brachiopods Flashcards

1
Q

what is the defining feature of a brachipod

A

two unequal sized valves

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2
Q

Brachiopod RANGE

A

cambrian - now

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3
Q

brachiopod dominant era?

A

palaeozoic

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4
Q

brachiodpod PHYLUM

A

brachiopoda

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5
Q

modern e.gs of Brachiopod

A

common muscle, oyster

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6
Q

what are most Brachiopods shells made up of

A

chitin + calcium phosphate

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7
Q

is there symmetry in brachiopod

A

yes, 1 line of bilateral symettry

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8
Q

what is the pedicle in brachiopod

A

fleshy stalk which attaches the brachiopod to the substrate

can align the brachiopod with current

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9
Q

what are the two brachiopod valves

A

PEDICLE AND BRACHIAL

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10
Q

what is the pedicle va;ve in a brachipod

A

the bottom valve, contails pedicle and pedicle formen (hole for pedicle)

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11
Q

do all brachiopods have a pedicle?

A

no

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12
Q

which brachiopod valve is usually smallest

A

brachial valves

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13
Q

what is the umbo on a brachiopod

A

the area marking point of first growth

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14
Q

what are brachiopod deltidial plates

A

covers a triangular area below the foramen

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15
Q

what are brachiopod growth lines

A

represent new layers of shell as the animal grows

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16
Q

what are brachiopod diductor muscles

A

for opening valves

17
Q

what is brachipod ‘cardinal process’

A

part of brachial valve where muscle is attached

18
Q

what is the brachiopod brachidium

A

lophophore support

19
Q

what is a (brachiopod) lophophore

A

a fluid filled set of of fillaments lined with cilia

these cilia generate currents to trap food particles

20
Q

how to brachiopods feed?

A

filter feeding (using lophophore)

21
Q

which muscles CONTRACT to open braichiopod

A

diductor

22
Q

what is the brachiopod commisure

A

line between valves