Friday, April 20, 2018

[Herpetology • 2018] Leptolalax macrops • A New Species of the Genus Leptolalax (Anura: Megophryidae) from southern Vietnam

Leptolalax macrops 
Duong, Do, Ngo, Nguyen & Poyarkov, 2018


 We describe a new species of megophryid frog from Phu Yen Province in southern Vietnam. Leptolalax macrops sp. nov. is distinguished from its congeners by a combination of the following morphological attributes: (1) body size medium (SVL 28.0–29.3 mm in three adult males, 30.3 mm in single adult female); (2) supra-axillary glands present, creamy white; ventrolateral glands indistinct; (3) tympanum externally distinct; (4) dorsal skin roughly granular with larger tubercles, dermal ridges on dorsum absent; (5) rudimentary webbing present between fingers I–II and II–III; rudimentary webbing between all toes; fingers and toes without dermal fringes; (6) in life ventral surface greyish-violet with white speckling; (7) supratympanic fold distinct, dark brown in life; (8) iris bicolored, typically golden in upper half, fading to golden green in lower half; (9) tibia short (TbL/SVL 0.44–0.45 in males); and (10) eyes large and protuberant (ED/SVL 0.15–0.16 in males). From all congeners for which comparable sequences are available, the new species differs markedly in the 16S rRNA mitochondrial gene sequence (P-distance>5.7%). The new species is currently known only from montane evergreen tropical forests of Song Hinh District, Phu Yen Province, and M’Drak District of Dak Lak Province at elevations of 470–630 m a.s.l. We suggest the new species should be considered as Data Deficient following the IUCN’s Red List categories. We also report a previously unknown Leptolalax mtDNA lineage from an evergreen tropical forest in the Hoa Thinh District of Phu Yen Province, which may also represent an undescribed species.

Keywords: Leptolalax macrops sp. nov.; Phu Yen Province; Dak Lak Province; Southern coastal region of Vietnam

Figure 5: Male paratype of Leptolalax macrops sp. nov. (IEBR A.2017.9) in life (Photo taken in situ. Photo by Dang Trong Do)

Leptolalax macrops sp. nov.
 Chresonymy: Leptolalax sp. [molecular lineage 7] — Rowley et al., 2015a: 10, 12.

Etymology: Specific epithet “macrops” is a noun in the nominative case, derived from Greek “macros” for “large” and “ops” for “eye”, in reference to its comparatively large eye size. 

Recommended vernacular names: We recommend “Big-eyed Litter Frog” as the common English name of the new species and the common name in Vietnamese as “Cóc mày mắt to”

Figure 5: Male paratype of Leptolalax macrops sp. nov. (IEBR A.2017.9) in life.
Figure 6: Typical habitat (A) and microhabitat (B) of Leptolalax macrops sp. nov. in type locality: Suoi Khi Stream, Hon Den Mt., Ea Ly and Ea Trol commune border, Song Hinh District, Phu Yen Province, Vietnam
 (Photos by Dang Trong Do)

Tang Van Duong, Dang Trong Do, Chung Dac Ngo, Truong Quang Nguyen and Nikolay A. Poyarkov, Jr. 2018. A New Species of the Genus Leptolalax (Anura: Megophryidae) from southern Vietnam. ZOOLOGICAL RESEARCH. 38(3); 1-16. DOI: 10.24272/j.issn.2095-8137.2018.009

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