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Nactus notios ZUG, 2020

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)
Common NamesE: Southern Mountains Slender-toed Gecko 
SynonymNactus notios ZUG 2020: 61 
DistributionPapua New Guinea (Milne Bay mainland: forests of the southern peninsula)

Type locality: oil palm plantation, west of Alotau, 10°23.957′S 150°5.497′E, 38 m asl, Milne Bay Province, Papua New Guinea.  
TypesHolotype. LSUMZ 123547, adult male, collected by Christopher C. Austin on 10 August 2006 (Figure 28).
Paratypes. LSUMZ 123551–553, adult females, LSUMZ 123554–558, adult males, all with the same collecting data as holotype. 
DiagnosisDefinition. A bisexual taxon of geckos (Gekkoninae) with moderate to large adults (♀♀ 55–71 mm, ♂♂ 52–70 mm SVL) with keeled subcaudals distally and smooth subcaudals basally on tail, moderate to large postmental scales (12–24, median 18), occasional postmental-infralabial (PmLab = 0–1, median 0) con- tact, moderate number of dorsal tubercle rows (14–19) and mod- erate number of tubercles (25–33, usually ≥29) in parasagittal row (TubRow), tubercles usually present on dorsal surface of thigh and crus, and precloacal pores (13, 10–15) in males, females lack pores (0). Diagnostic summary in Table 8.

Variation. Females and males display slight met- ric differences (adult ♀♀ 63.9, 55.4–70.9 mm; adult ♂♂ 60.0, 52.1–70.1 mm SVL), although sharing similar proportions (total adult sample): TrunkL/SVL 41.6%, 37%–45%; HeadL/SVL 27.0%, 26%–28%; HeadW/SVL 17.0%, 16%–18%; HeadW/ HeadL 63.2%, 58%–67%; EyeD/SVL 6.2%, 5%–7%; EyeD/ HeadL 23.1%, 20%–26%; NarEye/HeadL 32.1%, 30%–41%; Interorb/HeadL 25.6%, 23%–28%; SnW/HeadL 14.8%, 13%–17%.
Typical head scale pattern of small, granular scales except for those bordering nares and mouth. Snout with large rostral scale bearing middorsal cleft posteriorly; supranasals moderate sized, usually in contact on midline or separated by small granu- lar scale (internasal); large supralabials (4, 3–5) and infralabials (4, 3–5) in front of anterior edge of orbit, first supra- and infral- abial largest of respective series. Chin with large trapezoidal mental and moderate to large postmentals (Postm = 18, 12–24) and genial scale occasionally between postmental and first supra- labial (0, 0–1 PmLab); dorsally, trunk with 17, 14–19 (DorsTub) enlarged tubercles transversely on dorsum and with 30, 25–33 tubercles (TubRow) longitudinally along trunk; 10, 8–10 tuber- cle rows transversely between hindlimbs (TubHip). Enlarged tubercles on crus and femur (TubHindl = 2). Tail with small uniform scales dorsally and laterally and mix of small keeled and smooth scales basally (Subcaud = 2). Usually, pair of cloacal spurs (2, 1–3 CloacS) on each side. Ventral scales from chin to vent small, granular, and unicarinate, somewhat larger on chest and abdomen. Cloacal pores, males 10–15, females 0. Forefoot with narrow digits, their lengths usually 3≈4>2≈5>1; 17, 14–22 lamellae beneath fourth digit (4FingLm), 7, 5–9 scale rows on palm; hindfoot with narrow digits, their lengths 3≈4>2≈5>1; 22, 18–24 lamellae beneath fourth toe (4ToeLm).
Coloration in life not reported. In alcohol, color and pattern match the general description of the holotype. The cream postor- bital stripe may be absent in some individuals. The dorsal trunk pattern of paired dorsal blotches is distinct in all individuals and ranges from 5 to 6 pairs from between shoulders to sacrum. If tail is unregenerated, it is regularly dark banded. 
CommentDistribution: see map in Zug 2020: 53 (Fig. 22). 
EtymologyThe specific name notios is a Greek adjective for “southern, wet, rainy” and refers to the location of this population in the southern peninsula and its mountains of mainland Milne Bay. 
  • Zug, George R. 2020. Diversity in Pacific Slender-Toed Geckos, Nactus pelagicus Complex (Reptilia: Squamata), of New Guinea and Adjacent Islands. Smithsonian Contributions to Zoology, (651): x + 92 pages - get paper here
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