Boana dentei ( Bokermann 1967 )

Marinho, Pedro, Costa-Campos, Carlos Eduardo, Pezzuti, Tiago L., Magalhães, Rafael F., Souza, Marcos R. D., Haddad, Célio F. B., Giaretta, Ariovaldo A. & De Carvalho, Thiago R., 2020, The Amapá treefrog Boana dentei (Bokermann, 1967): diagnosis and redescription (Hylinae: Cophomantini), Journal of Natural History 54 (15 - 16), pp. 971-990 : 975-978

Redescription of Boana dentei ( Bokermann 1967)

Diagnosis

(1) Male SVL = 34.4–37.5 mm, female SVL = 45.9–49.0 mm ( Table 1); (2) basal webbing between fingers II–III and III–IV, vestigial between fingers I–II; (3) calcar absent, conical tubercle on heel present on one leg or completely absent ( Figure 1 ); (4) dorsal colouration varying from light grey to light brown in males, darker shades of grey and brown in females. Both males and females have broad transverse bands and dark-brown irregular spots on dorsum ( Figure 2 ); (5) in life, flank light grey or cream white, usually with black irregular spots extending from groin to posterior surface of forelimb; (6) dorsal surface of thigh, tibia, and foot covered with darkbrown cross bands; (7) posterior surface of thigh cream or pale brown with irregular black spots or blotches; (8) ventral surface of body whitish cream or yellowish with

dentei at the type locality (Serra do Navio, Brazilian state of Amapá) and its

holotype (originally WCAB 35880 ; now MZUSP 74195 ) . Data are given as

mean ± SD (range). brown dots; (9) foot webbing: I (2–2 +)––(2 − –3) II (1 − –2 +)––(2 − –3 +) III 2 1/2 ––(3–3 1/3) IV (2 − –3 +)––(1 − –2 1/2) V; (10) in life, iris cream-coloured with upper yellow horizontal band; (11) presence of an enlarged prepollex in males, covered by skin; (12) nuptial pad absent; (13) subarticular tubercles rounded; (14) supranumerary tubercles inconspicuous; (15) mental gland absent; (16) snout truncate from above and rounded to vertical in profile; (17) vocal slit wide, extending laterally from under the tongue to lower jaw; (18) dentigerous process of vomers slightly curved posteriorly, positioned posterior to the choanae, well separated, bearing 8–14 vomerine teeth; (19) green bones present in males; (20) tadpole with stripes regularly spaced along the ventral fin and in the posterior third of the dorsal fin; (21) LTRF 2(1,2)/4(1); (22) presence of flaps with labial teeth laterally in the oral disc; (23) presence of a small posterior gap in the marginal papillae; (24) vocal repertoire composed of three distinct types of pulsed notes; (25) advertisement call (referred herein as note A) as relatively shortlasting (0.06–0.09) note with dominant frequency ranging from 1.9 to 2.9 kHz.

Comments on the holotype

WCAB 35880 by original designation (now MZUSP 74195): female from Serra do Navio, state of Amapá, northern Brazil.

Specimen fairly preserved, with hands and feet partially closed. A few transverse stripes visible on dorsum, more evident anteriorly; and a few dark-brown blotches. Flank and posterior surface of thigh dark-brown blotched on a whitish cream background colour. Throat and chest dark-spotted, belly immaculate. Belly and thigh granular/areolate. Ventral surface of hand and foot, and posterior surface of tarsus smooth. Sub-articular tubercles rounded. Enlarged prepollex absent. Foot webbing formula I 2–2+ II 1 1/2 – 2 1/2 III 1+ – 2− IV 2 1/2 – 1 1/2 V. Webbing between fingers vestigial. Vomerine teeth in two angled, straight ridges with a short gap, between and posterior to choanae (number of teeth not quantified). Supratympanic fold from posterior corner of eye to base of the arm. Snout truncate from above, rounded to vertical in profile. Calcar on heel and tarsal fold absent. Morphometric traits are given in Table 1.

Life colours

Colouration is suggestive of being sexually dimorphic, based on a limited sample size of individuals (see Figure 2 for photographs of one male and one female). Dorsal colouration of males is greenish yellow with two shades of light brown sometimes with dark-brown spots on dorsum. Throat, chest, and anterior belly varying from white to cream. Although granular, posterior belly translucent, stained in yellow laterally and some granules varying from cream to light orange. A poorly defined, narrow mid-dorsal longitudinal line of variable extension along body length is mostly present (absent in CFBH 43461 and CFBH 43666). Ventral surface of hand and hind limb mostly bright yellow. Posterior surface of thigh barred or spotted in black and silvery with tints of yellow, uniformly bright yellow posteroventrally. Flank with the same contrasting colour of posterior thigh, but spotted rather than barred. In females, dorsal colouration has two shades of hazel brown (dark brown spots on dorsum is present only in female CFBH 43261). Posterior surface of thigh is barred solid black and bright light blue, solid black posteroventrally. Flank with the same colours, but with dark-coloured, partially fused blotches rather than vertical bars. Brown dots on mental region, except vocal sac in males, in females, dots are distributed along the throat, extending posteriorly to anterior belly. Throat, chest, and belly mostly white. Posterior and lateral belly weakly translucent interspersed with granules. Ventral surface of hand dark-coloured, lighter along the digits. Green bones in the male ( Figure 2b ), white or not visible in the female ( Figure 2e ).

Figures

Figure 1. Dorsal and ventral views of topotypes of Boana dentei. (a–b) Male CFBH 43260: SVL = 35.5 mm; (c–d) Female, CFBH 43261: SVL = 45.9 mm; (e) Detail on the heels (right heel with a conical tubercle, which is absent on left heel) of the male AAG-UFU 6416: SVL = 35.1 mm. Scale bars = 10 mm.

Figure 2. Life colours in adult topotypes of Boana dentei. (a–c) Male,CFBH 43260:SVL = 35.5 mm; (d–f) Female, CFBH 43261: SVL = 45.9 mm.