Xanthosia, Bell, 1863

Charbonnier, Sylvain, Garassino, Alessandro & Pasini, Giovanni, 2012, Revision of Mesozoic decapod crustaceans from Madagascar, Geodiversitas 34 (2), pp. 313-357 : 313-357

“ Xanthosia ” robertsi Secrétan, 1982 ( Fig. 18J, K)

Xanthosia elegans Secrétan, 1964: 178-182 , pl. 20, figs 4-6 [non Roberts, 1962]. — Bishop 1991: 311.

Xanthosia robertsi Secrétan, 1982: 927-933 , 2 figs. — Schweitzer Hopkins et al. 1999: 80. — Guinot & Tavares 2001: 510, 512, 517. — Karasawa et al. 2008: 107. — Schweitzer et al. 2010: 131.

HOLOTYPE. — MNHN. F. R 03979.

TYPE LOCALITY. — Coupe de Berere I (gisement 161), Belo-sur-Thsirihibina, Menabe region, central Morondava Basin, Tulear Province.

TYPE AGE. — Early Campanian ( Anapachydiscus wittekindi and Eulophoceras jacobi zone).

DISCUSSION

Secrétan (1964: 178) described a single fragmentary carapace, as a new species of Xanthosia Bell, 1863 , X. elegans . As this name appeared to be preoccupied, the replacement name X. robertsi was later proposed by Secrétan (1982). However, as noted by Schweitzer Hopkins et al. (1999) despite superficial similarities of “ Xanthosia ” robertsi to the genus, numerous other features do not correspond to the diagnosis of Xanthosia , such as the single, large, lateral spine, carapace shape, and regions that differ from those of other species of Xanthosia . Schweitzer Hopkins et al. (1999) considered X. robertsi to be a portunid, rather than a species of Xanthosia . Currently, its systematic position is still uncertain. For now, in compliance with Schweitzer et al. (2010), we referer it to “ Xanthosia ” [sensu lato] until better-preserved specimens are available.

Section PODOTREMATA Guinot, 1977