Microhyla sundaica Trofimets, Dufresnes, Pawangkhanant, Bragin, Gorin, Hasan, Lalremsanga, Muin, Le, Nguyen, Suwannapoom & Poyarkov, 2024, sp. nov.
Year: 2024
Type: other
Abstract: Microhyla sundaica sp. nov. Figures 6 E – F, 7 C, 10 C, 14, 15 C – D; Tables 2, 3, 6 Suggested common name. Sundaic narrow-mouthed frog. Chresonymy. Microhyla berdmorei — Inger (1966: 149–151, in part); Grandison (1972: 59, in part); Dring (1979: 194, in part); Malkmus et al. (2002: 130–131, in part); Grismer et al. (2004: 18, in part); Das and Yaakob (2007: 68, in part); Grismer and Aun (2008: 277, in part); Chan et al. (2010: 203, in part); Teynié et al. (2010: 8); Matsui (2011: 35, 39); Matsui et al. (2011: 168, 171, 174, in part); Pradana et al. (2017: 70–90, in part); Firdaus et al. (2018: 1–6, in part); Haas et al. (2018: 89–114); Chan et al. (2019: 1057, in part); Nguyen et al. (2019: 549–580, in part); Gorin et al. (2020: 1–47, in part); Gorin et al. (2021: 97, in part); Poyarkov et al. (2021: 40, in part); Haas et al. (2022: 304–305); Badli-Sham et a l. (2023: 49, 82, in part); Frost (2024: page “ Microhyla berdmorei ” in part). Holotype. ZMMU A-8011, adult female from environs of Sungai Tua Recreational Forest, Selangor State, Malaysia (approximate coordinates: 3.32 ° N, 101.70 ° E), collected on January 27, 2003, by A. T. Aful. Paratypes (n = 5). Two adult males: ZMMU A-8012 and ZMMU A-8014 and two adult females: ZMMU A-8010, ZMMU A-8013, all collection data are the same as for the holotype. One adult male: ZMMU A-6158 from Kuala Tahan District, Pahang State, Malaysia (approximate coordinates: 3.96 ° N, 102.44 ° E) collected on January 18, 2003, by A. T. Aful. Diagnosis. Microhyla sundaica sp. nov. is characterized by a combination of the following morphological features: (1) medium body size (27.5-27.9 mm in males, 28.3-31.4 mm in females), with moderately stocky and triangular body habitus; (2) head wider than long; (3) dorsal skin shagreened with numerous small tubercles; (4) snout pointed in dorsal and ventral views, bluntly rounded in lateral view; (5) first finger notably longer than half the length of second finger; (6) finger tips with well-developed disks bearing wide and deep dorsomedial grooves; (7) toes dilated in wide disks, each with complete and deep dorsomedial groove, separating the toe disk into a pair of scale-like pads; (8) tibiotarsal articulation of the adpressed limb extending far beyond the snout tip; (9) toe webbing reaching to the disks on all toes; webbing formula: i 1-1 ii 1 - 2 iii 1 - 1 iv 1 - 1 v; (10) throat and chin dark-gray in males, beige in females; belly bright yellow in life; (11) dorsal surfaces of forelimbs without prominent crossbars, hindlimbs with 2–3 dark-brown crossbars on thighs and shanks; (12) two black blotches above cloacal opening edged with beige; (13) gray-brown dorsal “ teddy-bear ” - pattern distinct, edged with beige or white, anteriorly connecting with the dark interorbital bar; (13) dark spots and blotches on body flanks absent or scarce; (15) grayish lateral band with irregular edges extending from armpit to groin; (16) light postocular stripe absent; (17) reddish spots on dorsum and dorsal surfaces of hindlimbs absent; (18) iris uniform grayish-bronze, no black stripe below the pupil. Description of the holotype (Fig. 14). An adult female specimen in a very good state of preservation. Body size medium (SVL 31.4 mm; other measurements are presented in Table 2). Body habitus stocky, triangular, and significantly dorsoventrally flattened (Fig. 14 E). Head triangular in dorsal view; wider than long (HW / HL ratio 1.16). Snout comparatively short and protruding (SL / HL ratio 0.45), appearing pointed in dorsal and ventral views (Fig. 14 E), smoothly rounded in profile, and slightly extending beyond the edge of the lower jaw (Fig. 14 E). Eyes comparatively small, slightly protruding in lateral view, not protruding in dorsal view, significantly shorter than the snout (EL / SL ratio 0.76), and slightly shorter than the interorbital distance (IOD / EL ratio 1.03). Canthus rostralis distinct, rounded; loreal area slightly concave. Nostrils oval-shaped, with dorso-lateral orientation, situated almost on the canthus rostralis, closer to tip of snout than to eye. Interorbital distance broader than the internarial distance (IND / IOD ratio 0.77). Upper eyelid length narrower than the interorbital distance (UEW / IOD ratio 0.66). Tympanum concealed, supratympanic fold absent (Fig. 14 E). Tongue slender, rounded, free for the posterior four-fifths of its length; vomerine teeth absent. Eggs seen through the incision on the left lateral side of belly small, rounded, ca. 1.0– 1.1 mm in diameter, pigmented. Forelimbs short and slender (Fig. 14 A); lower arm elongated and thin (LAL / FLL ratio 0.83), hand less than half of forelimb length (HAL / FLL ratio 0.47). Fingers slender and elongated, webbing or skin fringes on fingers absent. First finger well-developed, notably longer than half of the second finger length (Fig. 14 D); the relative finger lengths as follows: I <II <IV <III. Fingertips rounded, expanded into well-developed disks narrower than the basal phalanges of the respective fingers. Finger tips with peripheral grooves, dorsally with a wide and deep dorsomedial notch (Fig. 6 F). Finger tips almost equal in width, with the first fingertip slightly narrower. Subarticular tubercles on fingers distinct, large, rounded, and protruding; edges of the distal subarticular tubercle on the fourth finger less distinct. Subarticular tubercle formula: 1, 1, 2, 2 (Fig. 14 D). Two metacarpal tubercles: inner metacarpal tubercle distinct, protruding, rounded in shape; outer metacarpal tubercle rounded, flattened, its diameter much less than the diameter of inner metacarpal tubercle (OPTL / IPTL ratio 1.40). Hindlimbs long, slender, almost four times longer than the forelimbs (HLL / FLL ratio 3.96). Thighs robust and muscular (Fig. 14 B), shanks notably elongated and slender, comprising approximately one-third the length of the hindlimb (TL / HLL ratio 0.35). When the limbs are held the right angle to the body, the heels significantly overlap. Tibiotarsal articulation of the adpressed limb extends well beyond the tip of the snout. The foot length is more than one-third of the hindlimb length and significantly shorter than shanks (FL / HLL ratio 0.29; TL / FL ratio 1.21). The relative toe lengths as follows: I <II <V ≤ III
Authors: Trofimets, Alexei V., Dufresnes, Christophe, Pawangkhanant, Parinya, Bragin, Andrey M., Gorin, Vladislav A., Hasan, Mahmudul, Lalremsanga, Hmar Tlawmte, Muin, Mohd Abdul, Le, Dac Xuan, Nguyen, Tan Van, Suwannapoom, Chatmongkon, Poyarkov, Nikolay A.
Institutions: Lomonosov Moscow State University, Centre National de la Recherche Scientifique, École Pratique des Hautes Études, Nanjing Forestry University, Sorbonne Université, Institut de Systématique, Évolution, Biodiversité, Muséum national d'Histoire naturelle, University of Phayao, Joint Vietnam-Russia Tropical Science and Technology Research Center, Jamalpur Science and Technology University, Mizoram University, Universiti Sains Malaysia, Duy Tan University
Language: English
Subfield: Global and Planetary Change
Field: Environmental Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6892969363
Cites:
Cited by:
Related to: