Spergo is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae.
Description The large, thin shell is nearly destitute of sculpture. It shows an unrecurved 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, unarmed 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 is absent. The dentition resembles that of Bela.
This form resembles Pleurotomella, Verrill, from which it differs in the character of the rostrum and pharynx, in the possession of eyes, in its straight wide siphonal canal, and in having a feebler type of verge, anal notch and fasciole. W.H. Dall, Report on the Mollusca and Brachiopoda dredged in deep water, chiefly near the Hawaiian Islands, with illustrations of hitherto unfigured species from Northwest America; Proceedings of the United States National Museum. vol. 17 (1895)
Species Species within the genus Spergo include: Spergo africana (Sysoev, 1996) Spergo aithorrhis Sysoev & Bouchet, 2001 Spergo annulata Criscione, Hallan, Puillandre & Fedosov, 2021 Spergo bululi (Stahlschmidt, Poppe & Tagaro, 2018) Spergo castellum Criscione, Hallan, Puillandre & Fedosov, 2021 Spergo chuni (E. von Martens, 1901) Spergo daphnelloides (Dall, 1895) † Spergo fusus MacNeil, 1961 Spergo glandiniformis (Dall, 1895) Spergo oculifera (Kantor & Sysoev, 1986) Spergo parunculis Stahlschmidt, Chino & Fraussen, 2015 Spergo parvidentata Criscione, Hallan, Puillandre & Fedosov, 2021 Spergo sibogae Schepman, 1913 Spergo tenuiconcha Criscione, Hallan, Puillandre & Fedosov, 2021
Species brought into synonymy Spergo fusiformis (Habe, 1962): synonym of Speoides fusiformis (Kuroda & T. Habe, 1961) (superseded combination) Spergo glandiformis (Dall, 1895): synonym of Spergo glandiniformis (Dall, 1895) (misspelling) Spergo nipponensis Okutani & Iwahori, 1992: synonym of Borsonia nipponensis (Okutani & Iwahori, 1992) (superseded combination) Spergo (Speoides) yoshidai (Kuroda & Habe, 1961): synonym of Speoides yoshidai Kuroda & T. Habe, 1961 (superseded combination)
References
Bouchet P. & Rocroi J.-P. (2010). Nomenclator of Molluscan Supraspecific Names.
External links Bouchet, P.; Kantor, Y. I.; Sysoev, A.; Puillandre, N. (2011). A new operational classification of the Conoidea (Gastropoda). Journal of Molluscan Studies. 77(3): 273-308
Worldwide Mollusc Species Data Base: Raphitomidae