Umbilibalcis Bouchet & Waren 1986

Genus Umbilibalcis Bouchet & Warén, 1986 Type species. Aclis (supranitida Wood var. ?) lata Dall, 1889b, by original designation, Recent; Caribbean. Diagnosis. See Bouchet & Warén (1986: 444). Remarks. Umbilibalcis Bouchet & Warén, 1986 comprises three species, all from the North Atlantic: Um-bilibalcis crassula Bouchet & Warén, 1986, U. lata (Dall, 1889b) and U. subumbilicata (Jeffreys, 1883) (Bouchet & Warén 1986). The present records of Umbilibalcis lata represents the first record of the the genus in the southwestern Atlantic. The present genus resembles Niso by the presence of microscopic sculpture of axial lines on the protoconch and teleoconch, but has a more rounded base and edge of the umbilicus, and lacks color on the teleoconch. Furthermore, the aperture of Umbilibalcis is more rounded, while in Niso it is usually rhomboid.
Published as part of Souza, Leonardo Santos De, Pimenta, Alexandre Dias & Barros, José Carlos Nascimento De, 2021, Revision of the deep-sea Eulimidae (Gastropoda, Caenogastropoda) from off Northeast Brazil, pp. 451-504 in Zootaxa 4927 (4) on pages 492-493, DOI: 10.11646/zootaxa.4927.4.1, http://zenodo.org/record/4542923
{"references":["Bouchet, P. & Waren, A. (1986) Revision of the northeast Atlantic bathyal and abyssal Aclididae, Eulimidae, Epitoniidae (Mollusca, Gastropoda). Bollettino Malacologico, Supplemento 2, 299 - 576. https: // doi. org / 10.5962 / bhl. title. 140762","Dall, W. H. (1889 b) Reports on the results of dredgings, under the supervision of Alexander Agassiz, in the Gulf of Mexico (1877 - 78) and in the Caribbean Sea (1879 - 80), by the U. S. Coast Survey Steamer ' Blake'. Bulletin of the Museum of Comparative Zoology, 18, 1 - 492, pls. 10 - 40."]}