Acirsa

solid shell, Outer lip thin; broad axial low ribs; with an indistinct basal cord, basal disc lacking. Spiral sculpture of incised groves usually present.

Genotype:

Genotype, Scalaria borealis Beck= Turritella costulata Mighels and Adams, monotypic. Type species: Mörch included only one species Scalaria borealis Beck, which is a nomen nudum, and as synonyms «Scalaria eschrichti Holb. & Moll.» and «S. undulata Sow.». All type designations involving the names borealis Beck and costulata Mighels & Adams are therefore invalid, and Scalaria eschrichti Holböll in Möller, 1842 is here formally designated as type spe-cies.

Literature cited:

Beechey, D. (2008). Shells NSW -Epitonium_tacitum. https://seashellsofnsw.org.au/Epitoniidae/Pages/Epitonium_tacitum.htm
Bouchet, P. & Warén, A. (1986). Revision of the Northeast Atlantic bathyal and abyssal Aclididae Eulimidae, Epitonidae (Mollusca, Gastropoda).. Bollettino Malacologico.. suppl. 2. pp: 297-576
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). pp: 001-188
Clench, W. J. & Turner, R. D. (1952). The Genera STHENORYTIS, CIRSOTREMA, ACIRSA, OPALIA and AMAEA in the Western Atlantic. Jonsonia. 2(19-32). pp: 221-355
Dushane, H. (1974). The Panamic-Galapagan Epitoniidae. The Veliger. 16 (Sup. 14). pp: 1-84
Dushane, H. (1979). The Family Epitoniidae in the Northeastern Pacific. The Veliger. 22(2). pp: 91-134
Kilburn, R.N (1985). The family Epitoniidae (Mollusca: Gastropoda) in southern Africa and Mozambique. Annals of the Natal Museum. 27(1). pp: 239-337
Nakayama, T. (2003). A Review of Northwest Pacific Epitoniids. Monographs of Marine Mollusca. 6. pp: 50