Spergo
''Spergo'' is a genus of sea snails, marine gastropod mollusks in the family (biology), family Raphitomidae. Description The large, thin shell is nearly destitute of Sculpture (mollusc), sculpture. It shows an unrecurved Columella (gastropod), columella, a short, wide, straight siphonal canal, a wide shallow emargination representing the anal notch, and generally feeble anal fasciole, except in the very young. There is a sharp outer Lip (gastropod), lip, unarmed Aperture (mollusc), aperture, and a sinusigera protoconch. The animal has a muzzle formed by a stout squarely truncated rostrum opening into a capacious pharynx, provided internally with a degenerate proboscis not capable of extrusion beyond the oral orifice, with a poison gland and a degenerate radula. Eyes are present and functional. The tentacles are low-seated, stout, and clavate. The Operculum (gastropod), operculum is absent. The dentition resembles that of Bela (gastropod), Bela. This form resembles ''Pleurotomel ...
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