Family: Peristomal disc usually on stalk; with furrow that separates, elevates disc from margin of zooid.
Genus: Colonical when mature; macronucleus long, often C-shaped; some species loricate (Illustrated Guide, 1985). Stalk non-contractile.
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Opercularia sp.
μm
Japan, 199?
Opercularia sp.
112 μm
Japan, 1997
Opercularia sp.
μm
W.R.
Kashiwa
Chiba, 2008
