Olssonella scalatella (Guppy, 1873), originally described from early Pliocene deposits in Jamaica, still occurs as a recent species off the northern coast of S. America. This opinion is based on shells collected off Surinam and French Guyana, fossil specimens from the type-locality, and data from the literature. O. smithii (Dall, 1888) is considered a closely related recent species, occurring more to the north; it differs from O. scalatella mainly in characters of the protoconch. Conchological characters of the two taxa are discussed and some general notes are given concerning the importance of protoconch characters.

Mollusca, Cancellariidae, Olssonella, South America
Zoologische Mededelingen

Released under the CC-BY 4.0 ("Attribution") License

Naturalis journals & series

Verhecken, A. (1984). Olssoνella Scalatella (Guppy) living off northern South America (Mollusca: Neogastropoda: Cancellariidae). Zoologische Mededelingen, 58(2), 11–21.