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 Orbitestella ponderi Linse, 2002 Fig. 5A Orbitestella ponderi Linse, 2002 : 82 , pl. 9a, figs. 9.1.1 65–68, pl. 9b, figs. 9.1.1 69–72 (protoconch and radula) Examined material. 1 an. and 13 sh. (MACN-In 40697). Description. Shell width to 0.7 mm (up to 1.04 mm according to Linse 2002 ); discoidal, with spire only slightly raised; delicate. Protoconch of 1.25 bulbous whorls. Teleoconch of up to 2 whorls, markedly convex in outline, with straight shoulder. Suture deep, slightly channeled. Surface white; sculptured with 19 to 24 strong, markedly prosocline, axial ribs per whorl; interspaces with numerous spiral threads. Aperture rounded, interior white. Umbilicus wide, rounded. Operculum rounded, multispiral; pale brown, translucent.