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A New Genus and Species of Lizard (Reptilia: Scincidae) from New Caledonia, Southwest Pacific!

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A New Genus and Species of Lizard (Reptilia: Scincidae) from New Caledonia, Southwest Pacific! Pacific Science (1997), vol. 51, no. 1: 91-96 © 1997 by University of Hawai'i Press. All rights reserved A New Genus and Species of Lizard (Reptilia: Scincidae) from New Caledonia, Southwest Pacific! Ross A. SADLIER2 AND AARON M. BAUER3 ABSTRACT: An unusual new lygosomine skink, Simiscincus aurantiacus Sadlier & Bauer, n. sp., is described from a single specimen collected in southern New Cale­ donia. This species is a member of the Eugongyius group of skinks, but is not readily assignable to any known genus. It has a number of derived characteristics that serve to distinguish it, the most notable of which is the highest number of premaxillary teeth of any scincid. Although its relationships cannot, at present, be established unambiguously, it appears to share affinities with another monotypic endemic New Caledonian genus, Graciliscincus. The discovery of this species high­ lights the extreme diversity and endemicity of the New Caledonian lizard fauna. THE TERRESTRlAL HERPETOFAUNA of New Cale­ Simiscincus Sadlier & Bauer, n. genus donia is extremely diverse and highly endemic (Bauer and Vindum 1990, Bauer and Sadlier TYPE SPECIES: Simiscincus aurantiacus Sad­ 1993) and is dominated by carphodactyline lier & Bauer, n. sp., here designated. geckos and lygosomine skinks of the Eugongy­ ius group. Many of the New Caledonian lizards are apparently restricted to small regions of the DIAGNOSIS: Simiscincus is diagnosed as a island as a whole. Indeed, a recent review of member of the Eugongyius group of skinks as the status of the lizard fauna of New Caledonia defined by Greer (1979): the parietals meet identified almost half the species either as mod­ behind the interparietal; the parietal is bordered erately well known but restricted in distribution along its posterior edge by an upper secondary or as known from only a few specimens from temporal and transversely enlarged nuchal scale; one or a few localities (Bauer and Sadlier 1993). medial preanal scales more or less subequal in Among the latter are several morphologically size to and overlapped by more lateral preanals; bizarre lygosomine skink species, Phoboscincus and the scales on the dorsal surface of fourth bocourti (Brocchi), Geoscincus haraidmeieri toe are in a single row throughout the length of (Bohme), and Graciliscincus shonae Sadlier, the digit. that show a number of unusual characteristics Simiscincus can be distinguished from other in scalation and body form and do not resemble genera in the Eugongyius group by the following any other species in the Eugongyius group of unique combination ofcharacters: depressed and skinks (Sadlier 1986). Recent fieldwork has elongate body form; supranasal present as a pre­ revealed the presence of another unusual New nasal crease and postnasal suture; loreal single; Caledonian skink known from only a single lower eyelid with a semitransparent disk; ear specimen. This lizard cannot be readily assigned opening lacking auricular lobules; paravertebral to any existing group of species and is here scales 99; premaxillary teeth 19; presacral verte­ described as the sole representative of a new brae 29; atlantal arches fused to intercentrum. genus. ETYMOLOGY: The generic name Simiscincus I Manuscript accepted 29 August 1995. is derived from a combination ofthe Latin simus 2 Section of Herpetology, Australian Museum, 6-8 Col­ lege Street, Sydney 2000, NSW, Australia. for pug-nosed, referring to the broad, blunt snout 3 Department ofBiology, Villanova University, 800 Lan­ characteristic of the type species of the genus, caster Avenue, Villanova, Pennsylvania 19085. and the Latin scincus for scincid lizard. 91 92 PACIFIC SCIENCE, Volume 51, January 1997 REMARKS: Greer (1979) regarded nine pre­ number of 19 premaxillary teeth in Simiscincus maxillary teeth as primitive for lygosomine is, however, clearly derived compared with the skinks, with conditions deviating from that, 13 premaxillary teeth in Graciliscincus. either higher or lower, considered derived. Among the Australasian lygosomines, the Tili­ qua and Sphenomorphus groups characteristi­ Simiscincus aurantiacus Sadlier & Bauer, n. cally have nine or fewer premaxillary teeth, sp. whereas most genera in the Eugongylus group, Figure 1, Plate I including most New Caledonian skink genera, have 11 premaxillary teeth, which is here consid­ TYPE MATERIAL: Holotype: Australian Museum ered the primitive condition for the Eugongylus (AM) RI44356, male, Mount Koghis (500 m asl), group. Certain genera within the Eugongylus New Caledonia, 220 10' S, 1660 30' E, collected group deviate from this primitive tooth condi­ by R. Sadlier, August 1994. tion, generally by having an elevated number of either 13 (the Australian genera Lampropholis ETYMOLOGY: The name aurantiacus is derived and Carlia and the New Caledonian genus from the New Latin adjective for orange and refers Marmorosphax) or 15 (the Australian genus Lyg­ to the bright enamel orange ventral and lower lateral isaurus). Simiscincus is unique among the surfaces of this species (see Plate 1). Eugongylus group of skinks in having an excep­ tionally high number of premaxillary teeth (19). Simiscincus appears to be most closely DIAGNOSIS: Species diagnosis same as for related to the monotypic New Caledonian Graci­ genus. liseincus. Both genera share a fusion ofthe atlan­ tal arches to the intercentrum (A. Greer, pers. DESCRIPTION: Measurements and propor­ comm.), elongate bodies and markedly reduced tions: Body form elongate with limbs and digits limbs (hind limb length 20-25% of snout-vent small. Snout to vent length (SVL) 85 mm; dis­ length in Graciliscincus, 30% in Simiscincus), tance from axilla to groin 49 mm (57.6% of broad snouts characterized by wide frontonasal SVL); distance from forelimb to snout 32 mm scales (more than twice as broad as long), and (37.6% ofSVL); hind limb length 25.5 mm (30% several other unusual features of head scalation of SVL). including an enlarged nasal scale and moderately Scalation (methodology follows Sadlier 1986): small and widely separated prefrontal scales. Frontonasal more than twice as broad as long (W/ This suite of shared derived characters is highly L = 225%); prefrontals moderately large and mod­ suggestive, but an assessment of the relation­ erately separated; frontal nearly as broad as long ships of all members of the Eugongylus group r.:wIL = 88%); frontoparietals distinct; interparietal that share a fusion of the elements of the atlantal distinct; parietals each bordered by a single nuchal vertebrae (= Pseudemoia subgroup of Greer and upper secondary temporal scale; temporal 1990) is required before a definitive determina­ scales framented, primary temporal single on right tion of the relationships of Simiscincus can be side, fragmented on left to form two equal-sized made. It is interesting that both species have scales; upper and lower secondary temporals each retained the primitive arrangement of paired single; tertiary temporals three on each side; two frontoparietal shields. postlabials on each side. In other aspects of their morphology, Simi­ Nasals large and moderately separated, each scincus and Graciliscincus differ markedly, and with a prenasal crease and postnasal suture; sin­ in general Simiscincus appears to be the more gle loreal on either side, nearly twice as long as primitive of the two. Simiscincus has a large ear deep (WIL 62.5-70%), a small semilunar scale opening, a condition considered primitive to the positioned anterodorsally on the right loreal par­ diminutive ear opening of Graciliscincus. Simi­ tially separating contact between the loreal and scincus has only 29 presacral vertebrae, whereas nasal; upper and lower preoculars present; two in Graciliscincus, with 36 presacral vertebrae, anterior suboculars; six supraciliaries (third and this character is highly derived. The elevated fourth fused on right) or seven; seven upper FIGURE I. Lateral and dorsal views of the head of the holotype of S. aurantiacus. n. genus, n. sp. (scale bar = 5 mm). FIGURE 2. Closed foresl habitat on Mount Koghis in the vicinity of the type locality for Simiscincus aurantiacus, n. genus, n. sp. PLATE I. Holotype of Simiscincus aural1/iacus, n. genus, n. sp., showing dorsal and lateral coloration (above) and ventral coloration and markings (below). New Skink from New Caledonia-SADLIER AND BAUER 95 labials, last on either side divided obliquely to Distribution and Habitat form two equal-sized scales as large as adjacent primary temporal and upper postlabials; six The specimen was collected from beneath lower labials, postmental contacting first or sec­ a small rock on a rocky hillslope in mid­ ond (at suture between first and second on left); altitude closed forest on Mount Koghis (Figure two chin shields, first pair in broad contact. 2). Upon being uncovered, it moved quickly, Lower eyelid with an obvious, centrally with a sliding motion, through cracks and located semitransparent disk, length ca. 45% of crevices in the soil beneath the rock. Mount total eye length. Ear opening moderately large Koghis is located ca. 15-20 km northeast of the New Caledonian capital of Noumea, on and lacking lobules, tympanum deeply recessed. the western edge of the southern block of the Body scales smooth, midbody scale rows 38; central mountain chain of the island. The area paravertebral scales (from parietals to opposite receives 1500-2000 mm of rain per annum vent) 99. Nine scales on top of fourth finger; and is characterized, as is most of the southern lamellae beneath fourth finger 12-13, basal por­ third of the island, by ultrabasic rocks (Sautter tion of fingers joined with a webbing of skin 1981). Although adjacent areas support the that extends to the third basal scale when viewed highly endemic maquis vegetation typical of from above; 13 scales on top offourth toe; 27-28 southern New Caledonia, much of Mount broad lamellae beneath fourth toe. Koghis supports climax humid forest with a Osteology: Premaxillary teeth 19; maxillary canopy height of 30-35 m (Virot 1956, Schmidt teeth 36-37; dentary teeth 47; presacral verte­ 1981). On the rocky slope where the specimen brae 27; phalangeal formula for manus and pes of Simiscincus auriantiacus was captured, the 2.3.4.5.3 and 2.3.4.5.4, respectively.
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