Adercosaurus vixadnexus MYERS & DONNELLY, 2001
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Adercosaurus vixadnexus
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| Higher Taxa | Gymnophthalmidae (Ecpleopodinae), Sauria, Gymnophthalmoidea, Squamata (lizards) |
| Subspecies | |
| Common Names | |
| Synonym | Adercosaurus vixadnexus MYERS & DONNELLY 2001 Adercosaurus viadneus [sic] — BARRIO-AMOROS & BREWER-CARIAS 2008 |
| Distribution | Venezuela (NW Tepuis region) Type locality: wet gallery forest on Cerro Yutajé, 1700 m elevation (5°46’N, 66°08’W), Amazonas, Venezuela. |
| Reproduction | oviparous |
| Types | Holotype: EBRG 3126 (field no. CWM 19809), an adult male; collected February 25, 1995, AMNH–TERRAMAR Expedition. See locality 1 on map (fig. 1). |
| Diagnosis | Diagnosis: Small lizards, maximum size probably less than 80 mm SVL, with tail probably less than twice body length. Tongue anteriorly and posteriorly bearing oblique, anteriorly converging plicae, with intervening midsection of imbricate scalelike papillae; three pairs of nonswollen chrevron-shaped infralingual plicae. Pterygoid teeth present. Phalangeal formulae 2-3- 4-5-3 for hands, 2-3-4-5-4 for feet. Hemi- penis lacking spines or spinules, symmetrically bifurcate, with thickened, lobate apical discs; asulcate side of hemipenis with encircling nude ridges. Head scales smooth. Nasal scales separated by rostral and undivided frontonasal. Loreal separated from labials by frenocular. Supraoculars separated from eyelids by a complete superciliary series; anterior superciliary large, not expanded dorsally. Translucent palpebral disc composed of about six vertical panes. Frontoparietals medially in point contact. Interparietal longer than parietals, their common sutures forming a jagged line across rear of head. Tympanum slightly recessed, lightly pigmented. Single postmental scale followed by three pairs of genials in contact with labials. Anterior gular crease, incomplete guttural fold, and collar fold all conspicuous. Paramedian gulars enlarged, in short double row. Dorsal and lateral scales elongate with parallel sides, hexagonal, in transverse rows only; dorsals sharply keeled, strongly mucronate, laterals becoming less so. Lateral fold absent, a gradation between lateral and ventral scales; median ventrals smooth, rectangular, gently rounded posteriorly, subimbricate, forming both transverse and longitudinal rows. Pre-anal scales in two rows. Femoral pores and preanal pores on same line. Limbs pentadactyl, all digits clawed; subdigital lamellae divided; base of pollex with enlarged thenar scales having produced median keels. Caudal scales similar to body scales, in uninterrupted annuli, no paramedian series of supracaudals along a vertebral suture. |
| Comment | Type species: Adercosaurus vixadnexus MYERS & DONNELLY 2001 is the type species of the genus Adercosaurus MYERS & DONNELLY 2001. Subfamily: the subfamilial classification of this genus is still unresolved (T. Doan, pers. comm., 2 Jun 2014). For diagnostic morphological characters distinguishing Marinussaurus, Amapasaurus, Anotosaura, Arthrosaura, Colobosauroides, Dryadosaura,Ecpleopus, Kaieteurosaurus, Leposoma, and Pantepuisaurus see Table 2 in PELOSO et al. 2011. Abundance: only known from the type locality (Meiri et al. 2017). This is one of the species called 'lost' and 'rediscovered' by Lindken et al. 2024. |
| Etymology | Named after the Latin adverb vix (barely, hardly) and the passive past participle adnexus (tied together or joined, connected), calling attention to the possibly diagnostic point contact of the frontoparietal plates (fig. 34 in MYERS & DONNELLY 2001). The genus was named after the Greek aderkes (something unexpected or unseen), and sauros—an unexpected lizard. Gender masculine. |
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