Molossus aztecus Saussure, 1860

Molossus aztecus Saussure, 1860 View in CoL

Summary of captures.

Three females ( CMARF 2147–2149) and two males ( CMARF 2150 and 2151).

External measurements and weights.

Females: TLB: 105.00 (103.00–107.00), TL: 40.66 (38.00–44.00), LHL: 6.33 (6.00–7.00), EL: 11.00 (10.00–12.00), W: 11.33 (10.00–12.00). Males: TLB: 110.00 (110.00–110.00), TL: 40.44 (38.89–42.00), LHL: 6.00 (6.00–6.00), EL: 12.30 (12.00–12.60), W: 12.50 (12.00–13.00).

Morphological description.

Dorsal pelage with a uniform chocolate brown color and shorter at the shoulders ( 2–3 mm). Ventral fur is slightly bicolored, with the basal portion of hairs chocolate brown and the tips varying between dark brownish and black shade.

Skull with an inflated rostrum and a rounded braincase. Infraorbital foramen opens laterally in frontal view. Upper incisors spatulated. Occipital complex with a rectangular shape (Fig. 10 View Figure 10 ). Canines projected anteriorly. The nasal process in males is well-developed. Basioccipital pits moderately depth. Lambdoidal and sagittal crests well-developed. Mastoid process oriented ventrally in posterior view. The mandible has a developed angular process and a pair of bilobed incisors. Some skull measurements are shown in Table 2 View Table 2 .

Identification.

The unicolored dorsal pelage, the infraorbital foramen opens laterally in frontal view, the upper incisors spatulated, and the rectangular-shaped occipital complex differentiate the individuals of this species from their morphologically closest related congeners: Molossus coibensis J. A. Allen, 1904 , M. currentium O. Thomas, 1901 , and M. molossus (Pallas, 1766) ( Gregorin et al. 2011; Loureiro et al. 2018 a, 2018 b).