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A2 Fossils > graptolites > Flashcards

graptolites Flashcards

1
Q

graptolite PHYLUM

A

hemichordata

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2
Q

graptolite CLASS

A

graptolithinia

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3
Q

graptolite NEMA

A

thin tube extendinsion of the siclua

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4
Q

what is the possible function of the nema in a graptolite

A

attachment to floating object

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5
Q

graptolite STIPE

A

branch of the rhabdosome

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6
Q

graptolite THECA

A

indivicula cup in which ONE zooid lived

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7
Q

were graptolites colonial or solitary

A

colonial

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8
Q

graptoloid what was skkeletion made of

A

scleroprotein skeleton

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9
Q

graptoloid SICULA

A

conical tube secreted by thhe first member of the colony

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10
Q

graptoloid VIRGELLA

A

spine at the end of the sicula

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11
Q

graptoloid APERTURE

A

part where the zooid protruded through the skeleton in order to filter feed

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12
Q

PLANKTONIC graptolite where did it live?

A

water column

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13
Q

what way up was graptolite

A

appeture of sicula faced downwards

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14
Q

did graptolite attach to anything/.

A

nema attaced to floating objects + FACED UPWARDS

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15
Q

HOW DID graptolites feed

A

spiral down through water column filter feeding

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16
Q

graptolite importance as a ZONE FOSSIL

A

rapid evolution
abudnece
planktonic lifestyle
USED TO ZONE ORDOVICIAN AND SILURIAN

17
Q

graptolite range

A

Ordovician - abundant in Silurian - extinct in devonian

18
Q

How did the number of stipes change over time in GRAPLOTIES

A

early ones had up to 8 but over time they lost them

19
Q

How did attitude of stipes in gratolites change over time

A

they were pendent (downwards facing)
became horizontal
then became scandent (upwards facing)

20
Q

changes in graplotite THECAE

A

evolved from simple to complex for more efficient filter feeding

21
Q

changes in graptolite THECAE ARRANGEMENT

A

uniserial (thecae on one side of the stipe) to bi serial (both sides) then back to uniserial

22
Q

eg graptolite with 1 stipe

A

monograptus (Silurian)

23
Q

eg graptolite with 4 stipes

A

tetragraptus (Ordovician)

A2 Fossils (13 decks)

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