Conorbidae

Conorbidae is a monophyletic family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.Tucker J.K. & Tenorio M.J. (2009) Systematic classification of Recent and fossil conoidean gastropods. Hackenheim: Conchbooks. 296 pp., at p. 133 Bouchet P., Kantor Yu.I., Sysoev A. & Puillandre N. (2011) A new operational classification of the Conoidea. Journal of Molluscan Studies 77: 273-308.
/ref>Bouchet P. & Rocroi J.-P. (Ed.) (2005). "Classification and nomenclator of gastropod families". ''Malacologia'' 47(1-2). . 397 pp.Bouchet, P. (2011). Conorbidae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=153962 on 2011-08-12 Despite the name of the family, which might seem to suggest otherwise, this group of gastropods are ''not'' cone snails, but are instead what used to be loosely called "turrids".

Taxonomy

In 2009, John K. Tucker and Manuel J. Tenorio elevated the subfamily Conorbiinae (at that point it was placed in the family Conidae) to the rank of family. This was based on a cladistical analysis of anatomical characters including the radular tooth, morphology (i.e. shell characters), as well as an analysis of prior molecular phylogeny studies, all of which was used to construct phylogenetic trees. Tucker and Tenorio noted a close relationship to genera such as ''Bathytoma'' in their phylogeny, which corresponded to prior molecular studies by Puillandre ''et al.''. Shortly thereafter, in 2011, Bouchet, Kantor ''et al.'' confirmed the elevation of the subfamily Conorbiinae to the rank of family based upon a detailed molecular phylogeny of a dataset of molecular sequences of three gene (DNA) fragments conducted across the superfamily Conoidea. Tucker and Tenorio’s proposed classification system for the cone shells and their allies (and the other clades of Conoidean gastropods ) is shown in Tucker & Tenorio cone snail taxonomy 2009.

Like other species in the superfamily Conoidea, these snails are predatory and venomous, able to inject neurotoxins into their prey with their radula.

Description

The shell can have different forms: from squatly conical to elongated or even biconical. There are no nodules on the shell, but cords may be present. The interior of the shell, including the columellar region, is substantially remodeled (meaning that the external sculpture is reabsorbed when the body whorl grows over it). Two of the three genera in this family have an asymmetrical anal notch. The spire in the fossil genus ''Conorbis'' is much elevated. Its outer lip is sinuous, forming an oblique posterior sinus.George Washington Tryon, ''An introduction to the study of the Mollusca'', vol. I p. 188; 1882

The living species of this family possess several primitive radular characteristics; they do not have the folds which are present in all other closely related families. The radula usually has an anterior fold, without a waist, base, C-fold, terminating cusps, serrations or accessory process. The basal spur is either parallel with the tooth base or directed towards the apex of the tooth.

Genera

Genera within the family Conorbidae include:
* ''Artemidiconus'' da Motta, 1991 (consisting of one living species, with no fossil record)
* ''Benthofascis'' Iredale, 1936 (consisting of six living species, with no fossil record)
* † ''Conorbis'' Swainson, 1840 (fossil genus from the Eocene and Oligocene consisting of 14 recognized fossil species)

References

External links

Image of ''Artemidiconus selenae'' (van Mol, Tursch & Kempf, 1967) at Gastropods.com

Image of ''Benthofascis biconica'' (Hedley, 1903) at Gastropods.com

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