Sunday, December 20, 2015

[Herpetology • 2015] Clinotarsus penelope | กบเขาสูง • When Young are More Conspicuous than Adults: A New Ranid Species (Anura: Ranidae) from Thailand revealed by its Tadpole

กบเขาสูง | Hill Frog | Clinotarsus penelope
Grosjean, Bordoloi, Chuaynkern, Chakravarty & Ohler, 2015
DOI: 10.11646/zootaxa.4058.4.2
photo: C. Deekrachang |


Tadpoles of Clinotarsus alticola collected nearby the type locality in Assam, India are barcoded and described. A detailed morphological and morphometrical description of the specimens, along with a study of the anatomy of the buccal cavity are provided. A comparison of these tadpoles with “Clinotarsus alticola” tadpoles from peninsular Thailand and of the genetic variation of a fragment of their mtDNA 16S gene led us to assign the population of peninsular Thailand to a new species, Clinotarsus penelope sp. n. The holotype of the new species is chosen among the tadpole series as no adult could be found in the type locality. Presumed conspecific adults of nearby localities are morphologically described and compared to barcoded adults of Clinotarsus alticola, waiting for further molecular confirmation. The tadpole of the new species differs from that of C. alticola by a much greater size at comparative stages (e.g., 77.7 mm vs. 53.3 mm in stage 36, respectively), a black coloration (vs. a yellow-olive tinge), several ocelli on the tail muscle (vs. only one), a rounded snout (vs. a more pointed snout) and a different Keratodont Row Formula (KRF; nine keratodonts rows maximum on both labia in C. penelope vs. eight maximum in C. alticola). A discussion about the choice of the holotype, the assignment of adult specimens and the future confirmation of this assignment are provided, as well as a comparison with older descriptions of “Clinotarsus alticola” sensu lato tadpoles and with Clinotarsus curtipes tadpoles from Karnataka, India. The lectotype of Clinotarsus alticola is redescribed.

Keywords: Clinotarsus alticola, Ranidae, tadpole, holotype, India, Thailand, Amphibia

Distribution limited to the tadpole data (Fig. 10). Thailand: Namtok Raman Forest Park, Phang Nga Province (type locality). Localities of referred specimens: Kaeng Krachon National Park, Phetchaburi Province; Khao Sok National Park, Surat Thani Province; Khlong Palian at junction of streams arising from Nam Tok Ton Tok and Nam Tok Ton Te,Trang Province, Khlong Rang Waterfall, Ngao National  Park,  Pha  To,  Chumphon  Province. Smith (1930) mentioned the  presence  of  “Rana  alticola”  in  the  province of Nakhon Si Thammarat which fills a gap between the provinces of Surat Thani and of Trang.

Etymology. This species is dedicated to the daughter of the first author, Pénélope. The nomen is used as a noun in apposition to generic substantive.

Grosjean, Stéphane, Sabitry Bordoloi, Yodchaiy Chuaynkern, Paramita Chakravarty and Annemarie Ohler. 2015. When Young are More Conspicuous than Adults: A New Ranid Species (Anura: Ranidae) revealed by its Tadpole. Zootaxa. 4058(4): 471–498. DOI: 10.11646/zootaxa.4058.4.2