Small,solitary free-swimming,pelagic neotenic larva-like forms, notochord,nerve cord and brain.
Test forming a temporary.
Atrium and atrial apeerture absent.
Gill-slits 2, opening directly to outside.
Sexes united
No metmorphosis.
.
Test forming a temporary.
Atrium and atrial apeerture absent.
Gill-slits 2, opening directly to outside.
Sexes united
No metmorphosis.
.
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