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Trilobites

written by: daspletosaurus

Trilobites roamed the seas hundreds of millions of years ago and were some of the most successful creatures to have ever lived.

Question 1:

How many orders of trilobite are there?

9
15
10
3

Question 2:

What order of trilobite was the only one to survive the Devonian mass extinction?

Phacopida
Proetida
None of these
Lichida

Question 3:

Approximately how many species of trilobite existed over the duration of the Paleozoic?

12,000
18,000
17,000
9,000

Question 4:

Trilobites developed one of the first complex visual systems.

False
True

Question 5:

Not all trilobites had eyes.

True
False

Question 6:

What genus and species did the largest complete trilobite fossil ever found belong to?

Isotelus brachycephalus
Isotelus maximus
Isotelus rex
None of these

Question 7:

The pygidium refers to what section of a trilobite's body?

The tail
The thorax
The head
None of these

Question 8:

Which of the following is believed to be an ancestor of the trilobites?

Spriggina
Onega
None of these
Trichophycus

Question 9:

What is the technical term for the head of a trilobite? (place mouse pointer over ? icon to view hints or answer requirements)

Question 10:

Did some trilobites filter-feed as a means of obtaining food?

Yes
No

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