Cenomanocarcinus cristatus ( Jux, 1971 )
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publication ID |
https://doi.org/ 10.5281/zenodo.4651166 |
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persistent identifier |
https://treatment.plazi.org/id/87178784-FFBE-FFC5-1AC4-FE65FBDA62E7 |
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treatment provided by |
Felipe |
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scientific name |
Cenomanocarcinus cristatus ( Jux, 1971 ) |
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Cenomanocarcinus cristatus ( Jux, 1971) ( Fig. 7 View FIG )
MATERIAL EXAMINED. — Afghanistan, upper Campanian : holotype, female 47 × 46 mm (without lateral spines) ; the specimen was squeezed transversely and deformed, as shown by the asymmetrical carapace ( GIK 538 ) ( GIK 536 in Jux 1971) .
Remarks
Jux (1971: 157, fig. 2, pl. 17) established a new genus, Hasaracancer (type species H. cristatus Jux, 1971 ) from the upper Campanian of Afghanistan, described as a raninid and thus assumed to be a podotreme crab. It was transferred to the Necrocarcinidae by Schweitzer et al. (2003a: 32, 33; 2004: 90, table 1) and Schweitzer & Feldmann (2005: tables 4, 5, 7), a heterotreme family according to those authors. The elongate and narrow carapace ( Fig. 7B View FIG ) is obviously deformed, without lateral spines preserved. The dorsal surface bears an axial ridge with fairly large tubercles and two long lateral ridges lined by small, close-set tubercles; the orbits are small, closely spaced. The superficial resemblance in carapace outline and ornamentation between H. cristatus and Necrocarcinus renfroae Stenzel, 1945 ( Stenzel 1945: pl. 41, fig. 13) ( Fig. 8B, D View FIG ) is likely due to a similar style of deformation. The mxp3 and sternum are absent in H. cristatus while the abdomen ( Fig. 7A View FIG ) apart from the telson is entirely preserved. The abdomen is extremely wide (even for a female) and unfolded (at least somites 1 to 4 in line with the carapace, thus dorsal; only a slight folding posteriorly; with somites 1-6 of the same width, 2-5 being conspicuously inclined laterally; somite 1 very short, somite 6 strongly developed). The curved lateral parts were compared to pleurae by Jux (1971: 161), who placed Hasaracancer with the Raninoidea , close to Notopocorystes McCoy, 1849 . The incompletely folded
and partially dorsal abdomen of H. cristatus is the possible product of the holotype being an exuvia, rather than a corpse. The abdomen is interpreted to have been normally folded underneath the carapace, as in other species of Cenomanocarcinus . Despite the presence of a near complete cervical groove which distinctly delineates the anterior part of the carapace in H. cristatus , Hasaracancer is referred herein to Cenomanocarcinus .
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