Microhyla sriwijaya

(Figs. 1 – 8; Tables 1 – 7) http: // zoobank. org / urn: lsid: zoobank. org: act: 8 C 57 B 2 A 0 - BAE 4 - 4736 - A 62 E-B 380 F 2 C 72650

Sumber: A tiny new species of Microhyla Tschudi, 1838 (Amphibia: Anura: Microhylidae) from Belitung Island and Southeastern Sumatra, Indonesia

Description of holotype (measurements in mm) (Fig. 4). A small-sized adult male (SVL 13.5), rather slender. Head characters: head wider than long (HW 4.5, HL 3.7); snout obtusely rounded in dorsal and ventral view, rounded in lateral view, its length (SL 1.5) longer than horizontal diameter of eye (ED 1.2); loreal region acute, rounded canthus rostralis; interorbital space flat; interorbital distance wider (IOD 1.8) than upper eyelid width (UEW 0.7) and internarial distance (IND 1.2); nostrils oval, placed more towards lateral side of snout, closer to snout (S – NL 0.5) than eye (N – EL 0.8); tympanum hidden; supratympanic fold extending from posterior corner of eye to the shoulder weakly-developed; vomerine teeth absent; tongue small, oval, without papillae. Forelimb characters: Arms short, forearm length (FAL 2.4) shorter than hand length (HAL 3.5); relative length of fingers I <IV <II <III (FL I 0.3, FL II 0.8, FL III 2.2, FL IV 0.6); tips of all fingers with dorso-terminal grooves, cover bifurcate distally, finger tips slightly wider compared to finger width (FD I 0.4; FW I 0.3, FD II 0.5; FW II 0.4, FD III 0.5; FW III 0.4, FD IV 0.4, FW IV 0.4); dermal fringes weakly-developed, webbing absent between fingers; subarticular tubercles rather prominent; outer and inner palmar tubercles weakly developed; supernumerary tubercles absent; nuptial pad absent. Hindlimb characters: Hind limbs short, thigh (TL 7.6) shorter than shank (SHL 8.2) and nearly equal to foot (FOL 7.5); distance from base of tarsus to tip of toe IV (TFOL 11.1); relative length of toes I <II <III <V <IV; toe tips rounded, slightly enlarged into discs (TD I 0.4; TW I 0.5, TD II 0.6; TW II 0.5, TD III 0.6; TW III 0.5, TD IV 0.7, TW IV 0.5, TD V 0.5, TW V 0.3); toe discs with prominent dorso-terminal grooves, cover bifurcate distally; dermal fringes weakly-developed; foot webbing rudimentary: I 2 –– 2 II 2 –– 3 – III 3 –– 4 – IV 4 –– 3 – V; subarticular tubercles prominent, all present, circular; inner metatarsal tubercle prominent (IMTL 0.4), oval-shaped; outer metatarsal tubercle, small (OMTL 0.2), rounded; supernumerary tubercles absent. Skin. Skin of snout shagreened, upper eyelids shagreened to sparsely granular; supratympanic skin fold extending from postorbital area to shoulder weakly developed; anterior and posterior parts of dorsum shagreened with prominent tubercles (more conspicuous in life and inconspicuous in preservation); and upper and lower parts of flank shagreened; dorsal surfaces of forelimb, thigh, and shank shagreened with granular tubercular projections; posterior parts of thigh and cloacal region sparsely granular. Ventral surfaces of throat, chest, belly, and limbs smooth (Figs. 3, 4). Colour in life. Dorsum dark brown with scattered light and dark brown to orangish minute spots; dorsum with a prominent dark median mark extending posteriorly up to the vent, narrow anteriorly from the level of the shoulder and expanding dorsolaterally towards flanks and groin; margins of the dorsal marking concave with broad reddishbrown or orange colouration on either side; iris golden brown; tip of tubercular projections on the dorsum reddishorange; a narrow brown stripe between the eye; snout and lateral surface of head lighter than dorsal colouration, with scattered contrasting patches and spots; a faint yellowish-grey streak extending from posterior corner of eye to arm insertion; flank dark brownish-black with scattered light brown or white patches and spots spread from postorbital region towards groin (Fig. 3); groin greyish-brown; anterior parts of thigh light brown with faint grey spots; a dark blackish-brown crescent-shaped marking above the cloacal opening; forelimbs and hind limbs (including toes) light greyish-brown with dark brown transverse bands. Ventral surface of throat dark bluish-black; belly light grey with blue tinge and scattered white spots; limbs flesh coloured; ventral surfaces of foot and hand dark greyish-brown. In preservation. Dorsum greyish-brown; brick red margins of the dorsal marking turn light reddish-grey after preservation (40 days); forelimbs and hind limbs grey with greyish-brown transverse bands. Ventral surface of throat blackish with grey mottling; belly light grey; limbs light grey with dark grey mottling on the margins (Fig. 4). Morphological variations (Figs. 3, 5). Morphometric data from five adult males and two adult females is given in Table 3. The overall morphology of the paratypes is similar to the holotype with slight variations in skin texture, colour, and markings. Paratype (MZB Amph 31747, male): Dorsum greyish-brown with brownish-orange patches on either side of dorsum, flanks light grey with scattered blackish-brown blotches; ventral surface with a reddish tinge. Paratype (MZB Amph 31753, male): dorsum brown with a reddish tinge and the dorsolateral concave stripes light brown. Referred specimen (MZB Amph 31748, male): dorsum reddish-brown. Paratype (MZB Amph 31754, female): dorsal skin granulation relatively less compared to the male samples, and dorsum light brown with dark median marking, with lesser reddish tinge compared to the males; flanks blackish-brown with a bluish tinge; ventral surfaces greyish-brown with a bluish tinge and light grey spots. In general, the Belitung specimens were relatively more colourful and boldly patterned dorsally and laterally, flank blotches orange to cream, as compared to Sumatran individuals. Secondary sexual characters. Males with single median vocal sac. Female (MZB Amph 31754): ova pigmented on poles (diameter 0.9 – 1.1 mm, N = 9).