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Cyrtodactylus tahuna RIYANTO, ARIDA & KOCH, 2018

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)
Common NamesE: Tahuna bent-toed gecko
Indonesian: Cicak Jari-lengkung Tahuna 
SynonymCyrtodactylus tahuna RIYANTO, ARIDA & KOCH 2018 
DistributionIndonesia (Sulawesi)

Type locality: Kecamatan (district) Tahuna, Kabupaten (regency) Kepulauan Sangihe, Sangihe Island, Sulawesi Utara, Indonesia (3°36’47” N; 125°30’11” E; 30 m)  
TypesHolotype: MZB Lace.5123 (field number AK028), an adult male (Fig. 2A, 3A in Riyanto et al. 2018), collected on 8 July 2005 by E. Arida and A. Koch. Paratypes (Fig. 2B–C, 3). MZB.Lace.5097 (field number AK032), an adult female, same data as for holotype except for collection date, i.e., 10 July 2005. MZB.Lace.5133 (field number AK029), an unsexed juvenile, same data as for holotype. 
DiagnosisDiagnosis. Cyrtodactylus tahuna sp. nov. can be readily distinguished from the congeners on Sulawesi, the Moluccas, and the Lesser Sunda Islands by the following unique combination of characters: (1) medium size, with a SVL reaching 79.2 mm, (2) brachium and antebrachium tuberculated, (3) raised conical tubercles along ventrolateral body folds, (4) 49–50 ventral scales, (5) precloacal depression in shape of a pit, (6) 14 precloacal pores arranged in the shape of a ‘˄’, (7) enlarged precloacal and femoral scales separated by smaller scales, (8) enlarged femoral scales in two rows, (9) precloacal and femoral pores separated by poreless scales, (10) five femoral pores on both sides, (11) 20–24 lamellae under fourth toes, (12) no transversely enlarged median subcaudals, (13) tail not prehensile, and (14) tubercles extend along about 60% of tail length.

Variation. The paratypes resemble the holotype in coloration and there seems to be no sexual dimorphism in coloration. Both paratypes with nine, wide dark brown bands (including tail tip) separated by narrower light greyish to off-white bands. Male have pores and a precloacal depression, whereas female do not. Paratype MZB.Lace.5133 is an unsexed juvenile, in which pores and a precloacal depression are absent. Detailed variation of mensural and meristic characters are presented in Table 1 (Riyanto et al. 2018).

Comparisons. The new species can be readily distinguished from all recognized congeners occurring on Sulawesi, the Moluccas, and the Lesser Sunda Islands (detailed diagnostic characters in Table 2) except Cyrtodactylus fumosus, C. halmahericus (Mertens, 1929), C. papuensis Brongersma, 1934 and C. tambora Riyanto, Mulayadi, McGuire, Kusrini, Febylasmia, Basyir & Kaiser, 2017, by the following combination of characters: the presence of precloacal pores, femoral pores, enlarged precloacal and femoral scales that are disconnected, and the lack of enlarged median subcaudal scales in original tails. In the following comparisons, the characters for C. tahuna are provided in parentheses. Cyrtodactylus fumosus (data from Mecke et al. 2016a, b) can be easily distinguished from C. tahuna by the absence of tubercles on ventrolateral folds (versus tubercles on ventrolateral skin fold present), the presence of 4–7 unkeeled DorsT (versus 19 keeled DorsT), the presence of EPFS in both sexes (versus EFS and EPS), and the presence of a precloacal groove in males (versus males with a pit-like precloacal depression). Cyrtodactylus halmahericus (data obtained from specimens listed in appendix) can be distinguished from C. tahuna by the presence of EPFS in both sexes (versus EFS and EPS in both sexes), the presence of a continuous row of PFP in males (versus PP and FP in males), and the presence of a precloacal groove in males (versus males with a pit-like precloacal depression). Cyrtodactylus papuensis (data from Rösler et al. 2007) differs from C. tahuna by possessing a deep groove-like precloacal depression (versus pit-like). Cyrtodactylus tambora (data from Riyanto et al. 2017) can be distinguished from C. tahuna by smaller body size with an adult SVL of 39.4–47.4 mm (versus 78.5–79.2 mm), the presence of EPFS in both sexes (versus EFS and EPS in both sexes), the absence of tubercles on the dorsal surface of brachium (versus tubercles on brachium present), and the absence of FP in both sexes (versus FP present in males).
Cyrtodactylus tahuna sp. nov. differs from the following species from central Indonesia by possessing tubercles on the dorsal surface of brachium, with tubercles being absent in C. celatus Kathriner, Bauer, O’Shea, Sanchez & Kaiser, 2014, C. fumosus, C. gordongekkoi (Das, 1994), C. hitchi Riyanto, Kurniati & Engilis, 2016, C. laevigatus Darevsky, 1964, C. tambora, and C. wetariensis (Dunn, 1927). In having tubercles on ventrolateral body folds, the new species differs from Cyrtodactylus celatus, C. fumosus, C. laevigatus, and C. tambora. By having enlarged posterior precloacal scales, Cyrtodactylus tahuna sp. nov. can be distinguished from Cyrtodactylus batik Iskandar, Rachmansah & Umilaela, 2011, C. hitchi, C. nuaulu Oliver, Edgar, Mumpuni, Iskandar & Lilley, 2009, C. spinosus Linkem, McGuire, Hayden, Setiadi, Bickford & Brown, 2008, and C. wallacei Hayden, Brown, Gillespie, Setiadi, Linkem, Iskandar, Umilaela, Bickford, Riyanto, Mumpuni & McGuire, 2008.
In addition, the new species possesses EFS, which distinguishes it from Cyrtodactylus batik, C. celatus, C. hitchi, C. jellesmae (Boulenger, 1897), C. laevigatus, C. spinosus and C. wallacei.
Finally, C. tahuna sp. nov. lacks enlarged transversely subcaudal scales in original tails as opposed to the presence of transversely enlarged, median subcaudal scales as seen in C. batik, C. darmandvillei (Weber, 1890), C. deveti (Brongersma, 1948), C. hitchi, and C. wallacei. 
EtymologyThe species epithet tahuna is a noun used in apposition. Tahuna is the capital town of Kabupaten Sangihe, where the specimens were collected. 
  • Kwet, A. 2019. Liste der im Jahr 2018 neu beschriebenen Reptilien. Elaphe 2019 (3): 52-72
  • RIYANTO, AWAL; EVY ARIDA & ANDRÉ KOCH 2018. Cyrtodactylus tahuna sp. nov., a new bent-toed gecko (Reptilia: Squamata: Gekkonidae) from Sangihe Island, North Sulawesi, Indonesia. Zootaxa 4399 (2): 220–232 - get paper here
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