Conus desidiosus

Conus desidiosus
Apertural and abapertural views of shell of Conus desidiosus Adams, A., 1854
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Caenogastropoda
Clade: Hypsogastropoda
Clade: Neogastropoda
Family: Conidae
Genus: Conus
Species: C. desidiosus
Binomial name
Conus desidiosus
A. Adams, 1855

Conus desidiosus is a species of sea snail, a marine gastropod mollusk in the family Conidae, the cone snails and their allies.[1]

Like all species within the genus Conus, these snails are predatory and venomous. They are capable of "stinging" humans, therefore live ones should be handled carefully or not at all.

Description

In the original description of Adams of 1854, this shell is described having a pyramidal and conical head, with the base crossed by oblique grooves, enough deeply incised; his color is light brown, last whorls is crossed by a wide whitish band and lines of brown color, with whitish wavy lines on the back. The spire is high and conical, the sutural ramps are flat, with two spiral grooves in the median part, the lip is arcuate, with a depression in the back. The size of the specimen described by Adams, from the Collection Cuming, is 24.1 x 11.6 mm. The origin indicated in the description of Adams is West Africa.

Distribution

In a range of about 50 km around Faro, in Portugal, there is a variety of Conus ventricosus with particular characteristics of color that is considered to belong to this species. On the basis of the characteristics of these specimens, some tend to define as Conus desidiosus also other varieties of Conus ventricosus similar to those of Portugal, but with yellow ground color.

In 1991 Raybaudi examined some specimens of Conus from Lampedusa, that an Italian collector submitted to his attention, and she noticed an apparent resemblance of their color with that of Conus desidiosus. The different origin, Lampedusa instead of West Africa, could have suspected that it was a different species, however, because it would mean admitting the existence in the Mediterranean Sea of a new species of Conus, Raybaudi preferred to conclude that the population of Lampedusa coincided almost perfectly with the holotype of Adams, therefore proposed to modify the Locus Typicus from the original by Adams, namely West Africa, to Lampedusa. In 1992, Raybaudi, always speaking of the specimens found in Lampedusa, referred to some specimens described by Saunders in 1978 as Conus cf. guinaicus: due to some resemblance of the coloration of these Conus with those from Lampedusa, she felt that the latter were a form of color of a population of Lampedusa of Conus guinaicus. This consideration seems consistent and correct, except for one thing, that, in 1992, Raybaudi could not know: the specimens described by Saunders can be identified as Conus guanche (Lauer, 1993) and specimens of Lampedusa are therefore considered to be color forms of Conus guanche. In addition, Raybaudi did not count the vast diversity in the morphology of the Conus from Lampedusa with the holotype of Conus desidiosus and even differences in the structure of the color: the aspects are easier to note are the different inclination of the spiral band placed just under half of last whorl, and the greater curvature of the growing lines towards the base of the Conus from Lampedusa, related to the curvature of the lines of growth of the holotype of Conus desidiosus.

Although you may notice some minor morphological differences, however, fully justified, both from possible intraspecific variability, both from the time elapsed from the Pliocene to the present, some fossil specimens from Upper Pliocene were found near Pietrafitta and near "Macchia della Turchina".

References

  1. ↑ Conus desidiosus A. Adams, 1855.  Retrieved through: World Register of Marine Species on 28 March 2010.
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