Sinezona semicostata
Sinezona semicostata is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Scissurellidae, the little slit shells.

Description
The size of the shell varies between 0.5 mm and 0.7 mm.

Distribution
This species occurs in the Atlantic Ocean off the Canary Islands, Madeira and Cape Verde and in the Mediterranean Sea off Italy.

References

 Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180–213 
 Rolán E., 2005. Malacological Fauna From The Cape Verde Archipelago. Part 1, Polyplacophora and Gastropoda.
 Geiger D.L. (2012) Monograph of the little slit shells. Volume 1. Introduction, Scissurellidae. pp. 1–728. Volume 2. Anatomidae, Larocheidae, Depressizonidae, Sutilizonidae, Temnocinclidae. pp. 729–1291. Santa Barbara Museum of Natural History Monographs Number 7

External links
 

Scissurellidae
Gastropods described in 1990
Molluscs of Madeira
Molluscs of the Canary Islands
Gastropods of Cape Verde