Hyloscirtus elbakyanae Varela-Jaramillo, Streicher, Venegas & Ron, 2025, sp. nov.
Year: 2025
Type: other
Abstract: Hyloscirtus elbakyanae sp. nov. Figs 5, 7, 9, 11, 18, 19 Common name: Proposed standard English name: Elbakyan stream frog Proposed standard Spanish name: Rana de Torrente de Elbakyan Type material. Holotype. • QCAZ 53808 (Figs 18, 19), field no. SC 39260, adult male from Ecuador, Provincia Morona Santiago, Comunidad Shaime, near Mirador de la Virgen (2.975540 ° S, 77.80346 ° W), 622 m above sea level, collected by SRR, A. Merino, F. Ayala, T. Camacho, and M. Cohen on 23 July 2012. A 3 D model of the holotype is available at Sketchfab platform (https://skfb.ly/oSXSH). Paratypes. • All collected in Ecuador, Provincia Morona Santiago. Same locality and collection data as the holotype, QCAZ 53807, 53831 adult males. Surroundings of Río Shaime (2.9409 ° S, 77.8012 ° W), 511 m, QCAZ 72665 –66 adult males, collected on 6 June 2018; • Tiwintza-Shaime road (2.9750 ° S, 77.7957 ° W), 211 m, QCAZ 72667, collected on 8 June 2018; • Mirador de la Virgen, Tiwintza-Shaime road (2.9756 ° S, 77.8015 ° W), 529 m, QCAZ 72668 adult male, collected on 8 June 2018; • Peñas-Shaime road (2.9663 ° S, 77.8468 ° W), 363 m, QCAZ 72669, collected on 9 June 2018; • Peñas-Shaime road, 2.8 km E Río Yaupi (2.9663 ° S, 77.8468 ° W), 363 m, QCAZ 73709 adult male. F. Ayala, D. Núñez, K. Nusirquia and A. Carvajal collected all specimens from 2018. Definition. In this section, coloration and characters refer to preserved specimens unless otherwise mentioned. The Definition and Diagnosis are based on eight adult males, females are unknown. Hyloscirtus elbakyanae sp. nov. can be diagnosed by the combination of the following characters: (1) male mean SVL 36.3 mm (range 34.5–37.6; n = 9; Suppl. material 1: table S 5, Fig. 7); (2) white supralabial stripe absent; (3) tympanum round, inconspicuous; supratympanic fold inconspicuous and unpigmented; (4) white ulnar and cloacal folds present; white tarsal fold present, inconspicuous to conspicuous; (5) subarticular tubercles conspicuous in hands and feet; (6) supernumerary tubercles inconspicuous; (7) calcar tubercle absent; (8) pericloacal spots well-defined; (9) all surface plain cream with inconspicuous or absent white spots and minute or thick black spots or flecks in the dorsum; (10) in life, dorsal surfaces and flanks olive green, brownish green or greyish green with or without white flecks and with minute or thick black spots or flecks; axillar and inguinal regions silver or brownish; venter and posterior surfaces of tights yellow; other ventral surfaces silver or brownish; pericloacal spots ill-defined, unpigmented; webbing yellow orange; iris pearl to clam shell with pinkish drown or leather reticulations; (11) the advertisement call consists of a single note, with a mean duration of 0.056 ± 0.001 s and a dominant frequency of 2321.29 ± 127.86 Hz and fundamental frequency of 1184.35 ± 30.48 Hz. The call can be repeated in a series of 4–13 calls. Diagnosis. Characters in this section pertain to preserved specimens unless otherwise noticed. Coloration refers to live specimens. The most similar species to Hyloscirtus elbakyanae sp. nov. in the Amazon basin are Hyloscirtus albopunctulatus, H. maycu sp. nov., H. dispersus sp. nov., H. phyllognathus, and H. torrenticola. Hyloscirtus elbakyanae sp. nov. differs by the absence of a white supralabial stripe (present in H. albopunctulatus, H. phyllognathus and H. torrenticola), an absent supratympanic fold (present in H. albopunctulatus and H. dispersus sp. nov.), an inconspicuous tarsal fold (conspicuous in H. albopunctulatus, H. phyllognathus, and H. torrenticola), conspicuous subarticular tubercles in hands and feet (inconspicuous in hands and feet in H. albopunctulatus, Fig. 11), inconspicuous supernumerary tubercles in hands and feet (conspicuous in hands in H. dispersus sp. nov.), absent pericloacal spots (present in H. albopunctulatus and H. phyllognathus), absent calcar tubercle (present in H. dispersus sp. nov. and H. phyllognathus), and a clam shell or pearl iris (clam shell with black or sand dune reticulations in H. albopunctulatus and a bronze iris in H. torrenticola, Fig. 12). The advertisement call of Hyloscirtus elbakyanae sp. nov. has a rise time of 0.57 ± 0.05 s (longer in H. albopunctulatus with 2.28 ± 0.80 s and in H. torrenticola with 0.16 ± 0.017 s), a dominant frequency of 2321.29 ± 127.86 Hz and a fundamental frequency of 1184.35 ± 30.48 Hz (higher dominant frequency of 2795.41 ± 138.68 Hz and fundamental frequency of 2700.63 ± 195.66 Hz in H. dispersus sp. nov.). Hyloscirtus torrenticola also has a higher dominant frequency of 2743.79 ± 48.22 Hz and a fundamental frequency of 2743.75 ± 48.16 Hz. Hyloscirtus elbakyanae sp. nov. has a call duration of 0.06 ± 0.001 s (longer in H. dispersus sp. nov. with 0.11 ± 0.015 s) and an intercall duration of 0.12 ± 0.007 s (shorter in H. torrenticola with 0.07 ± 0.007 and longer in H. albopunctulatus with 0.30 ± 0.06 s and in H. dispersus sp. nov. of 0.33 ± 0.044 s) (Table 4, Fig. 9; Melin 1941; Duellman and Altig 1978; Rivera-Correa 2016). Moreover, H. elbakyanae sp. nov. inhabits elevations between 214 and 622 m, while H. maycu sp. nov. lives higher between 882 and 1183 m, in colder and dryer environments (Figs 5 and 10). The available evidence indicates that H. elbakyanae sp. nov. is larger than H. maycu sp. nov. (Fig. 7). Description of the holotype. Description of characters based on preserved specimen. Adult male (Figs 18, 19). Measurements (in mm): SVL 36.1; foot length 14.3, head length 10.5, head width 11.7, eye diameter 3.4, tympanum diameter 1.6, tibia length 16.9, femur length 16.7, internarial distance 3.0, inter-orbital distance 5.5. Head wider than long; body slender; snout rounded in dorsal and lateral views; distance from nostril to eye shorter than diameter of eye; canthus rostralis distinct; loreal region concave; internarial region nearly flat; top of the head flat; nostrils not protuberant, round, directed anterolaterally; lips rounded, not flared; interorbital area slightly concave, longer than upper eyelid; tympanum inconspicuous, with upper and posterior margins barely covered by a curved and thin inconspicuous supratympanic fold reaching anterior margin of insertion of arm; tympanic annulus absent; tympanic membrane absent; mental gland present, oval-shaped, very distinct, extending ~ 1 / 2 the length of the head; dentigerous processes of vomers straight, in transverse row posterior to level of choanae, which is round, each process narrowly separated from each other and bearing 4 teeth; tongue slightly cordiform, widely attached to mouth floor; vocal slits and vocal sac present. Forearms slender; axillary membrane absent; fingers bearing dermal fringes and rounded discs; relative lengths of fingers I <II <IV <III; webbing formula I basal II 2 – — 3 – III 2 + — 2 – IV; subarticular tubercles prominent, round, single; supernumerary tubercles inconspicuous; thenar and palmar tubercles absent; small prepollex, not modified as a spine; nuptial pads absent; ulnar tubercles absent; outer ulnar fold present. Hindlimbs moderately robust; toes bearing rounded discs; relative length of toes I <II <III <V
Authors: Varela-Jaramillo, Andrea, Streicher, Jeffrey W., Venegas, Pablo J., Ron, Santiago R.
Language: English
Subfield: Global and Planetary Change
Field: Environmental Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6893213933
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