Deuterostomes

Asteroidea

Sea Stars

ordo-recent

intertidal to offshore and deep sea

Regular echinoids- lives on top of substrate

Cidaroids

Mesozoic

normal marine salinity

Irregular echinoids- evolved in jurassic became flattened in cenozoic

Spantangoids - heart urchin

burrowing(all irregular burrow)

normal marine salinity

Irregular echinoids

Clypeasters

burrowing (all irregular burrow)

Sand Dollar - burrows in sed, holes are called lunules

Irregular echinoids

Clypeasters- Sea Biscuit

burrowing(all irregular burrow)

Blastoids

Pentremites

Carboniferous

nearshore

planktonic graptolites

ordo-dev

marine only

lost their branches over time as evolved from cambrian

crinoids

cambrian to recent, particularly missiissipian

have cirri

shallow carbonate shoals in outer shelf