Heus Bishop & Williams, 2000

Van Bakel, Barry W. M., Guinot, Danièle, Artal, Pedro, Fraaije, René H. B. & Jagt, John W. M., 2012, A revision of the Palaeocorystoidea and the phylogeny of raninoidian crabs (Crustacea, Decapoda, Brachyura, Podotremata) 3215, Zootaxa 3215 (1), pp. 1-216 : 83

Genus Heus Bishop & Williams, 2000

Heus Bishop & Williams, 2000: 290 .

Type species. Heus foersteri Bishop & Williams, 2000 .

Remarks. Only the carapace of Heus foersteri (see Bishop & Williams 2000: 290, fig. 4), from the upper Campanian of South Dakota and Colorado, U.S.A., is preserved. This reveals a unique set of characters: rostrum broad and narrow, strongly sulcate, with a keel that extending onto the carapace; oval swellings on epigastric and protogastric regions; cervical groove discernible; lateral margins with but a single, diminutive spine. These characters distinguish it easily from Bournelyreidus n. gen. Re-examination of the type series of B.? oaheensis (see above) is needed to decide if it might also be better accommodated in Heus .

The wide carapace, with clearly concave posterior (divergent) portions of the posterolateral margins, weakly armoured anterolateral margin, and swellings on the anterior carapace surface are somewhat similar to the configuration in Symethis Weber, 1795 (see below). The orbitofrontal construction, however, makes its placement in the Lyreidinae more likely.