Gastropods from the Burdwood Bank (southwestern Atlantic): an overview of species diversity Author Luca, Javier Di Author Zelaya, Diego G. text Zootaxa 2019 2019-01-10 4544 1 41 78 journal article 27685 10.11646/zootaxa.4544.1.2 2f89f82f-be57-45b4-ad3c-ed72a7647551 1175-5326 2618137 211842AA-6C98-425B-9377-1AF0DC78C893 Acteon biplicatus ( Strebel, 1908 ) Fig. 5B Odostomia biplicata Strebel, 1908 : 65 , pl. 1, figs. 9, 9a Actaeon biplicatus — Castellanos & Landoni, 1986 : 297 , fig. 13 Examined material. 1 an. and 38 sh. (MACN-In 40698). Description. Shell height to 5.5 mm ; elongate-conical, delicate. Protoconch large, smooth, of about 1.75 slightly convex whorls; transition to teleoconch poorly defined. Teleoconch with up to 4 whorls, slightly convex in outline; last whorl comprising about 70% of total shell height. Suture deep, slightly channeled. Surface brownish, with a pale band below suture; only sculptured with faint growth lines. Aperture ovate, interior pale brown; columella with two small folds, callus moderately thick, slightly expanded over the umbilical area.