Calagrassor zephyrus = Eosipho zephyrus Fraussen, Sellanes and Stahlschmidt, 2012: 33-37, figs 1-10, 13, 14, 17-21. Calagrassor zephyrus - Kantor et al. 2013:2192. TYPE MATERIAL - Holotype in MNHNCL-6677 and 3 paratypes MNHNCL-6677 and MNHNCL-6679-6680, paratype MNHN IM-2000-24775, paratype KBIN IG.31980, MT.2569, and 23 paratypes in private collections (KF, PS, JS). (as listed below).
TYPE LOCALITY-Southern Chile, Chiloé, around 42°S, upper continental slope, in 500 m.
DISTRIBUTION-Known only from the type material from the upper continental slope of southern Chile, between 36° and 47° S; alive in 497-606 m. Calagrassor zephyrus is the single species known to us from the eastern Pacific. The species is possibly associated with methane seeps. No detailed habitat data are recorded but two of the three localities (off Concepción and off Peninsula Taitao) are menthane seep areas. Shells of live-collected specimens are covered with a thick, unidentified sponge-like mass.
REMARKS - Calagrassor zephyrus is characterized by its oval shape with a short spire, the convex teleoconch whorls, the weak spiral sculpture of flat cords and narrow interspaces, the broad, blunt protoconch with whorls increasing rapidly in size, the greenish, rather smooth periostracum and the small adult size. The radula is atypical for Cominellinae with an additional, small third cusp on the lateral teeth (Fraussen et al. 2012: 34, 35, figs 19-21). The presence of an additional median cusp in Cominellinae is known in Manaria lirata and M. fluentisona, and in Drepanodontus Harasewych & Kantor, 2004 (Harasewych & Kantor 2004: 7, 12, figs 36-40) in the Buccinulinae. The sculpture is unusually variable for the genus; spiral sculpture is present or absent on the adapical portion of the last whorl and the number of axial ribs ranges from 18 to 28 on the penultimate whorl. Manaria brevicaudata shows a similar wide range of variation in the presence or absence of spiral sculpture but differs in its more slender shape and its much larger adult size.