Ypsilocucumis, Panning, 1949

Luna-Cruz, Ana K. & Hendrickx, Michel E., 2020, Rediscovery of the deep-water species Ypsilocucumis californiae Massin & Hendrickx, 2011 (Echinodermata; Holothuroidea; Ypsilothuriidae) in western Mexico, Zootaxa 4742 (1), pp. 139-148 : 144

Key to species of Ypsilocucumis

1 Size of the ossicles 200–1466 µm; maximum two layers of ossicles covering the body; body with two forms of ossicles: tables with an eccentric spire and smaller plates without spire; tentacles with perforate curved bars, from thin to thick. Geographical and bathymetric distribution: eastern Pacific (NW Mexico) ( Fig. 1 ); depth range, 377 to 1270 m ......................................................................................... Y. californiae Massin & Hendrickx, 2011

- Ossicles> 2000 µm; several layers of ossicles covering the body; apparently a unique form of ossicles in body wall, table-like with an eccentric spire; tentacles with wide perforated plates ( Théel 1886). Geographical and bathymetric distribution: western tropical Atlantic ( Fig. 1 ); depth range, 64 m (unpublished records of Harvard Museum of Natural History) to 2654 m (unpub- lished records of Smithsonian National Museum of Natural History)........................ Y. asperrima ( Théel, 1886)

Figures

FIGURE 1. Sampling stations where species of Ypsilocucumis have been reported. Ypsilocucumis californiae Massin & Hendrickx, 2011: ★ type locality (TALUD VI, St. 26); ● previous records (TALUD VIII, Sts. 11, 16; TALUD X, St. 3); ○ new records presented herein (TALUD XV, St. 20; TALUD XVI-B, Sts. 5, 7). Ypsilocucumis asperrima (Théel, 1886): ☆ syntypes localities; ■ records of MCZ; ▲ records of USNM.