Undercover speciation of wentletraps (Caenogastropoda: Epitoniidae) in the Southwestern Atlantic Author Zelaya, Diego G. Author Güller, Marina text Zootaxa 2017 4286 1 41 69 journal article 32762 10.11646/zootaxa.4286.1.2 dddc215c-61ae-484e-bc8e-1314354620b2 1175-5326 828294 3B62E1C2-79C6-4A14-9F6D-80D8872118FA “ Cirsotrema ” georgeanum nomen novum ( Figure 10 ) Scalaria fenestrata Strebel, 1908 : 63 –64, pl. 4, fig. 61a–d ( non Meneghini in de Stefani, 1875 nor Wöhrmann, 1889) Cirsotrema fenestrata : Powell, 1951 : 114 ; Zelaya, 2005 : 121 Type locality. 54°11’ S 36°18’W , Cumberland Bay , South Georgia 252–310 m . FIGURE 10. “ Cirsotrema ” georgeanum new name, shell. A. Syntype of Epitonium fenestratum (SMNH type-918). B, C. Syntype of Epitonium fenestratum (ZMH 3139). C. Detail of teleoconch sculpture at the suture. Scale bars: A, B = 10 mm; C = 2 mm. Type material. Two syntypes (one syntype at SMNH type-918: Fig. 10 A; the other syntype at ZMH 3139: Fig. 10 B, C). Known distribution. Only known from South Georgia. Etymology. The name of the species refers to its provenance. Remarks. Scalaria fenestrata Strebel, 1908 appears at present as a junior (primary) homonym of Scalaria fenestrata Meneghini in de Stefani, 1875 and Scalaria fenestrata Wöhrmann, 1889 . Due to the above, “ Cirsotrema ” georgeanum is here proposed as a replacement name for Strebel’s species. In shell morphology, “ Cirsotrema ” georgeanum resembles “ Cirsotrema ” magellanicum ; both species reach large sizes, and are sculptured with widely separated, lamellate axial ribs, with low but strong spiral elements in the interspaces of axial sculpture, and with a prominent spiral cord at the base. In fact, Brown & Neville (2015) suggested that both are probably synonyms. However, “ Cirsotrema ” georgeanum differs from “ Cirsotrema ” magellanicum by being slender, with whorls separated by a deeper suture, axial ribs with prominent coronations, and by lacking the auriculate peristome that is present in “ Cirsotrema ” magellanicum . Given these differences, both taxa are here regarded as distinct.