Alvania cruzi is a species of small sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.MolluscaBase eds. (2023). MolluscaBase. Alvania herwigia (Castellanos & D. E. Fernández, 1974). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=532375 on 2023-12-28
Originally described as Rissoa cruzi by Castellanos and Fernández in 1974, it was reclassified into the genus Alvania based on shell characteristics.
This species was first documented in southern Brazilian waters more than 35 years after its initial description.
Description The length of the shell varies between 2.2 mm and 3 mm.
Distribution This species occurs in the Atlantic Ocean off Southern Brazil.
References
Castellanos, Z. J. A. de & Fernández, D. E. (1974). Nuevas Rissoa Freminuille 1813 del Atlántico sudoccidental (Mollusca Rissoacea). Neotrópica. 20 (63): 153–155.
External links Wiggers F. & Veitenheimer-Mendes I. (2009) First record and new combination of a rissoid gastropod from off south Brazil. Biotemas 22 (4): 251-254