Thyroptera, Spix, 1823

Velazco, Paúl M., Gregorin, Renato, Voss, Robert S. & Simmons, Nancy B., 2014, Extraordinary Local Diversity of Disk-winged Bats (Thyropteridae: Thyroptera) in Northeastern Peru, with the Description of a New Species and Comments on Roosting Behavior, American Museum Novitates 2014 (3795), pp. 1-28 : 22-23

KEY TO THE SPECIES Of THYROPTERA

1. Disk at base of thumb clearly oval in outline (not round); ventral pelage bicolored or tricolored; both cusps of the second upper incisor perpendicularly arranged relative to the long axis of the toothrow…………….…………………………..………………..…………………2

1′. Disk at base of thumb nearly circular in outline; ventral pelage unicolored; both cusps on the second upper incisor obliquely arranged relative to the long axis of the tooth row..……………………………………………………………………………………………4

2. Forearm ≥ 35.0 mm; GLS ≥ 14.0 mm; ventral pelage bicolored; proximal portion of forearm sparsely haired; rostrum of equal length or longer than the braincase; accessory cusps on the third lower incisor absent or only faintly developed….……………………………….3

2′. Forearm ≤ 34.5 mm; GLS ≤ 13.5 mm; ventral pelage tricolored; proximal portion of the forearm densely haired; rostrum considerably shorter than the braincase; accessory cusps well developed on the third lower incisor…….…..…….…………….. Thyroptera wynneae

3. Ventral pelage distinctly frosted, individual hairs dark brown to blackish at the base with grayish-brown to whitish tips; calcar lacks lappets or only one faintly developed lappet is present; GLS ≤ 15.1 mm and ZB ≤ 7.7 mm ……………..……………….. Thyroptera devivoi

3′. Ventral pelage bicolored, not distinctly frosted; calcar has one well-developed lappet that project posterolaterally from the shaft of the calcar; GLS ≥ 15.2 mm and ZB ≥ 8.0 mm… ……………….……………………………………………………………….. Thyroptera lavali

4. Ventral pelage unicolored white or pale gray; proximal portion of forearm sparsely haired; large foramen ovale (0.50–0.65 mm)…………………….……………… Thyroptera tricolor

4′. Ventral pelage unicolored yellowish-brown (not white); proximal portion of forearm densely haired; small foramen ovale (<0.45 mm)……………………..……… Thyroptera discifera