Hylarana erythraea ( Schlegel, 1837 )

Hylarana erythraea ( Schlegel, 1837) View in CoL

Examined materials ( 18 specimens)

MALAYSIA: Langkawi Island: IABHU 21105–21107, females. Vietnam. Ba Ria-Vung Tau Province, Con Son Isl., Con Dao N.P.: ZMMU NAP 0562–0563, males; Binh Chau-Phuok Buu N.P.: ZMMU NAP 3062, female. Localities of the following samples are not available: ZMMU NAP 0598–0599, females; ZMMU NAP 02547, female; ZMMU NAP 0600, male; ZMMU ABV 01151, female; ZMMU NAP 01152–01153, males ZMMU A 5237 1–2, males; ZMMU A 3521 (24), female; ZMMU A 3521 (19), female; ZMMU A 4523, female.

Descriptive characters

Large-sized frogs with a SVL of 51.4–64.9 mm in females and 26.7–35.4 mm in males, showing an important dimorphism in body size. Cream-white dorsolateral folds prominent and running from the posterior corner of the eye to the groin (fig. 7C). Head longer than wide. Eye diameter larger than tympanum diameter. Fingers free of webbing. Tips of fingers dilated into small discs with well-developed ventro-lateral grooves; relative finger length F1 <F4 <F2 <F3 (fig. 7K). Tips of toes dilated into ogival-shaped discs with distinct ventro-lateral grooves; relative toe length T 1 < T 2 < T 3 < T 5 < T 4 (fig. 7O). No more than two phalanges of the fourth toe free of webbing. Subarticular tubercles moderately large and prominent. Inner metatarsal tubercles elongated and outer metatarsal tubercles oval. Both distinct. Tibiotarsal articulation reaching the anterior corner of the eye. Numerous granules present on the posterior region of the femur just above the anus.

Color in alcohol

Dorsum greyish brown in color (fig. 7C). Ventral side of the throat slightly whitish with numerous irregular black spots. Surface of hind limbs brown becoming gradually faint. Poorly distinct blackish bands present on the surface of the hind limbs, but absent on the ventral surface (fig. 7G).

Variation

In the examined specimens, ventral color is variable: in a first frog numerous greyish spots present on the ventral surface of the throat, ranging from the base of the lower lip to the middle of the belly ( IABHU 21107 View Materials ). The black spots are poorly distinct in a second individual ( IABHU 21106 View Materials ) and completely absent in the third ( IABHU 21105 View Materials ). Color variation of remaining 15 specimens is not available.

Remarks

We examined two specimens ( CAS 229614 and 247465) of “ H. tytleri ” ( Oliver et al. 2015) from Tanintharyi Division, Myanmar. These two specimens, currently considered as “ H. erythraea ” ( Mulcahy et al. 2018) , are not adult despite their relatively large body size ( SVL 54.0– 57.5 mm). Their dorsum is light brownish with a few black scattered dots (fig. 7D) and dorsolateral folds are present. The ventral surface is whitish (fig. 7H). Fingers tips are dilated into small discs. The first finger is shorter than the forth, which is shorter than the second (fig. 7L). Tips of toes form small discs with well-developed latero-ventral grooves. The third toe is shorter than the fifth (fig. 7P).

Subarticular tubercles are moderately large and prominent.