New species of the until now monotypic buccinoidean genera Germonea and Drepanodontus are described from the southwestern Atlantic waters. These genera are only otherwise known from lower bathyal and abyssal depths of Scotia Sea. Germonea costulosa n. sp. collected near Namuncurá/Burdwood Bank in 681 to 785 m depth is the second known species of the genus characterized by distinctive regular ribs. In addition, Drepanodontus peonza n. sp., collected from the same area, is similar to the type species of this genus with two distinctive spiral cords along all whorls. The bathymetry of both new species is shallower than that of the already described species, at upper slope depths. Geographically the new species put both genera on both sides of the Antarctic convergence. Previous reports include D. tatyanae sharing this distribution rising some questions about the effectiveness of the Drake passage as a barrier.

在大西洋西南部水域描述了迄今为止单型 buccinoidean 属Germonea和Drepanodontus 的新物种。这些属只有在斯科舍海的较低深海和深海深度才能知道。Germonea costulosa n. sp. 在 Namuncurá/Burdwood Bank 附近收集的 681 至 785 m 深度是该属的第二个已知物种，其特征是独特的规则肋骨。此外，Drepanodotus peonzan. 从同一地区收集的 sp. 与该属的模式种相似，在所有轮毂上都有两条独特的螺旋线。两个新物种的水深比已经描述的物种在上坡深度浅。从地理上讲，新物种将两个属都放在南极汇合的两侧。以前的报告包括D. tatyanae分享这种分布，引发了一些关于 Drake 通道作为屏障的有效性的问题。