Acmella roepstorffiana Nevill, 1878
“This small species, a few specimens only of which were found by the late Dr. Stoliczka at Katchall, one of the Nicobar Islands, is distinguished from all the other described species of the genus by its being throughout regularly, rather strongly striated, the striae being acute and " thread-like", the shell is of a silky, translucent and shining texture, with 5 almost cylindrically turreted whorls, the last a trifle compressed at the periphery; the umbilicus is exceedingly narrow and partially overlapped by the thickened peristome, which here and there, under the lens, clearly shows a duplex character; the aperture is very small, unusually broad in proportion to its height, and almost circular, with the margins almost but not quite continuous, the columellar one being abruptly bent back over the umbilicus, and then beautifully and boldly rounded. I named this interesting little species after my friend Mr. F. A. de Roepstorff, Dep. Sup. Andaman-I. Commission, to whom both the Museum at Copenhagen and myself are indebted for many interesting Mollusca and Coleoptera from the Andaman and Nicobar Islands.” (Godwin-Austen & Nevill, 1879)
Godwin-Austen & Nevill (1879) descriptions on Acmella roepstorffiana – “Testa minima, peranguste umbilicata, conico-turrita, nitida, subtranslucida, sericina, omnino distincte, subconfertim et regulariter striata, striis acute filiformibus, obliquis, ad basin flexuosis, prope regionem umbilicalem paululum magis conspicuis; anfract. 5, gradati, vix convexiusculi, sutura excavata sejuncti, ultimo subcylindrico, ad peripheriam paululum compresso; apertura minima, subcircularis, peristomate incrassato, haud continue, subobsolete duplici, margine externa perconvexo, margine columellari valide retrorsum arcuato plus minusve umbilicum tegente.”
Acmella roepstorffiana – “Long, l½ diam. 1 mill.” (Godwin-Austen & Nevill, 1879)
Other locality – “Katchall, one of the Nicobar Islands” Leg. Stoliczka (Godwin-Austen & Nevill, 1879)