; Chelicerata; Myriapoda; Hexapoda.

Question 3

What is the main organic component of arthropod cuticle, besides protein?

Answer 3

Chitin.

Question 4

What kind of skeleton do arthropods have?

Answer 4

Exoskeleton.

Question 5

Why do crustacea have larger and faster-beating hearts than insects?

Answer 5

Because crustacea rely on blood to deliver oxygen from gills to body tissues. Insects deliver oxygen through tracheae, air-filled tubes.

Question 6

What does metamorphosis mean?

Answer 6

Literally ‘change in form’. In arthropods, it refers to a change in body form from one phase of the life cycle to another – such as nauplius to zoea larva to adult crab; or caterpillar to chrysalis to butterfly.

Question 7

When did the trilobites live?

Answer 7

First in the Cambrian; extinct soon after start of Palaeozoic.

Question 8

What kind of limbs do crustacea have (which distinguishes them from other Arthropods)?

Answer 8

Biramous – divided into 2.

Question 9

How many antennae do crustacea have?

Answer 9

4 (2 pairs) – unlike insects, who have 1 pair. In crustacea, each antenna is biramous.

Question 10

Name 3 extant classes of Crustacea, with examples

Answer 10

Malacostraca ; Branchiopoda; Maxillopoda.

Question 11

Malacostraca

Answer 11

woodlouse

Question 12

Branchipoda

Answer 12

tadpole

Daphnia

Question 13

Malacostraca

Answer 13

Brine shrimp
Hermit Crab
Lobster

Question 14

Maxillpoda examles

Answer 14

barnacles

copepod