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Perochirus scutellatus (FISCHER, 1882)

IUCN Red List - Perochirus scutellatus - Least Concern, LC

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Higher TaxaGekkonidae, Gekkota, Sauria, Squamata (lizards: geckos)
Subspecies 
Common NamesE: Shielded Tropical Gecko 
SynonymHemidactylus ateles var. scutellatus FISCHER 1882: 299
Perochirus scutellatus — BOULENGER 1885: 156
Perochirus scutellatus — WERMUTH 1965: 125
Perochirus scutellatus — BROWN 1976
Perochirus scutellatus — KLUGE 1993
Perochirus scutellatus — RÖSLER 2000: 101 
DistributionMicronesia: Tetau Island (Carolines) and Greenwich Islands (Kapingamarangi Atoll, State of Pohnpei).

Type locality: Greenwich Islands.  
Reproductionoviparous 
TypesType: BMNH 1946.8.14.76 (and possibly additional specimens). 
DiagnosisOriginal description: “Körper robust. Daumen der Hinterfüsse (Fig. 28 und 29) wie der der Vorderfüsse verkümmert, jener jedoch mit einer winzigen Kralle, die dem Daumen der Vorderfüsse fehlt. — 52 grosse Femoralporen, die von einer Seite zur anderen in einer unter einem Winkel gebrochenen Linie hinübergehen (bei H. ateles: “il n'y a pas de pores femoraux”). — Rostrale zweimal so breit wie hoch (Fig. 27) (bei H. ateles: “rostrale plus haute que large”), mit drei quer gelagerten Schildern über seinen oberen geraden Querkanten. Kinnschild dreieckig. Längs der inneren Seite der Infralabialia eine Reihe grösserer, später geteilter Submentalia (Fig. 26). — Der glatte Schwanz platt, und, wie bei der vorigen Varietät, an der ursprünglichen, nicht ergänzten, Partie seitlich durch vorragende Spitzen stark sezähnt (Fig. 30, nur an dem ergänzten Theile wie bei dem Pariser Exemplar : “á bords tinement denteles”) — unterhalb mit mauersteinähnlichen kleinen viereckigen Schildchen gepflastert.” (Fischer 1882: 299)

Color (original description): “Oben graubraun, mit undeutlicher dunklerer Marmorierung, etwas dunkler an der Dorsalseite des Kopfes und des Schwanzes; Ventralseite, auch des Schwanzes, einfarbig strohgelb (bei H. ateles: “queue — — dont les bords en dessus comme en dessous sont d'un brun assez vit”).” (Fischer 1882: 299).

Description: A large Perochirus; snout-vent length of mature males 116 mm to 124 mm (2 specimens); habitus stocky, somewhat depressed; snout moderately tapered, tip rounded, its length about 44% of head length; internasal distance about 35% of snout length; head breadth 76% to 86% of head length, and
20 to 22% of snout-vent length; rostral large, quadrangular, broader than long, marked by a median posterior groove; nostril surrounded by rostral, 1st labial, labial, supranasal and two posterior scales; supranasals separated by 1 large scale; 12 upper labials, 8th or 9th beneath center of eye; 11 lower labials; mental triangular, usually smaller than adjacent labials, 3 or 4 rows of somewhat enlarged scales in place of chin shields, anterior scales largest; about 50 to 54 interorbital scale rows; scales on snout and to a lesser degree in the interorbital region enlarged relative to those on dorsal surface of body; scales on dorsal and lateral surfaces of body granular, relatively uniform; enlarged tubercles absent; limbs relatively well-developed, length of hind limb (extended in preserved condition) 88% to 98% of the axilla-groin distance; digits webbed about 1/6 to 1/5 of their length; least webbing between 4th and 5th toes, greatest between 3rd and 4th fingers; fingers and toes, except for 1st, broadly dilated, 1st toe free from second for about 1/2 length of scansor-bearing portion; 23 to 26 scansors beneath 4th toe, 6 or 7 terminal scansors divided, 6 to 7 undivided beneath first toe; all digits but 1st clawed; the distal compressed claw-bearing phalanges, rising from within dilated part on all but 1st toe; compressed phalanges on 2nd through 5th digits, when depressed extend beyond dilated portion for about half the length; a long, medianly arched continuous series of enlarged preanal and femoral scales in pore series extending about 3/4 of length of thigh and bearing a continuous series of about 50 pores in males; pore series followed by several rows of somewhat enlarged scales in preanal region; thighs bordered posteriorly by small scales which do not differ from those on posterior surface of thighs; tail depressed and relatively broad, ventral breadth just posterior to swollen base 63% to 68% of breadth of head; 20± rows of somewhat enlarged and rather squareshaped scales on ventral surface of tail; lateral margin of tail without spines except for a pair at base (Brown 1976). 
Comment 
References
  • Boulenger, G.A. 1885. Catalogue of the lizards in the British Museum (Nat. Hist.) I. Geckonidae, Eublepharidae, Uroplatidae, Pygopodidae, Agamidae. London: 450 pp. - get paper here
  • Brown, Walter C. 1976. Review of the Genus Perochirus (Gekkonidae). Occ. Pap. Cal. Acad. Sci. (126): 1-14 - get paper here
  • Buden, Donald W. & Danko Taboroši 2016. Reptiles of the Federated States of Micronesia. Island Research and Education Initiative, 311 pp. - get paper here
  • Fischer, J. G. 1882. Herpetologische Bemerkungen. I. Bemerkungen über einzelne Stücke der Schlangensammlung des kön. Zoologischen Museums in Dresden. . II. Neue Eidechen aus Australien und Polynesien. Archiv für Naturgeschichte 48: 281-302 - get paper here
  • Goldberg, S R; 2019. Perochirus scutellatus (Giant Micronesian Gecko) Reproduction. Herpetological Review 50 (1): 143 - get paper here
  • Rösler, H. 2000. Kommentierte Liste der rezent, subrezent und fossil bekannten Geckotaxa (Reptilia: Gekkonomorpha). Gekkota 2: 28-153
  • Wiles, G.J. 2004. A Record of Perochirus cf. scutellatus (Squamata: Gekkonidae) from Ulithi Atoll, Caroline Islands. Micronesica 37 (1):163-166
 
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