Agladrillia benjamini

Agladrillia benjamini
Original image of a shell of Agladrillia benjamini
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Superfamily:	Conoidea
Family:	Drilliidae
Genus:	Agladrillia
Species:	A. benjamini
Binomial name
Agladrillia benjamini (Bartsch, 1915)
Synonyms [1]
Mangilia benjaminiBartsch, 1915

Agladrillia benjamini is a species of sea snail, a marine gastropod mollusk in the family Drilliidae. ^{[1] [2]}

Description

The length of the species attains 15.3 mm, its diameter 5.7 mm.

(Original description) The elongate-conic shell is flesh-colored, with a protoconch that contains more than one smooth whorl. The whorls of the teleoconch are strongly rounded. The sinus is located at the summit, where the whorls are somewhat contracted.

The surface of the teleoconch whorls features strong, rounded, protracted axial ribs, which start just anterior to the sinus and extend prominently to the periphery, becoming less defined anteriorly on the body whorl. These ribs number 10 on the first to fourth whorls, 12 on the fifth to seventh, and 14 on the penultimate whorl. The axial ribs are about as wide as the spaces separating them.

In addition to the axial ribs, the whorls are adorned with numerous slender spiral threads. About five spiral threads are present in the sinus area on the last three whorls, which are finer than those covering the rest of the whorl between the sutures. There are three spiral threads on the first to third whorls, four on the fourth, seven on the fifth and sixth, eleven on the next, and thirteen on the last turn.

The spaces between the spiral threads are approximately equal in strength to the threads themselves. The surface between the spiral threads is covered with fine granulations on the spire. The body whorl, just before the periphery, is marked by 27 spiral cords that are about equal in size and spacing, becoming only slightly stronger on the columella. The sutures are well constricted. The aperture has a strong, deep sinus at its posterior angle, making the outer lip, anterior to this, distinctly claw-like. The outer lip is strongly reinforced internally by a callus that has about 15 denticulations on its inner surface. The columella and the parietal wall are glazed with a thin callus. ^[3]

Distribution

This marine species occurs off South Africa. ^[3]

References

1. Agladrillia benjamini (Bartsch, 1915) . Retrieved through: World Register of Marine Species  on 5 September 2011.
2. P. Bouchet; Yu. I. Kantor; A. Sysoev; N. Puillandre (2011). "A new operational classification of the Conoidea (Gastropoda)". Journal of Molluscan Studies . 77 (3): 273–308. doi: 10.1093/mollus/eyr017 .
3. Bartsch, P. (1915). "Report on the Turton collection of South African marine mollusks, with additional notes on other South African shells contained in the United States National Museum". Bulletin of the United States National Museum. 91. Retrieved 25 June 2024. This article incorporates text from this source, which is in the public domain .