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Echinocyamidae
Echinocyamidae
is a family of
sand dollars
. They are found mostly off the
coast
of
Britain and Ireland
and
the North
Sea, with
scattered
populations
in
the tropics
.
Description
They are
Laganiformes
with:
simple
radial
internal
buttresses
along interambulacral
margins
;
periproct close to
peristome
and
opening
bounded
by first and second
paired
post-basicoronal interambulacral
plates
interambulacral zones
terminating
adaptively in one or two single
small plates
basicoronal
circlet
small and unspecialized
no
food
grooves
