''Spergo'' is a
genus of
sea snail
Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...
s, marine
gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda ().
This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...
mollusks in the
family Raphitomidae
Raphitomidae is a family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.Bouchet P. & Rocroi J.-P. (Ed.) (2005). "Classification and nomenclator of gastropod families". ''Malacologia'' 47(1-2). . 39 ...
.
Description
The large, thin shell is nearly destitute of
sculpture. It shows an unrecurved
columella, 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 is ...
, 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
''Pleurotomella'' is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae.
Description
(Original description by Verrill) As at present understood, this genus is intended to include those species which have a rather broa ...
'', 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
''Spergo fusiformis'' is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.
Description
The length of the shell varies between 75 mm and 122 mm.
Distribution
This marine species occurs off Madagascar, New Caled ...
''
(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*
{{Taxonbar, from=Q3722380
Raphitomidae
Gastropod genera