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Epitoniidae Berry, 1910 (1812)

Boreoscala rhytida

(Dall, 1917)

Description:

Dimensions range from 5.5 mm - 5.5 mm high and 2 mm wide.
Width to height ratio: 0.36:1 ~ 0.36:1

Shell: subcylindric; minute. Exterior colour pinkish white. About 10 whorls, rounded; strongly sculptured. Suture deep. Imperforate. Approximately 18 - 19 costae on the body whorl. Costae are low, thick, rounded, crenate. Intercostal spaces whorls spirally sculptured with flattish cords. Interstices with approximately 8 - 10 spiral striae per whorl. Base flattish, nearly smooth, bordered with a strong cord. Columella short and arched. Aperture subcircular. Operculum unknown.


Distribution:

Known only by one specimen from off the Galápagos Islands [Dushane, 1974]


Habitat:

73-1160 m [Kaiser, 1995]


Type Material:

Holotype: U.S. Nat. Mus. Cat. No. 207604 [as Epitonium rhytidum Dall, 1917] - Locality: Galapagos Islands. [Dall, W. H., 1917]
Holotype: USNM 207604 [as Epitonium rhytidum Dall, 1917] - Locality: Galápagos Islands, 40-634 fms [= 73-1159 m].. [Brown, L. & Neville, B.D., 2015]


SpeciesImage

DuShane, H. (1974). pp: 30. Fig. 52.

Epitonium rhytidum Dall, 1917
Holotype, USNM 207 604; length 6| mm; width 3 mm X 9.8

Distribution

as listed in source literature

Dall, W. H. (1917).
Shown in text as Epitonium rhytidum Dall, 1917
Species Image
pp: 486.
Dushane, H. (1974).
Shown in text as Epitonium rhytidum Dall, 1917
Species Image
pp: 30. Fig. 52.
Epitonium rhytidum Dall, 1917
Holotype, USNM 207 604; length 6| mm; width 3 mm X 9.8
Species Image
pp: 24.
Species Image
pp: 24.

Synonymy:

Epitonium rhytidum Dall, 1917 [in Brown, L. & Neville, B.D., 2015].
Epitonium rhytidum Dall, 1917 [in Dall, W. H., 1917].
Epitonium rhytidum Dall, 1917 [in DuShane, H., 1974].


Source Literature:

Brown, L. & Neville, B.D. (2015). Catalog of the recent taxa of the families Epitoniidae and Nystiellidae (Mollusca: Gastropoda) with a bibliography of the descriptive and systematic literature. Zootaxa. 3907(1). Magnolia Press Auckland, New Zealand. http://dx.doi.org/10.11646/zootaxa.3907.1.1 [Accessed 22 October 2023]
Dall, W. H. (1917). Notes on the shells of the genus Epitonium and its allies of the Pacific coast of America.. Proceedings of the US National Museum. 53(2217). https://www.biodiversitylibrary.org/page/7553869 [Accessed 18 September 2023]
DuShane, H. (1974). The Panamic-Galapagan Epitoniidae. The Veliger. 16 (Sup. 14). https://www.biodiversitylibrary.org/page/42500298 [Accessed 25 September 2023]
Kaiser, K. L. (1995). The recent molluscan marine fauna of the Islas Galapagos. The Festivus. 29. San Diego Shell Club. https://www.biodiversitylibrary.org/page/53297908?t=129924 [Accessed 7 August 2025]
Weil, A., Brown, L. & Neville, B. (1999). The Wentletrap Book. Evolver
WoRMS Editorial Board (2025). World Register of Marine Species. https://www.marinespecies.org [Accessed 8 November 2025]

WoRMS direct page link: Open WoRMS record