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Chatogekko amazonicus (ANDERSSON, 1918)

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Higher TaxaSphaerodactylidae, Gekkota, Sauria, Squamata (lizards: geckos)
Subspecies 
Common NamesPortuguese: Lagartixa, Lagartixinha 
SynonymSphaerodactylus amazonicus ANDERSSON 1918: 1
Coleodactylus amazonicus — VANZOLINI 1957: 6
Coleodactylus guimaraesi VANZOLINI 1957: 8
Coleodactylus zernyi WETTSTEIN 1928: 110
Coleodactylus amazonicus — RÖSLER 1995: 165
Coleodactylus guimaraesi — RÖSLER 2000
Coleodactylus amazonicus — AVILA-PIRES & HOOGMOED 2000: 222
Coleodactylus amazonicus — PIANKA & VITT 2003: 110
Chatogekko amazonicus — GAMBLE et al. 2011
Chatogekko amazonicus — RÖSLER 2015
Chatogeckko amazonicus — VAZ-SILVA et al. 2015 (in error) 
DistributionBrazil (Roraima, Amazonas, Amapa, Para, Rondonia, Acre),
S Venezuela, S Guyana, French Guiana, Suriname, Bolivia ?

Type locality: Roraima, Amazonas, Manaos, Lago Poraquecuare, Brazil.  
Reproductionoviparous 
TypesHolotype: NRM 3254 
DiagnosisDiagnosis (genus): Diagnosis and description: A miniaturized species complex of diurnal sphaerodactyl geckos. Mean SVL 21 ± 1.8 mm, N = 41. Snout shortened. Pupil round. Body cylindrical. Dorsal scales keeled. Claws enclosed in ungual sheath consisting of four scales. Posterior edge of premaxilla contacts medial process of frontal bone. Posterior edge of ascending nasal process bifurcated. Palatine longer than vomer. Postparietal process of parietal in contact with supraoccipital and otooccipital, but not squamosal. Reduced paroccipital process located dorsally to fenestra ovalis.
Chatogekko is distinguished from all gekkotans by the following unique combination of characters: (1) between two and four loreal scales (ls, Fig. 4A, also present in some Sphaerodactylus); (2) claws enclosed in an ungual sheath consisting of four scales (Parker, 1926; Vanzolini, 1957; Avila-Pires, 1995): inner supero-lateral (isl, Fig. 4B), outer supero-lateral (osl, Fig. 4B), inner infero-lateral (iil, Fig. 4C), and outer infero-lateral (oil, Fig. 4C) (ventrolaterals sensu Kluge, 1995); (3, Fig. 4D) keeled scales on dorsal body surface (Vanzolini, 1957; Avila-Pires, 1995), also present in some Sphaerodactylus; (4, Fig. 5A) bony external nares large and entering or approaching contact between prefrontal and nasals (as a consequence of extensive overlapping contact of maxilla and prefrontal); (5, Fig. 5A) posterior edge of premaxilla (i.e. the ascending nasal process) contacts medial process of frontal bone (Daza et al., 2008); (6, Fig. 5A) posterior edge of ascending nasal process bifurcated; (7, Fig. 5A) internasal contact absent; (8, Fig. 5A) jugal bone vestigial and limited to tip of maxilla; (9, Fig. 5A) postparietal process of parietal contacting supraoccipital and otooccipital, but not squamosal; (10, Fig. 5A) paroccipital process of otooccipital not visible in dorsal view; (11, Fig.5B) paroccipital process very reduced and located dorsally to fenestra ovalis (instead of posterior as in other gekkotans) and not participating in quadrate articulation (paroccipital abutting); (12, Fig. 5B) palatine exceeds vomer substantially in length; (13, Fig. 10) duplicipalatinate condition; (14) a 3-bp deletion in coding region of exon 8 (in Gallus) of RBMX; and (15) a 3-bp deletion in coding region of exon 13 (in Gallus) of PTPN12 [from GAMBLE et al. 2011]. 
CommentType species: Sphaerodactylus amazonicus ANDERSSON 1918 is the type species of the genus Chatogekko GAMBLE et al. 2011.

Synonymy: GAMBLE et al. also discussed the possibility that Coleodactylus guimaraesi VANZOLINI 1957 and Coleodactylus zernyi WETTSTEIN 1928 are valid species of Chatogekko and represent opulations from the southwestern and eastern Amazon, respectively.

Distribution: Presence in Bolivia unclear (Tiffany Doan, pers. comm.).

Reference images: see Uetz et al. 2024 for high-resolution reference images for this species. 
EtymologyNamed after the type locality. 
References
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  • Avila-Pires, Teresa C.S.; Kleiton R. Alves-Silva, Laís Barbosa, Fabrício S. Correa, Jorge F. A. Cosenza, Ana Paula V. Costa-Rodrigues, Aurea A. Cronemberger, Marinus S. Hoogmoed, Geraldo R. Lima-Filho, Adriano O. Maciel, Alexandre F. R. Missassi, Lyw 2018. Changes in Amphibian and Reptile Diversity Over Time in Parque Estadual do Utinga, a Protected Area Surrounded by Urbanization. Herpetology Notes 11: 499-512 - get paper here
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