Graptolites

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What is the thin extension of sicula used to attach to a floating devise called?
Nema
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The cup in which one zooid lives is known as?
Theca
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What is the opening in the skeleton which the zooid protrudes through in order to filter feed called?
Aperture
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Each individual branch of the rhabdosome is know as?
Stipe
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The spine at the end of the sicula is called?
The virgella
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Which phylum do graptolites belong to?
Hemichordata
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What class are graptolites found in?
Graptolithinia
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What is the Rhabdosome of a graptoloid?
Its skeleton
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What was the mode of life graptolites?
Planktonic
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How did graptolites feed?
Filter feed
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Between which periods did graptolites live?
Ordovician to Devonian
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Why are graptolites used as zone fossils?
Their rapid evolution, abundance and platonic mode of life
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Why is their protein-based composition important with respect to preservation?
They wouldn't be dissolved below the CCD and therefore accumulate in low-energy deep seas, where anoxic conditions prevent predation and decay
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What does biserial mean?
The thecae of graptolites are added on two sides of the stipe
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Which evolved first uniserial or biserial graptolites?
Uniserial
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A single stiped graptolite is called
Monograptus
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Scandant means?
The theca are growing vertically upwards from the sicula
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Scandant means?
The theca are growing vertically upwards from the sicula
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Other cards in this set

Card 2

Front

The cup in which one zooid lives is known as?

Back

Theca

Card 3

Front

What is the opening in the skeleton which the zooid protrudes through in order to filter feed called?

Back

Preview of the front of card 3

Card 4

Front

Each individual branch of the rhabdosome is know as?

Back

Preview of the front of card 4

Card 5

Front

The spine at the end of the sicula is called?

Back

Preview of the front of card 5
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