Catonyx tarijensis ( Gervais and Ameghino, 1880 )

Miño-Boilini, AR & Zurita, AE, 2015, Dimorphism in Quaternary Scelidotheriinae (Mammalia, Xenarthra, Phyllophaga), Palaeontologia Electronica (Basel, Switzerland) 736 (1), pp. 1-16 : 6-7

Catonyx tarijensis ( Gervais and Ameghino, 1880)

( Figures 5.1-2 , 6.1-2 )

Referred material. CTES-PZ 7151 , partial skull ; CTES-PZ 1690 , posterior portion of the skull; FCS 96.I15/1/2, partial skull; FMNH P 14238, skull, mandible, left scapula, left and right humerus, ulna and radius, left femur; FMNH P 13733, partial skull ; MACN 1138 , posterior portion of the skull; MNPA-V 005769, skull and mandible; MNPA-V 005750 (former MUT 32 ), skull and mandible; MNPA-V 005766 (former MUT 298 ), skull and partial mandible; MNHN TAR 1260, holotype of Scelidodon tarijensis , partial skull and mandible associated; MNPA-V s/n (former MUT 166 ), skull and mandible associated; MNPA-V s/n (former MUT 446 ), partial mandible, with molariforms; MNPA-V s/n (former MUT 007 ), partial mandible, with molariforms; NRM-M 4444, skull and mandible; FMNH P 14243 ,

PALAEO- ELECTRONICA.ORG skull and mandible, portions of the postcranial; MD- 97-23, partial skull; MMP 3989, posterior portion of the skull; MMP 1267, complete skull, mandible nearly complete, humerus, ulna, radius, all in good state of preservation; PIMUZ A/V 0512, partial skull.

Description. The parasagittal crests originate in the nuchal crest and end at the level of the postorbital process of the frontals. In some specimens (FMNH P 14243, MNHN TAR 1260, MNPA-V 005750, MNPA 005766, MNPA-V 005769, MUT 166, MACN 1138, MMP 3989, NRM-M 4444, and CTES-PZ 7151), the sagittal crest has a high degree of development and is straight along all its extension, and diverges only in the most anterior part of the frontals ( Figure 5.1 ). In other specimens (FMNH P 13733, MD 97-23, PIMUZ A/V 0512, MMP 1267, and CTES-PZ 1690), the sagittal crest starts diverging at the level of the fronto-parietal suture and ends at the post-orbital narrowing, acquiring an "hourglass" shape. Finally, only two specimens (FMNH P 14238 and FCS 96.I15/1/2) show total absence of dorsal crests ( Figure 6.1 ).

Figures

FIGURE 5. Catonyx tarijensis. Skull and mandible in dorsal view. 1 and 2 FMNH P 14243. Scale bar equals 10 mm.

FIGURE 6. Catonyx tarijensis. Skull and mandible in dorsal view. 1 and 2 FMNH P 14238. Scale bar equals 10 mm.