brachiopods Flashcards
what is the defining feature of a brachipod
two unequal sized valves
Brachiopod RANGE
cambrian - now
brachiopod dominant era?
palaeozoic
brachiodpod PHYLUM
brachiopoda
modern e.gs of Brachiopod
common muscle, oyster
what are most Brachiopods shells made up of
chitin + calcium phosphate
is there symmetry in brachiopod
yes, 1 line of bilateral symettry
what is the pedicle in brachiopod
fleshy stalk which attaches the brachiopod to the substrate
can align the brachiopod with current
what are the two brachiopod valves
PEDICLE AND BRACHIAL
what is the pedicle va;ve in a brachipod
the bottom valve, contails pedicle and pedicle formen (hole for pedicle)
do all brachiopods have a pedicle?
no
which brachiopod valve is usually smallest
brachial valves
what is the umbo on a brachiopod
the area marking point of first growth
what are brachiopod deltidial plates
covers a triangular area below the foramen
what are brachiopod growth lines
represent new layers of shell as the animal grows
what are brachiopod diductor muscles
for opening valves
what is brachipod ‘cardinal process’
part of brachial valve where muscle is attached
what is the brachiopod brachidium
lophophore support
what is a (brachiopod) lophophore
a fluid filled set of of fillaments lined with cilia
these cilia generate currents to trap food particles
how to brachiopods feed?
filter feeding (using lophophore)
which muscles CONTRACT to open braichiopod
diductor
what is the brachiopod commisure
line between valves
