Rogueus orri Berglund & Feldmann, 1989

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 : 85

Rogueus orri Berglund & Feldmann, 1989

Rogueus orri Berglund & Feldmann, 1989: 70 .

Remarks. Rogueus orri , described on the basis of 19 specimens from the middle Eocene of Oregon, U.S.A., comprising carapaces, chelipeds and the thoracic sternum ( Berglund & Feldmann 1989: 71, figs. 2.1–2.6) and originally referred to the family Raninidae , should be placed in Lyreididae . Bouchard (2000: 126, fig. 32a) was the first to recognised hook-like projections on episternite 5 in the paratype (USNM 430034) of Rogueus orri . The thoracic sternum clearly shows the projections of episternite 5, which are fairly long and slightly outwardly curved. No distal locking teeth (double peg) are discernible which is either a taphonomic feature or can be ascribed to the fact that the specimen illustrated was an adult female. Sternite 5 is broad, with lateral prolongations between P1 and P2, the coxae of which are widely separated ( Berglund & Feldmann 1989: 72, figs. 2.5, 2.6), these lateral extensions erroneously referred to as ‘episternum’ by these authors. Episternite 4 is diminutive, bounded by a distinct C-shaped suture; sternite 4 is tall, anteriorly widened and coupled to the recessed corner of the pterygostome. The mxp3 coxae are not preserved, but there is only little room for them because they were small. A crown is visible anterior to sternite 4. It is not clear if this represents only sternite 3, or fused anterior sternites. The orbitofrontal margin, which is wide as lyreidids go, is similar to that of Marylyreidus n. gen., notably with a single orbital fissure. The bifid triangular front resembles that of Bournelyreidus n. gen.

Berglund & Feldmann (1989: 72) claimed that the closest relative of Rogueus orri may have been Notopocorystes (Cretacoranina) fritschi ( Glaessner, 1929a) (here Cretacoranina fritschi , see above) as ‘based upon the strong similarity of the anterior margins and configuration of the sternal plastron’. The ventral characters of C. fritschi have never been described, nor illustrated, by Frič (1893: 105) or Glaessner (1929a: 155); we are not aware of any additional material described and illustrated since.