Busycon contrarium mm 200 Extra Large Sinistrofulgur sinistrum Seashell Gastropoda Sea Snail Busycon Whelks Busyconidae

usycon perversum Big Size Extralarge mm 200 Seashell Gastropoda Sea Snail Busycon Whelks Sinistrofulgur Busyconidae, laevogyrous (left opening), unique piece, as in pictures.
Family: Busyconidae (Busycon Whelks).
Common name: The Lightning Whelk.
Syn. Busycon (Sinistrofulgur) aspinosum, Busycon (Sinistrofulgur) sinistrum, Busycon perversum sinistrum, Busycon sinistrum.

Sinistrofulgur sinistrum was named by S. C. Hollister in 1958, originally as Busycon (Sinistrofulgur) sinistrum.
It had previously been included in the species Busycon contrarium, now known as Sinistrofulgur contrarium, but S. contrarium is now considered an exclusively fossil species.
A study by Wise and colleagues in 2004 found that the level of genetic divergence between lightning whelk populations in different regions were low enough to be considered a single species with three subspecies, Busycon perversum perversum, B. perversum sinistrum, and B. perversum laeostomum.
In contrast, in 2015 Petuch recognized four distinct species, including Sinistrofulgur sinistrum, distinguishing them by their range and shell morphology.
As of 2024, Sinistrofulgur sinistrum is listed as an accepted species on MolluscaBase.