LYREIDINAE Guinot, 1993

van Bakel, Barry W. M., Ossó, Àlex & Téodori, Dominique, 2023, Rogueus belgodereae, a new raninoid crab (Crustacea: Brachyura: Raninoidea) from the Upper Palaeocene (Thanetian) of Southern France, with comments on early palaeocene decapod crustacean faunules, Palaeontologia Electronica (a 45) 26 (3), pp. 1-16 : 8-9

Subfamily LYREIDINAE Guinot, 1993

(= ROGUEINAE Karasawa, Schweitzer, Feldmann and Luque, 2014 )

Genus ROGUEUS Berglund and Feldmann, 1989

Type species. Rogueus orri Berglund and Feldmann, 1989 , by monotypy.

Species included. Rogueus orri , R. robustus Collins and Jakobsen, 1996 , and R. belgodereae n. sp.

Remarks. Remarks on Rogueus , and on the type species Rogueus orri , were made by Van Bakel et al. (2012, p. 84, 85). These authors considered

Rogueus an early member of the subfamily Lyreidinae and noted the similarity of the front with that of Marylyreidus Van Bakel, Guinot, Artal, Fraaije and Jagt, 2012 .

Karasawa et al. (2014, p. 227) stated in their cladistic analysis that Rogueus lacked the ambiguous character of a well-developed outer orbital spine. We observe that the type species shows a distinct outer orbital spine ( Berglund and Feldmann, 1989, figures. 2.1; 2.2) as well as the other two included species (see above). Also, Karasawa et al. (2014, p. 227) stated that Rogueus exhibits an autapomorphic character, namely an anterolateral spine with a subspine, and stated that therefore a new monogeneric subfamily should be erected for Rogueus . However, subspines are a commonly observed character in Raninoidea : in Amphoranina Nyborg, Pasini, Garassino, Van Bakel, Vega and Nyborg, 2020 ; Doraranina Gustafson, Nyborg and Van Bakel, 2019 ; Ranina Lamarck, 1801 ; Pseudorogueus Fraaye, 1995 ; Bicornisranina Nyborg and Fam, 2008 ; and Rogueus this character is present. The overall appearance of Bicornisranina and Pseudorogueus are similar to that of Rogueus , however, they are assigned to Raninoidinae Lőrenthey in Lőrenthey and Beurlen, 1929 (Nyborg and Fam, 2008; Van Bakel et al., 2012; Karasawa et al., 2014) based on the diagnosis of in particular the orbitofrontal margin.

The unique character set ascribed to the Rogueinae (“(...)wide fronto-orbital width, a bifid rostral tip, the lack of intra-orbital spines and orbital fissures, and possession of a lyreidine-like sternum”) are all plesiomorphic characters in the Lyreididae (Van Bakel et al., 2012, p. 75) and the genus fits well within Lyreidinae ; therefore, we consider Rogueinae synonymous to Lyreidinae . Basal members of the Lyreidinae appear to have a wide orbitofrontal margin (Van Bakel et al. 2012), which accounts for Rogueus . Rogueus does not show a basal condition of the thoracic sternum as in Marylyreidinae ; the anterior extensions of thoracic sternite 4 are well developed and connected to pterygostome (sternum/pterygostome junction).

Collins and Jakobsen (1995, p. 64) discussed that the earlier age of the Danish species suggested a European origin and subsequent westerly migration of the genus. The new material described herein is slightly younger than R. robustus from Denmark and suggests that the genus was widespread in Europe in the Palaeocene.