Bactrocythara obtusa is an extinct species of sea snail, a marine gastropod mollusk in the family Mangeliidae.MolluscaBase eds. (2026). MolluscaBase. Bactrocythara obtusa (Guppy, 1896) †. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=992973 on 2026-06-30
Fossilworks: Bactrocythara ascara
Description The length of its shell reached 5.4 mm and its diameter 1.9 mm.
The outline, nucleus, and aperture are conform to the description given for the genus. The sculpture consists of narrow axial ribs, numbering 12 to 14 on the penultimate whorl, which become strongly hooked over the area corresponding to the anal fasciole. Between these ribs lie spiral cords that, on the body whorl of adult shells, almost or completely disappear, leaving the axial elements dominant. The columella is sculptured with spiral threads that continue the spiral ornamentation internally. W.P. Woodring. 1928. Miocene Molluscs from Bowden, Jamaica. Part 2: Gastropods and discussion of results . Contributions to the Geology and Palaeontology of the West Indies
Distribution This extinct species was found in the Pliocene strata of Jamaica. It existed from 3.6 to 2.588 Ma.
References
A. J. W. Hendy, D. P. Buick, K. V. Bulinski, C. A. Ferguson, and A. I. Miller. 2008. Unpublished census data from Atlantic coastal plain and circum-Caribbean Neogene assemblages and taxonomic opinions.
External links Guppy, Robert John Lechmere. Descriptions of Tertiary fossils from the Antillean region. Vol. 19. No. 1110. US Government Printing Office, 1896 W.P. Woodring. 1928. Miocene Molluscs from Bowden, Jamaica. Part 2: Gastropods and discussion of results . Contributions to the Geology and Palaeontology of the West Indies