Pusia exigua is a species of sea snail, a marine gastropod mollusk, in the family Costellariidae, the ribbed miters.
It was classified by C. B. Adams in 1845.
Description (Original description in Latin) The shell is very small, possessing an oval-elongated shape and a whitish color. It consists of six whorls, which are structured with numerous small ribs on the upper portion and broad ribs on the lower portion.
The upper parts of the whorls are a dark, blackish-purple, while the lower parts are spotted with brown. The body whorl is sculpted on its lower half in the same manner as the upper half. The siphonal canal is notably short.
Dimensions: Total Length: 0.13 in (approx. 3.3 mm); spire Length: 0.075 in (approx. 1.9 mm).
Distribution This species occurs in the Caribbean Sea off Jamaica and Guadeloupe.
References
Nowell-Usticke, G. W. 1969. A supplementary listing of new shells (illustrated). To be added to the Check List of the marine shells of St. Croix. Burlington, Vermont: Lane Press. 32 pp., 6 pls.
External links Sowerby, G. B. II. (1874). Monograph of the genus Mitra. In G. B. Sowerby II (ed.), Thesaurus conchyliorum, or monographs of genera of shells. Vol. 4 (31-32): 1–46, pls 352–379. London, privately published.