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Higher TaxaGymnophthalmidae (Cercosaurinae, Bachiinae), Sauria, Gymnophthalmoidea, Squamata (lizards)
Common NamesPortuguese: Lagarto-Ápodo, Lagarto-sem-Pata 
Bachia cacerensis — GAINSBURY & COLLI 2003 
DistributionBrazil (Mato Grosso, Rondônia)

Type locality: surroundings of the hydroeletric powerplant AHE Cachoeirão (13° 32’S; 58° 48’W), Juruena river, Sapezal municipality, state of Mato Grosso, Brazil.  
Reproductionoviparous (not imputed, fide Zimin et al. 2022) 
TypesHolotype: UFMT 6755 (Figs. 1, 2 and 3), an adult male, collected by B. Rondon on September 2006. 
DiagnosisDiagnosis: Bachia didactyla sp. nov. belongs to the group of B. bresslaui by having keeled, pentagonal, lance- olate dorsal scales; smooth and lanceolate lateral scales; smooth and quadrangular ventral scales, juxtaposed later- ally and imbricate posteriorly; lanceolate tail scales, imbricate and keeled both dorsally and laterally, and smooth ventrally. Interparietal, supraocular, and superciliars present; 47–49 dorsals; 36–39 ventrals, 34–37 scales around midbody. Femoral pores 1-1 or 2-2 in males, absent in females; precloacal pores 1-1 in males and in females. Snout slightly prominent, covering the lower jaw in dorsal view. Two fingers with claws in each forelimb. Hind limbs stiliform, each of them ending in an apical scale without claw. Six supralabials, the fifth the largest, separated from the parietal by two scales: a postocular, and a temporal; sixth supralabial separated from the parietal by three tem- poral scales. Five infralabials, the first the smallest, contacting mental, second infralabial, and postmental in ante- rior, posterior, and ventral margins, respectively; second supralabial the largest, twice longer than wide, contacting postmental and first pair of gular scales ventrally; third infralabial square, forth and fifth of similar size and elon- gate, all contacting the second pair of gular scales; a pair of anterior temporals contacting postocular; two rows of posterior temporals; first row with three temporals: the first the largest, contacting the parietal; second of interme- diate size, and the third the smallest; second row of posterior temporals with two scales, both contacting parietal. Two supraoculars, visible both in dorsal and lateral views; the first the largest, longer than wide, contacting super- ciliary scales, second supraocular, frontonasal, preocular, and frontal scales; second smaller than first, contacting parietal, postocular, and slightly contacting frontal. The anterior margin of first supraocular is one-quarter smaller than anterior margin of the contacting frontal. Bachia didactyla sp. nov. differs from B. panoplia, B. pyburni, and B. scolecoides by the absence of prefrontals (present and in broad contact at midline in the first two species, and small and not in contact at midline in B. scole- coides). Bachia didactyla sp. nov. shares with B. bresslaui, B. micromela, B. oxyrhina, B. psamophila, and B. cac- erensis the absence of prefrontals. Nevertheless, it differs from these taxa by having two clawed fingers in fore limbs, instead of stiliform fore limbs ending with a single apical scale (as observed in the first four species) or api- cal scales without claws (as in B. cacerensis). Additionally, hind limbs are also stiliform in B. didactyla sp. nov., each of them ending in an apical scale without claw, while in B. psamophila they have four flat clawed fingers.
The fifth and sixth supralabials are separated from the parietal by a large postocular, as well as by temporal scales in Bachia didactyla sp. nov. In contrast, B. psamophila has an elongate sixth supralabial contacting the pari- etal; B. oxyrhina has six supralabials, the fifth contacting the parietal; B. micromela has a narrow postocular, and the fifth supralabial is taller than wide, contacting the parietal. 
EtymologyThe specific epithet derives from Greek (“di” = two, “dactylo” = digit). The presence of two fingers is the most striking character distinguishing the new species among other members of the bresslaui group. 
  • FREITAS, JOSEANA LUISA DE; CHRISTINE STRÜSSMANN, MARCOS ANDRÉ DE CARVALHO, RICARDO ALEXANDRE KAWASHITA-RIBEIRO & TAMÍ MOTT 2011. A new species of Bachia Gray, 1845 (Squamata: Gymnophthalmidae) from the Cerrado of Midwestern Brazil. Zootaxa 2737: 61–68 - get paper here
  • Gonzalez R. C. et al. 2020. Lista dos Nomes Populares dos Répteis no Brasil – Primeira Versão. Herpetologia Brasileira 9 (2): 121 – 214 - get paper here
  • RIBEIRO-JÚNIOR, MARCO A. & SILVANA AMARAL 2017. Catalogue of distribution of lizards (Reptilia: Squamata) from the Brazilian Amazonia. IV. Alopoglossidae, Gymnophthalmidae. Zootaxa 4269 (2): 151-196 - get paper here
  • TEIXEIRA JR, MAURO; RENATO SOUSA RECODER, AGUSTÍN CAMACHO, MARCO AURÉLIO DE SENA, CARLOS ARTURO NAVAS & MIGUEL TREFAUT RODRIGUES 2013. A new species of Bachia Gray, 1845 (Squamata: Gymnophthalmidae) from the Eastern Brazilian Cerrado, and data on its ecology, physiology and behavior. Zootaxa 3616 (2): 173–189 - get paper here
  • Zimin, A., Zimin, S. V., Shine, R., Avila, L., Bauer, A., Böhm, M., Brown, R., Barki, G., de Oliveira Caetano, G. H., Castro Herrera, F., Chapple, D. G., Chirio, L., Colli, G. R., Doan, T. M., Glaw, F., Grismer, L. L., Itescu, Y., Kraus, F., LeBreton 2022. A global analysis of viviparity in squamates highlights its prevalence in cold climates. Global Ecology and Biogeography, 00, 1–16 - get paper here
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