''Spergo'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

sea snail Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...

s, marine

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...

s in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Raphitomidae Raphitomidae is a Family (biology), family of small to medium-sized sea snails, marine (ocean), marine gastropod mollusks in the superfamily Conoidea.Bouchet P. & Rocroi J.-P. (Ed.) (2005). "Classification and nomenclator of gastropod families" ...

Description

The large, thin shell is nearly destitute of

sculpture Sculpture is the branch of the visual arts that operates in three dimensions. Sculpture is the three-dimensional art work which is physically presented in the dimensions of height, width and depth. It is one of the plastic arts. Durable sc ...

. It shows an unrecurved

columella Lucius Junius Moderatus Columella (, Arabic: ) was a prominent Roman writer on agriculture in the Roman Empire. His in twelve volumes has been completely preserved and forms an important source on Roman agriculture and ancient Roman cuisin ...

, a short, wide, straight

siphonal canal The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water i ...

, 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 ''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.

Species

Species within the genus ''Spergo'' include: * ''Spergo aithorrhis'' Sysoev & Bouchet, 2001 * ''Spergo annulata'' Criscione, Hallan, Puillandre & Fedosov, 2021 * ''Spergo castellum'' Criscione, Hallan, Puillandre & Fedosov, 2021 * ''Spergo fusiformis'' (Habe, 1962) * ''Spergo glandiniformis'' (Dall, 1895) * ''Spergo nipponensis'' Okutani & Iwahori, 1992 * ''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 glandiformis'' (Dall, 1895): synonym of ''Spergo glandiniformis'' (Dall, 1895) (misspelling)

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
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{{Taxonbar, from=Q3722380 Spergo, Raphitomidae Gastropod genera