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| Kurixalus absconditus
Mediyansyah, Hamidy, Munir & Matsui, 2019
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ABSTRACT
Kurixalus absconditus sp. nov., a new species of tree frog of the genus Kurixalus, described from West Kalimantan on the basis of molecular phylogenetic and morphological evidence. The new species can be distinguished from its congeners by a combination of following morphological characters: havingsmaller body size, more prominent of mandibular symphysis, skin smooth on throat, vomerine odontophores two oblique series touching anterior corner of choanae and widely separated, vomerine teeth thick, buccal cavity narrow and deep, choanae with teardrop shaped, single vocal slit, weakly crenulated dermal fringe on fore-and hindlimbs.
Keywords: Kurixalus absconditus sp. nov., new species, West Kalimantan
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| Figure 4. (A & B) Adult male holotype of Kurixalus absconditus sp. nov. (MZB Amph 21862) in life; (C & D) juvenile paratype MZB Amph 21860–21861. Not to scale.
(Photographs by Mediyansyah).
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Kurixalus absconditus sp. nov.
Etymology. The specific epithet “absconditus” is derived from a Latin word, ”disguised, concealed or hidden”. The name is an adjective in concordance with the previous undetected status of this species within K. appendiculatus group.
Suggested English common name. Piasak-frilled Swamp Treefrogs.
Suggested Indonesia common name. Katak-renda piasak.
Diagnosis. The new species is assigned to the genus Kurixalus based on molecular analysis, and following morphological characters: asmall-sized rhacophorid(SVL<50 mm);tips of fingers dilated into round disks having circummarginal grooves; snout tip pointed; finger webbing poorlydeveloped; toe webbing moderately developed; dermalfringespresentonforearmand tarsus; narrow flap on heel and crenulate dermal projection on vent; dorsum brown with saddle-shaped or X-shaped marking (Nguyen et al., 2014a; Yu et al., 2017b, 2018). Kurixalus absconditus sp. nov. can bedistinguished from all known congeners by a combination of following morphological characters: (1)smaller body size of an adult male; (2) more prominent mandibular symphysis; (3) skin smooth on throat; (4) vomerine odontophores two oblique series touching anterior corner of choanae and widely separated; (5) vomerine teeth thick, short with oval-shaped; (6) narrow and deep buccal cavity; (7) choanae teardropshaped; (8) weakly crenulated dermal fringe on outer edges of fore-and hindlimb; (9) hindlimb slightly short, tibio-tarsal articulation of adpressed limb reaches center of the eye.
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Figure 8. (A) Non–vouchered adult male of Kurixalus absconditus sp. nov.;
(B) adult male of K. chaseni from Bukit Batikap, Central Kalimantan Province; (C) adult male of K. chaseni from Lahat, South Sumatra Province; (D) adult male of K. chaseni from Ketapang, West Kalimantan Province; (E) adult male of K. chaseni from Sungai Wain, East Kalimantan Province; (F) adult male of K . chaseni from Grand Forest Park (TAHURA) Sultan Adam, South Kalimantan Province; (G) adult male of K. chaseni from Terengganu, Peninsular Malaysia;
(H) adult male of K. appendiculatus from the Philippines.
Not to scale. Photographs by Mediyansyah (A, B, C, D); Amir Hamidy (E); Zainudin. B. Akar (F); Evan Quah (G); Arvin C. Diesmos (H).
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| Map of the Kalimantan, Indonesian Borneo showed the type locality of Kurixalus absconditus sp. nov. (red circle) |
Distribution and Natural history. Kurixalus absconditus sp. nov. currently is known only from the type locality. The holotype and juvenile paratypes were collected in the shrub swamp habitat close to secondary swamp forest (Fig. 9). The holotype was found clinging to the trunk of a tree 70 cm above the ground and the juvenile paratypes were found perched on leave 100–190 cm above the ground. The tadpoles, eggs, and female individual were not found. The advertisement call of this species is unknown. Associated frog species observed in the collection site were Amnirana nicobariensis (Stoliczka), Chalcorana raniceps (Peters), Hylarana erythraea (Schlegel), Polypedates colletti (Boulenger), Pulchrana baramica (Boettger), and Limnonectes paramacrodon (Inger).
Mediyansyah, Amir Hamidy, Misbahul Munir and Masafumi Matsui. 2019. A New Tree Frog of the Genus Kurixalus Ye, Fei & Dubois, 1999 (Amphibia: Rhacophoridae) from West Kalimantan, Indonesia. Treubia. 46; 51–72. DOI: 10.14203/treubia.v46i0.3790
