Nactus erugatus ZUG, 2020
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|Higher Taxa||Gekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)|
|Common Names||E: Milne Bay Smooth-tailed Slender-toed Gecko|
|Synonym||Nactus erugatus ZUG 2020: 62|
|Distribution||Papua New Guinea (Milne Bay Province: SE Owen Stanley Range)|
Type locality: Duabo, Pini Range, 10°06′S 151°15′E, 300 m, Milne Bay Province, Papua New Guinea.
|Types||Holotype. BPBM 15448, adult male, collected by Fred Kraus on 1 May 2002 (Figure 29).|
Paratypes. Adult females, BPBM 15449, with same collecting data as holotype, and BPBM 15451–452 from Owen Stanley Range, Mount Pekopekowana, Garden Camp, 10°17.104′S, 150°10.930′E, 330 m, Milne Bay Province, Papua New Guinea, collected by Fred Kraus and I. Bigilale on 7 May 2002; adult males, BPBM 15443 from Bwaona River, Alotau, 10°30′14′′S, 150°18′50′′E, 90 m, Milne Bay Province, Papua New Guinea, collected by Fred Kraus on 7 April 2002, and BPBM 15450 from Mount Pekopekowana, Garden Camp, 10°17.104′S, 150°10.930′E, 330 m, Milne Bay Province, Papua New Guinea, collected by Fred Kraus and I. Bigilale on 7 May 2002.
|Diagnosis||Definition. A bisexual taxon of geckos (Gekkoni- nae) with large adults (♀♀ 66–72 mm, ♂♂ 59–69 mm SVL) with smooth subcaudals, moderate-sized postmental scales (10–20, median 14), no or slight postmental-infralabial (PmLab = 0–1, median 0) contact, moderate number of dorsal tubercle rows (15–18) and moderate number of tubercles (28–34, usually ≥29) in parasagittal row (TubRow), tubercles usually present on dorsal surface of thigh and crus, and precloacal pores 12–14 in males and 6–12 in females. Diagnostic summary in Table 8.|
Variation. Females and males display slight metric differences (adult ♀♀ 69.7, 66.2–72.2 mm; adult ♂♂ 63.1, 59.0– 69.2 mm SVL), although sharing similar proportions (total adult sample): TrunkL/SVL 41.6%, 38%–45%; HeadL/SVL 27.5%, 26%–28%; HeadW/SVL 17.6%, 16%–18%; HeadW/HeadL 63.9%, 62%–66%; EyeD/SVL 6.9%, 6%–7%; EyeD/HeadL 25.0%, 23%–25%; NarEye/HeadL 32.3%, 31%–33%; Inter- orb/HeadL 25.6%, 23%–27%; SnW/HeadL 14.5%, 14%–15%.
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, 3–4) and infralabi- als (3, 3–4) in front of anterior edge of orbit, first supra- and infralabial largest of respective series. Chin with large trapezoi- dal mental and small to moderate postmentals (Postm = 14, 10–20) and usually no genial scale between postmental and first supralabial (0, 0–1 PmLab); dorsally, trunk with 17, 15–18 (DorsTub) enlarged tubercles transversely on dorsum and with 30, 28–34 tubercles (TubRow) longitudinally along trunk; 10, 8–10 tubercle rows transversely between hindlimbs (TubHip). Enlarged tubercles on crus and femur (TubHindl = 2). Tail with small uniform scales dorsally and laterally, ventrally typically with uniform, small smooth scales (Subcaud = 0). Usually, pair of cloacal spurs (2, 1–2 CloacS) on each side. Ventral scales from chin to vent small, granular, somewhat larger on chest and abdo- men. Precloacal pores, males 12–14, females 6–12. Forefoot with narrow digits, their lengths usually 3≈4>2≈5>1; 18, 17–19 lamel- lae beneath fourth digit (4FingLm), 5, 4–7 scale rows on palm; hindfoot with narrow digits, their lengths 3≈4>2≈5>1; 22, 19–23 lamellae beneath fourth toe (4ToeLm).
Coloration in life not reported. In alcohol, color and pattern match the general description of the holotype.
|Comment||Distribution: see map in Zug 2020: 53 (Fig. 22).|
|Etymology||The specific name erugatus derives from the Latin erugo, “to take wrinkles from or smooth,” and refers to the smooth or keel-free subcaudals of this taxon.|
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