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Cyrtodactylus sermowaiensis (DE ROOIJ, 1915)

IUCN Red List - Cyrtodactylus sermowaiensis - Least Concern, LC

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)
Subspecies 
Common NamesE: De Rooji’s bent–toed gecko, DeRooij's Bow-fingered Gecko
G: De Rooijs Bogenfingergecko 
SynonymGymnodactylus sermowaiensis DE ROOIJ 1915: 9
Gymnodactylus (Cyrtodactylus) sermowaiensis — WERMUTH 1965: 67
Cyrtodactylus sermowaiensis — BROWN & PARKER 1973
Gonydactylus sermowaiensis — KLUGE 1991
Cyrtodactylus (Cyrtodactylus) sermowaiensis — RÖSLER 2000: 67
Cyrtodactylus sermowaiensis — OLIVER et al. 2011
Cyrtodactylus sermowaiensis — OLIVER et al. 2020 
DistributionPapua New Guinea (Sermowai River)

Type locality: Sermowai River, New Guinea.  
Reproductionoviparous 
TypesHolotype: ZMA.RENA 10910 
DiagnosisDiagnosis. A species of Cyrtodactylus that can be distinguished from all other species of Melanesian Cyrtodactylus by the following unique combination of character states: moderate size (adult SVL 78–112 mm); continuous medial row of transversely enlarged subcaudal scales absent; enlarged femoral scales absent; precloacal or femoral pores in males absent; dorsal colouration on body of 5–6 irregular dark-brown dorsal bands or series of blotches (not including nuchal band) alternating with weaker brown interstitial bands; dorsal and lateral tubercles present on proximal and distal segments of all limbs; dorsal tubercles at mid-point of body between lateral skin folds in 16–19 rows; tubercles across supraand interorbital regions usually <10; majority (>90%) of tubercles within dark-brown dorsal bands also dark brown and not contrasting against surrounding pigmentation; pale yellow lateral spots absent or at most sparse on head and torso; pale regions on dorsal surfaces of neck and posterior head lacking aggregations of subcircular markings; and nuchal band with few or no subcircular indentations along its margins (Oliver et al. 2020: 344).

Comparisons with other species. Cyrtodactylus sermowaiensis can be readily distinguished from all other recognised Melanesian Cyrtodactylus by the absence of enlarged femoral scales in both sexes and the absence of precloacal or femoral pores in males. The geographic range of Cyrtodactylus sermowaiensis only overlaps with a small number of Cyrtodactylus. In addition to the characters above, C. sermowaiensis can be further distinguished from these overlapping Cyrtodactylus species as follows: from C. equestris and C. rex by its smaller size (max SVL 112 mm versus 139 mm and 172 mm respectively), absence of enlarged tubercles on the throat (versus present) and dorsal pattern consisting of 5–6 dark-brown transverse bands or blotches (versus 2–3 dark to medium-brown bands or blotches); from C. mimikanus by lacking transversely widened subcaudals (versus present) and dorsal pattern consisting of dark-brown transverse markings with no light border and similarly coloured interstitial bands (versus thin dark-brown transverse bands with a light border and no interstitial bands); and from C. boreoclivus by lacking transversely widened subcaudals (versus present) and in having a light-brown dorsal ground colouration (versus mid-brown) (Oliver et al. 2020: 344). 
Comment 
EtymologyNamed after the type locality. 
References
  • Brown, Walter C. & Parker, Fred 1973. A new species of Cyrtodactylus (Gekkonidae) from New Guinea with a key to species from the island. Breviora (417): 1-7 - get paper here
  • de Rooij, N. de 1915. The Reptiles of the Indo-Australian Archipelago. I. Lacertilia, Chelonia, Emydosauria. Leiden (E. J. Brill), xiv + 384 pp.
  • Günther, R. & H. Rösler 2002. Eine neue Art der Gattung Cyrtodactylus GRAY, 1827 aus dem Westen von Neuguinea (Reptilia: Sauria: Gekkonidae). Salamandra 38 (4): 195-212 - get paper here
  • Kraus, Fred 2008. Taxonomic partitioning of Cyrtodactylus louisiadensis (Lacertilia: Gekkonidae) from Papua New Guinea. Zootaxa 1883: 1–27 - get paper here
  • KRAUS, FRED; VALTER WEIJOLA 2019. New species of Cyrtodactylus (Squamata: Gekkonidae) from Karkar Island, Papua New Guinea. Zootaxa 4695 (6): 529–540 - get paper here
  • OLIVER , PAUL; PAUL EDGAR, MUMPUNI, DJOKO T. ISKANDAR & RON LILLEY 2009. A new species of bent-toed gecko (Cyrtodactylus: Gekkonidae) from Seram Island, Indonesia. Zootaxa 2115: 47-55 - get paper here
  • RIYANTO, AWAL; AARON M. BAUER & DONAN SATRIA YUDHA 2014. A new small karst-dwelling species of Cyrtodactylus (Reptilia: Squamata: Gekkonidae) from Java, Indonesia. Zootaxa 3785 (4): 589–599 - get paper here
  • Rösler, H. 2000. Die postanale Beschuppung bei Cyrtodactylus GRAY 1827 und Cyrtopodion FITZINGER 1843 - funktionelle und taxonomische Aspekte (Sauria: Gekkonidae). Gekkota 2: 154-207
  • Rösler, H. & Glaw, F. 2008. A new species of Cyrtodactylus Gray, 1827 (Squamata: Gekkonidae) from Malaysia including a literature survey of mensural and meristic data in the genus. Zootaxa 1729: 8–22 - get paper here
  • Rösler, H. & S. J. Richards & R. Günther 2007. Bemerkungen zur Morphologie und Taxonomie der östlich der Wallacea vorkommenden Geckos der Gattung Cyrtodactylus GRAY, 1827, mit Beschreibungen von zwei neuen Arten (Reptilia: Sauria: Gekkonidae). Salamandra 43 (4): 193-230 - get paper here
  • Rösler, H., Glaw, F.& R. Günther 2005. Aktualisierte Liste der Geckos von Neuguinea (Sauria: Geckonidae: Gekkoninae) mit vorläufiger Charakterisierung von neun Formen aus den Gattungen Cyrtodactylus Gray, 1827, Gehyra Gray, 1834 und Nactus Kluge, 1983. Gekkota 5: 33-64 - get paper here
  • Tri, Ngo Van 2008. Two new cave-dwelling species of Cyrtodactylus Gray (Squamata: Gekkonidae) from Southwestern Vietnam. Zootaxa 1909: 37–51 - get paper here
 
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