Rhipidomys emiliae (J.A. Allen 1916 )

Lanes, Rayque De Oliveira & Bonvicino, Cibele Rodrigues, 2023, Reevaluation of Rhipidomys emiliae (J. A. Allen 1916) and description of a new Rhipidomys (Rodentia: Cricetidae) species from Amazonia and Cerrado, Zootaxa 5346 (5), pp. 581-597 : 589

Rhipidomys emiliae (J.A. Allen 1916)

Synonyms

Oecomys emiliae J. A. Allen, 1916 c:525 ; type locality “ Rio Mojú , Pará, Brazil.”

Oryzomys [(Oecomys)] emiliae: Ellerman, 1941:358 ; name combination.

Rhipidomys emiliae: Goodwin, 1953:306 ; first use of current name combination.

Holotype: AMNH 37495 , subadult male, skin only; collected by E. Snethlage at “Rio Mojú, Pará, Brazil ” on 28 February 1914 (specimen ex Museu Paraense Emílio Goeldi , Belém).

Diagnosis: median sized Rhipidomys species (Total length ~ 275.75 mm; ONL ~ 32.61 mm), with brown to light orange dorsal pelage with cream venter. Tail (~ 144.5 mm) is longer than head-body length (HB~ 131.25 mm) and ends in a tuft. The feet are wide, with a blackish dorsal metatarsal stain in juveniles and a grayish color in adult specimens. The interorbital region is anteriorly convergent. The subsquamosal foramen is narrow and elongated in adults, the hamular process is long, and the post-glenoid foramen is large (elongated). Incisive foramen rounded on the sides, with a drop shape. Mesopterygoid fossa extends beyond the plane of third upper molar, the roof sphenopalatine vacuities that ranged from small slits to slightly larger openings. Posterolateral palatal pits of medium and small sizes at the edge of the mesopterygoid fossa ( Fig. 2 ). In the mandible, the angular process ends in the same position of the end of condyloid process.

Figures

FIGURE 2. Posterior region of the skull of (A) Rhipidomys. sp. nov. MN 73990, (B) R. ipukensis MN 73741, and (C) R. emiliae MN 81709 showing detail of subsquamosal foramen (ssf), hamular process of squamosal (hps), and post-glenoid foramen (pgf).