Borsonella callicesta

Borsonella callicesta
Shell of Borsonella callicesta
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Superfamily:	Conoidea
Family:	Borsoniidae
Genus:	Borsonella
Species:	B. callicesta
Binomial name
Borsonella callicesta (Dall, 1902) [1]
Synonyms [2]
Antiplanes amphitriteDall, 1919 junior subjective synonym Antiplanes amphitrite var. beroeDall, 1919 junior subjective synonym Cryptogemma cymothoëDall, 1919 Cryptogemma eidolaDall, W.H., 1919 Gemmula esuriensDall, W.H., 1908 Gemmula esuriens pernoda (f) Dall, W.H., 1908 Pleurotoma callicestaDall, 1902 Spirotropis cymothoë(Dall, 1919)[ citation needed ]

Borsonella callicesta is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae. ^[2]

Description

The length of the shell attains 13.5 mm, its diameter 6 mm.

The small shell is white, covered with an olivaceous periostracum, and with four whorls exclusive of an apical whorl or two (which in the specimens is always eroded). The suture is distinct. The edge of the whorl in front of it is slightly thickened. The spiral sculpture on the upper whorls consists of a somewhat blunt peripheral keel, undulated more or less toward the apex and obsolete on the body whorl. Other sculpture consists of minute, broken, irregular, more or less oblique, usually punctate impressed lines. The aperture is simple. The outer lip is sharp. The body of the shell is erased and white. The siphonal canal is short, somewhat recurved

The height of four whorls, 15 mm; of the body whorl, 10 mm; diameter of the shell: 7 mm. ^[3]

(Described as Antiplanes amphitrite) The white shell is covered with a pale olivaceous periostracum. It contains five or more well-rounded whorls exclusive of the (lost) protoconch. These show a rounded shoulder and a distinct but not appressed suture. The axial sculpture consists of, on the spire, obscure nodulations at the shoulder (about 15 on the penultimate whorl) which do not form ribs and are absent from the body whorl. The incremental lines are fine but obscure. Beside these there are minute, anteriorly obliquely retractive lines somewhat microscopically reticulated by the lines of growth.tTere is no spiral sculpture except on some specimens a few obsolete lines on the base. The anal sulcus is shallow, slightly removed from the suture. The fasciole is lightly impressed on the body whorl. The aperture is narrow. The outer lip is thin, sharp and arcuately produced. The inner lip is erased. The columella is white, solid straight, anteriorly obliquely attenuated. The siphonal canal is wide, straight and distinct ^[4]

Distribution

This species occurs in the Pacific Ocean off San Diego, California, Mexico and in the Gulf of Panama.

References

1. Dall, W.H. (1902) Illustrations and descriptions of new, unfigured, or imperfectly known shells, chiefly American, in the U. S. National Museum. Proceedings of the United States National Museum, 24, 499–566, pls. 27–40.
2. Borsonella callicesta (Dall, 1902) . 13 August 2011. Retrieved through: World Register of Marine Species .
3. Dall (1919) Descriptions of new species of Mollusca from the North Pacific Ocean; Proceedings of the U.S. National Museum, vol. 56 (1920) p. 300 (described as Cryptogemma eidola)
4. Dall (1919) Descriptions of new species of Mollusca from the North Pacific Ocean; Proceedings of the U.S. National Museum, vol. 56 pp.1–86, 24 pls (1920) This article incorporates text from this source, which is in the public domain .

• Tucker, J.K. (2004). "Catalog of recent and fossil turrids (Mollusca: Gastropoda)" (PDF). Zootaxa. 682: 1–1295. doi:10.11646/zootaxa.682.1.1.