The main body forms a chamber with an aperture at the oral end, which is closed by an operculum.  The oral end is generally extended into a neck.  The outer wall may be smooth, or variously ornamented by striations, tubercles, hairs, isolated or distally connected spines.  Ornamentation may be limited to the aboral end.

Round-bottomed Vesicle

Triangular Vesicle

Ornamented Vesicle

Aboral Spines

Chain of Vesicles


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