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GL2017 > Trilobites > Flashcards

Trilobites Flashcards

1
Q

Name palaeozoic creatures

A

-Graptolites
-Crinoids
-Coral
-Ammonoid
-Trilobites
-Eurypterid and fish

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2
Q
A

Crinoid

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3
Q
A

Graptolites

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4
Q
A

Rugose Coral

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5
Q
A

Scleractinian Coral Acropora

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6
Q
A

Scleractinian Coral Bellum Woodie

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7
Q
A

Scleractinian Coral Isastrea Conybeari

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8
Q
A

Tabulate Coral

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9
Q
A

Ammonoid

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10
Q
A

Trilobite

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11
Q
A

Eurypterid

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12
Q

Where did Trilobites live?

A

Exclusively marine

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13
Q

What is the temporal range of Trilobites ?

A

Early Cambrian to late Permian

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14
Q

When were trilobites at their peak ?

A

lower paleozoic

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15
Q

When did all but one order of trilobites die out?

A

During the Devonian

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16
Q

When was the Trilobite mass extinction?

A

End of the Permian

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17
Q
A

Trilobite morphology Cephalon

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18
Q
A

Trilobite morphology Eyes

19
Q
A

Trilobite morphology Fracture

20
Q
A

Trilobite morphology Glabella

21
Q
A

Trilobite morphology Pygidium

22
Q
A

Trilobite morphology Thoracic Segment

23
Q
A

Trilobite morphology Thorax

24
Q

Name the type of trilobite eye

A

Holochroal

25
Q

Name the type of trilobite eye

A

Schizocroal

26
Q

Did all trilobites have eyes?

A

No

27
Q

Name an example of trilobites without eyes

A

Agnostid Trilobites

28
Q

Do all arthropods shed their carapaces (shells)

A

Yes, arthropod exoskeletons are inflexible and so, to grow larger, arthropods must moult

29
Q

give the meaning of ‘Ecdysis’

A

The process of an arthropod moulting its exoskeleton

30
Q

Most Trilobites where ‘benthic’ what does this mean

A

The occurred at the bottom of a body of water, ie.most trilobites crawled on the seabed, some swam.

31
Q

How did trilobites prevent themselves from sinking into the seabed?

A

They spread their weight by using spines, whilst some ploughed through the soft sediment.

32
Q

Why would some trilobites burry themselves completely in the seabed?

A

To find a source of food (tasty sea worms)

33
Q

what is meant by, trilobites were ‘pelagic swimmers’

A

They swam in shallow waters, usually the continual shelf were life is abundant

34
Q

What is the meaning of ‘Ectomorphs’

A

Environment related shapes

35
Q

Palagic trilobites: give some examples of why this trilobite can be considered an ectomorph

A

-Palagic trilobites: these trilobites are swimmers, they have big eyes, they are predators with flexible bodies, its important they can see their prey.

36
Q

Illaenimorph trilobites: give some examples of why this trilobite can be considered an ectomorph

A

-Illaenimorph trilobites: these trilobites are simple, they burrow into the mud and hide in sediment therefore no need for complex body.

37
Q

Marginal cephalic spines: give some examples of why this trilobite can be considered an ectomorph

A

-Marginal cephalic spines: these trilobites are well suited to muddy habitats with their spines allowing them to dig around.

38
Q

Miniaturization: give some examples of why this trilobite can be considered an ectomorph

A

-Miniaturization: these trilobites lived in deep water therefore they didn’t need eyes and could have small bodies allowing them to need less food

39
Q

Describe a trilobite’s functional morphology

A

-Spiny, big to located eyes on
-Streamline
-Smooth (not fully understood)

40
Q

When were the 3 phases of trilobite evolution ?

A

Phase 1: The Cambrian

phase 2: The Early Ordovician, The Silurian and the Devonian.

Phase 3: The Carboniferous - Permian extinction.

41
Q

Describe phase 1 of trilobite evolution

A

The Cambrian:

-Abudant
-Mostly spiny
-Big trilobites with small pygidia
-Small trilobites with big pygidia

examples: agnostus, paradoxides and olenellus

42
Q

Describe phase 2 of trilobite evolution

A

The Early Ordovician, The Silurian and the Devonian.

-Streamlined
-Symmetrical
-experimentation with eyes
- Typically like Ogygiocaris and Phacops
-Different morphologies and eyes

-Benthic forms: burrows, grasers, scavengers and predators.

-pelagic forms: blind or enlarged eyes.

-two little extinction events

43
Q

Describe phase 3 of trilobite evolution

A

Phase 3: The Carboniferous -permian

partial recovery from the extinction, only one group left, the proetids.
-Small
-Streamlined
-Symmetrical
-Spotty
-Slightly spiny

44
Q

Describe phase 4 of trilobite evolution

A

Mass extinction at the end of the Permian extinction.

GL2017 (8 decks)

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