Species of gastropod
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Lobatus raninus, common name the hawk-wing conch, is a species of medium to large sea snail, a marine gastropod mollusk in the family Strombidae, the true conchs.
Shell description.
The maximum recorded shell length is 121 mm or up to 130 mm. Like other species in the same genus, "Lobatus raninus" has a robust, somewhat heavy and solid shell, with a distinct stromboid notch. The body whorl is dorsally ornamented by characteristic coarse spiral ridges. The posterior expansion of the flaring outer lip is always lower than the spire. The color is brownish, with several disperse white spots. Both inner and outer lips are cream or white.
Phylogeny.
The phylogenetic relationships among the Strombidae have been mainly accessed on two occasions, using two methods. In 2005, Simone proposed a cladogram (a tree of descent) based on an extensive morpho-anatomical analysis of representatives of Aporrhaidae, Strombidae, Xenophoridae and Struthiolariidae, including "L. raninus" (there referred to as "Tricornis raninus").
With the exception of "Lambis" and "Terebellum", the remaining taxa were previously allocated within the genus "Strombus". However, according to Simone, only "Strombus gracilior", "Strombus alatus" and "Strombus pugilis", the type species, remained within "Strombus", as they constituted a distinct group based on at least five synapomorphies (traits that are shared by two or more taxa and their most recent common ancestor). The remaining taxa were previously considered as subgenera, and were elevated to genus level by Simone in the end of his analysis. The genus "Tricornis" (now considered a synonym of "Lobatus"), in this case, only included "T. raninus" (now considered a synonym of "Lobatus raninus").
A different approach, this time based on sequences of nuclear histone H3 and mitochondrial cytochrome-c oxidase I (COI) genes was proposed by Latiolais "et al". (2006). The phylogenic relations of (32 analyzed) species that used to belong or still belong in the genus "Strombus" and "Lambis" are shown below:
Distribution.
This species is distributed in the Caribbean Sea, the Gulf of Mexico and the Lesser Antilles.
Ecology.
"S. raninus" lives near seagrass beds, usually in shallow water. The minimum recorded depth is 0.3 m; the maximum recorded depth is 55 m.
Like other species of the genus "Strombus", "S. raninus" is known to be a herbivore.
References.
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