Abyssophthalmus, Schweitzer and Feldmann, 2009 d

Klompmaker, Adiël A., Starzyk, Natalia, Fraaije, René H. B. & Schweigert, Günter, 2020, Systematics and convergent evolution of multiple reef-associated Jurassic and Cretaceous crabs (Decapoda, Brachyura), Palaeontologia Electronica (a 32) 23 (2), pp. 1-54 : 15

Genus ABYSSOPHTHALMUS Schweitzer and Feldmann, 2009d

Type species. Prosopon spinosum von Meyer, 1842 , by original designation.

Included species. Abyssophthalmus adinae Schweitzer, Feldmann, Lazăr, Schweigert, and Franţescu, 2018 ; A. bellaii (Crônier and Boursicot, 2009) , as? Nodoprosopon ;? A. dzhafarberdensis (Ilyin, 2005) comb. nov., as Nodoprosopon ; A. hebes (von Meyer, 1835) , as Prosopon ; A. mainense (Crônier and Boursicot, 2009) , as? Nodoprosopon ; A. mirus (Moericke, 1889) , as Prosopon ; A. schultzi Schweitzer and Feldmann, 2009a ; A. spinosus (von Meyer, 1842) , as Prosopon ; A. stotzingensis (von Meyer, 1856) , as Prosopon .

? Abyssophthalmus dzhafarberdensis (Ilyin, 2005) comb. nov.

Figure 7

2005 Nodoprosopon dzhafarberdensis Ilyin , p. 171, fig. 35C, pl. 7.3.

Description. See Ilyin (2005, p. 171-175).

Remarks. Nodoprosopon dzhafarberdensis Ilyin, 2005 , from the Tithonian-Berriasian of Crimea, was questionably assigned to Prosopon by Schweitzer and Feldmann (2009d), but a subsequent paper indicated that placement into a longodromitid genus such as Planoprosopon or Abyssophthalmus may be better (Schweitzer et al., 2018), to which we concur. Schweitzer and Feldmann (2009d, p. 101) proposed three differences between the two genera: Abyssophthalmus would be less dorso-ventrally compressed, exhibit deeper orbits, and possess stronger orbital ornamentation. Only the first difference can be used here because the depth of the orbits and ornamentation on the orbital rim are difficult to observe in N. dzhafarberdensis . Based on a higher resolution image than the one published in Ilyin (2005) ( Figure 7 ), we tentatively ascribe the taxon to Abyssophthalmus because the dorsal surface does not appear to be very compressed. We did not use Ilyin’s figure 35C for comparison because this drawing does not appear to accurately represent the specimen.

Figures

FIGURE 7. Holotype specimen of the crab?Abyssophthalmus dzhafarberdensis (Ilyin, 2005) comb. nov. from the Late Jurassic to Early Cretaceous (Tithonian-Berriasian) of Crimea. Scale bar width equals 5.0 mm.