Cylichnoides is a genus of headshield slugs that belongs to the family Eosdaphandridae.
Members of this genus are widely distributed across boreal and arctic waters being found in Alaska, Canada, Greenland, Iceland, northern Europe and Russia.
Taxonomy This genus currently contains five described species. This genus traditionally contained the four species however specimens collected from the Kara Sea show that they form a monophyletic group. This group was described in 2026 as Cylichnoides karaensis.Elena Chaban, Dimitry Schepetov, Maria Stanovova, Natalia Zhuravliova, Alexei Mirolyubov, Irina Ekimova, Integrative analysis of gastropod molluscs of the genus Cylichnoides (Heterobranchia: Cephalaspidea: Eoscaphandridae) in boreal and Arctic seas, Zoological Journal of the Linnean Society, Volume 207, Issue 1, May 2026, zlag051, https://doi.org/10.1093/zoolinnean/zlag051
Species belonging to this genus are listed below: Cylichnoides densistriatus (Leche, 1878) Cylichnoides karaensis E. Chaban, D. Schepetov, M. Stanovova, N. Zhuravliova, A. Mirolyubov, I. Ekimova, 2026 Cylichnoides occultus (Mighels & C. B. Adams, 1842) Cylichnoides scalptus (Reeve, 1855) Cylichnoides validus (Leche, 1878)
References
Minichev, Yu. S. (1977). On the morphology and systematic of Cylichna (Gastropoda Opisthobranchia) from the region of Franz Joseph Land. In: A.N. Golikov, ed., Biocenoses of the shelf of Franz Joseph Land and the fauna of adjacent waters. [in Russian: Миничев Ю.С. 1977. К морфологии и систематике рода Cylichna (Gastropoda, Opisthobranchia) из районов Земли Франца-Иосифа. В: А.Н. Голиков, ред. Биоцено-щы шельфа Земли Франца Иосифа и фауна при-лежащих вод. Исследования фауны морей, 14(22): 428-434]. Issledovaniya Fauny Morei. 14(22): 428-434.
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