Crustaceans - Arthropods Flashcards

1
Q

What does ‘arthropod’ mean?

A

‘Jointed foot’.

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2
Q

What are the living sub-phyla of arthropod?

A

Crustacea; Chelicerata; Myriapoda; Hexapoda.

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3
Q

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

A

Chitin.

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4
Q

What kind of skeleton do arthropods have?

A

Exoskeleton.

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5
Q

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

A

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

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6
Q

What does metamorphosis mean?

A

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.

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7
Q

When did the trilobites live?

A

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

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8
Q

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

A

Biramous – divided into 2.

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9
Q

How many antennae do crustacea have?

A

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

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10
Q

Name 3 extant classes of Crustacea, with examples

A

Malacostraca ; Branchiopoda; Maxillopoda.

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11
Q

Malacostraca

A

woodlouse

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12
Q

Branchipoda

A

tadpole

Daphnia

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13
Q

Malacostraca

A

Brine shrimp
Hermit Crab
Lobster

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14
Q

Maxillpoda examles

A

barnacles

copepod

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