New records of Palaeocorystoidea from the Iberian Peninsula and remarks on the taxonomic significance of the posterior margin of Cenomanocarcinus Van Straelen, 1936 and Hasaracancer Jux, 1971 (Decapoda; Brachyura; Cenomanocarcinidae) Author Ossó, Àlex text Zootaxa 2017 4303 2 273 283 journal article 32522 10.11646/zootaxa.4303.2.7 2a5c89e9-de41-47fc-8d38-c1a10ae82c41 1175-5326 840956 99DB2319-498E-4A8B-BE10-12B53E2B7C9A Cenomanocarcinus sp. 1 ( Fig. 2 ) Cenomanocarcinus sp. Ossó et al. 2015 : 241 , t. 1. FIGURE 2. Cenomanocarcinus sp. ( sp. 1 ), From tardefurcata Biozone of Escucha Formation, early Albian. Traiguera (Castelló, Spain). MGB 78174, dorsal view of carapace. Abbreviations: ebs, epibranchial spines; pebs, post-epibranchial spine. Scale bar equal to 10 mm. Locality and horizon. Traiguera (Baix Maestrat, Castelló, Spain), Leymeriella tardefurcata Biozone, Escucha Formation , early Albian. Material examined and measurements (in mm). One incomplete specimen embedded within siliciclastic matrix, MGB 78174: width (from the basis of epibranchial spine) = 50 ( 25x2 ). Description. Relatively large carapace, wider than long, cuticle smooth, appears to be subhexagonal, bearing three longitudinal ridges, one axial composed by the meso-, meta- and urogastric tubercles and the cardiac tubercle, and two branchial ridges. Orbito-frontal, anterolateral and posterior margin not preserved. Epibranchial spine subtriangular, strong, appears to be long. Posterolateral margin slightly concave, weakly rounded in cross section, post-epibranchial spine subtriangular, acute. Protogastric region swollen, two rounded tubercles aligned transversally; meso- and metagastric region defined by elongated tubercles, forming the axial ridge, slightly depressed by the cervical groove; urogastric region ridged longitudinally. Cardiac region narrow, ridged elongated. Intestinal region flattened, depressed. Hepatic region not completely preserved. Epibranchial region with a weak sigmoidal ridge that starts with a strong tubercle and ends at the level of last anterolateral tooth (epibranchial spine); two small tubercles at mid-length. Mesobranchial region defined by a coarse longitudinal ridge with blunt edges, depressed posteriorly and ending in a prominent broken spine. Metabranchial region depressed. Shallow branchiocardiac groove. Remarks. The general appearance of the Traiguera specimen of Cenomanocarcinus , falls into the first morphological group reported by Ossó et al. (2015 : 241) by its coarse and parallel branchial ridges. In particular, it recalls in many aspects his coeval C. cantabricus from the Albian of Cantabria ( Spain ) and the Cenomanian C. boedekeri from the Cenomanian of Texas (USA), in having coarse axial and branchial ridges, presence of a postepibranchial tooth, similar pattern of epibranchial ridge and possibly a long epibranchial tooth. Nevertheless, the Traiguera specimen is incompletely preserved and lacks diagnostic characters such as: fronto-orbital, anterolateral, and posterior margins. The absence of those features impedes a specific assignation of this specimen or if it had been the case, the proposal of a new species for it.