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species

Conus lohri R. N. Kilburn, 1972

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Conidae »  genus Conus - Cones »  subgenus Darioconus

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Conus lohri

Author: Jan Delsing

Conus lohri

Author: Jan Delsing

Conus lohri

Author: Jan Delsing

Conus lohri

Author: Off Sea & Shore

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Description

Rather narrowly conical, sides of body whorl almost straight; spire low and obtusely rounded, except for the rather depressed, mucronate apex; spire whorls gently convex. Greatest width of shell just below shoulder. Young specimens show traces of microscopic spiral striae on the spire and over most of the body whorl, but in the adult these are no longer visible, save for very faint indications of striae on the base of the body whorl; growth lines rather distinct, particularly on the shoulder slope. Base slightly twisted, forming a fasciolar swelling towards the base of the labium. Aperture becoming steadily wider towards the base, except where interrupted by the above-mentioned swelling. Anal sinus rather deep, forming a slightly L-shaped curve. Limits of protoconch not clear, probably 3 whorls; teleconch whorls at least 7.
Ground colour brownish-orange, fading to orange-buff, body whorl often with two broad zones of darker transverse hairlines, one zone occupying the base, the other lying around the middle; shoulder slope with a series of rather irregular but predominantly arrowhead-shaped chestnut marks; aperture light violaceous, fading to flesh-colour. Periostracum thin, close, rather smooth and opaque, colour dull brown. Operculum reduced, unguiculate, margins not serrated; apex broken off in only available example (holotype), but length of remainder 5,2 mm (length of aperture 36,3 mm).
Radula (terminology after Nybakken, 1970): Shaft of each tooth very slender and markedly curved, but rather flexible; canal closed. Base without a lateral spur, but the shaft shows a small basally-directed cusp just above the very slight indication of a waist, followed by a double row of small serrations, which extend as far as the distal opening of the median duct. Tip with a single barb and a low blade, which has a barblike ending. Although proportionally much longer and more slender, there is a very marked resemblance to the radula of Conus virgo Linn., as figured by Peile (1939: text-fig. 12), except that the latter shows a basal spur to be present, and the row of serrations to be single. However in an example of virgo examined from Bazaruto Island the spur is in fact absent and the serrations show a tendency towards splitting into two series, just as in lohri. Kohn (1959: 316) reported that C. virgo was vermivorous. Unfortunately the stomach of the holotype of lohri only contained an amorphous pink mass, which could not be identified. Shell dimensions: 40,2 x 23,4 mm (holotype); 63 X 35,5 mm, 56,9 X 31,3 mm, 44,4 X 24,4 mm (paratypes).
Kilburn R.N. 1972 - Taxonomic notes on South African marine Mollusca (2), with the description of new species and subspecies of Conus, Nassarius, Vexillum and Demoulia

Interchangeable taxa

Although there is nothing striking about the present species, it displays a combination of characters which clearly set it apart from its congeners. It has been officially recorded as Conus consors Sowerby, 1833, which it does resemble in some respects, but from which lohri differs in its blunter shoulder, more obtuse spire, mucronate apex, and smooth, convex shoulder slope, this area being markedly concave and distinctly striate in consors. Conus ochroleucus Gmelin, 1791, also approaches lohri to some extent in general form, apertural characters and basic colour pattern, but differs in the presence of conspicuous basal grooves, and in its narrower proportions, more conical spire and striate shoulder slope. The only other species with which comparison is warranted is Conus virgo Linn., 1758, which possesses a radula of very similar basic structure; however, the two differ widely in shell shape, coloration and sculpture.
Kilburn R.N. 1972 - Taxonomic notes on South African marine Mollusca (2), with the description of new species and subspecies of Conus, Nassarius, Vexillum and Demoulia

Distribution

Hibberdene on the Natal south coast to Baia dos Cocos in Mocambique. Type locality: Baia dos Cocos, between Inhambane and Jangamo Beach (about 24°S.), MOZAMBIQUE.
In addition to the type material, specimens from Clansthal and Hibberdene have been examined.
The holotype was found on the inner side of an exposed reef, in 2-3 m of water on a flat rocky ledge covered in algal turf. It was collected by Mr M. Lohr of Alberton, in whose honour it is named.
Kilburn R.N. 1972 - Taxonomic notes on South African marine Mollusca (2), with the description of new species and subspecies of Conus, Nassarius, Vexillum and Demoulia
Author: Jan Delsing

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