Orithopsis Carter, 1872

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 : 68

Genus Orithopsis Carter, 1872

Orithopsis Carter, 1872: 530 .

Type species. Necrocarcinus tricarinatus Bell, 1863 , by monotypy (= Orithopsis bonneyi Carter, 1872 ).

Species included. Orithopsis angelica ( Fraaije, 2002) ( Fig. 22G ), O. carinata ( Feldmann, Tshudy & Thomson, 1993) , O.? iserica (Fritsch in Fritsch & Kafka, 1887), O.? youngi ( Bishop, 1983c), O. siouxensis ( Feldmann, Awotua & Welshenbaugh, 1976) , O.? transiens (Fritsch in Fritsch & Kafka, 1887), and O. tricarinata ( Bell, 1863) .

Remarks. Schweitzer et al. (2010: 82) listed only O. bonneyi and O. tricarinatus [sic] for Orithopsis . The synonymy of these two taxa had previously been, however, discussed at length by Wright & Collins (1972), Collins (2003) and Guinot et al. (2008); our examination of the types of both taxa substantiates that view. Larghi (2004: 530) stated that Orithopsis was one of the genera most similar to Corazzatocarcinus and separated them by the ‘marked hexagonal outline and distinct epibranchial lobes’ of Orithopsis . Reduction of both P4 and P 5 in Corazzatocarcinus sets it apart from Orithopsis and excludes it from Orithopsidae .

Figures

FIGURE 22. A, B, D, E, Orithopsis tricarinata (Bell, 1863) (Orithopsidae), NHM In.30297 (female), Albian, Folkestone (southern England); ventral view; posterior view showing abdomen; detail of abdomen, anterior portion of thoracic sternum and bases of pereiopods, and detail of abdomen and pereiopods in posterior view; C, F, Orithopsis tricarinata (Bell, 1863), IRScNB unnumbered [Van Straelen Collection; indeterminate sex], upper Albian Cambridge Greensand, Cambridge (southern England); dorsal view of carapace, and ventral view showing anterior part of thoracic sternum; G, Orithopsis angelicus (Fraaije, 2002), MAB k. 2548 (holotype; indeterminate sex), upper Maastrichtian, Maastricht, the Netherlands; dorsal view of carapace (composite photograph). 1, 2, 3, 4, thoracic sternites 1, 2, 3, 4; 4/5, thoracic sternal suture 4/5; a2, a3, a4, a5, a6; abdominal somites 1, 2, 3, 4, 5, 6; cx1, cx2, cx3, cx4, cx5, P1-P5 coxae; e4, e5, episternites 4, 5; g1, gynglyme for P1 coxa. Scale bars: 5mm.