Fantastic lizards and where to find them: cis-Andean microteiids (Squamata: Alopoglossidae & Gymnophthalmidae) from the Colombian Orinoquia and Amazonia Author Diago-Toro, María F. Programa de Biología, Facultad de Ciencias Básicas y Tecnologías, Universidad del Quindío, Armenia, Quindío, Colombia. Author García-Cobos, Daniela Subdirección de Investigaciones, Colecciones Biológicas, Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, carrera 8 # 15 - 08, Claustro de San Agustín, Villa de Leyva, Boyacá, Colombia. Author Brigante-Luna, Giovanni D. 0000-0001-6823-2383 Grupo de investigación de Biodiversidad del Caribe Colombiano, Semillero de Herpetología, Programa de Biología, Universidad del Atlántico. https: // orcid. org / 0000 - 0001 - 6823 - 2383 Author Vásquez-Restrepo, Juan D. Programa de Posgrado en Ciencias Biológicas, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad de México, México. text Zootaxa 2021 2021-11-11 5067 3 377 400 journal article 3574 10.11646/zootaxa.5067.3.3 937e9cfe-ea1e-4891-b147-91ab13a31d78 1175-5326 5681919 F64E5226-B4DD-44A3-A83E-E05928B82F4B Alopoglossus atriventris Duellman, 1973 Distribution: Western Amazon in Brazil , Peru , Ecuador , and Colombia ( Ribeiro-Júnior & Amaral 2017 ). In Colombia there are records for the Amazon foothills in Putumayo and Meta departments, and southward to Leticia in Amazonas ( Fig. 4A ). Similar species: Alopoglossus atriventris is easily distinguished from other similar and sympatric species of the genus by lacking occipital scales (present in A. bicolor and A. brevifrontalis ); small granular scales on the sides of the neck (keeled, imbricated and similar in shape to dorsals in A. avilapiresae ); and in having distinctly or weakly keeled ventral scales (smooth in A. buckleyi ). For a more detailed description see Ribeiro-Júnior et al. (2020) . Remarks: It has been suggested that this species has sexual dimorphism in the coloration as males are characterized by having black chin, throat and belly, whereas females are cream ( Duellman 1973 ). In this study we extend the known distribution of Alopoglossus atriventris to the municipality of La Macarena, Meta which is ca. 266 km NE to the previous northernmost known record in Colombia . Alopoglossus avilapiresae Ribeiro-Júnior et al. , 2020 Distribution: Western Amazon in Brazil , Peru , and southern Colombia ( Ribeiro-Júnior et al. 2020 ). The only known records for Colombia are from Leticia municipality in the Amazonas department ( Fig. 4A ). Similar species: Alopoglossus avilapiresae differs from other similar species by lacking occipital scales (present in A. bicolor and A. brevifrontalis ); in having non-granular, keeled and imbricated scales on the flanks of the neck, different in shape to those near the tympanic aperture (small granular scales in A. atriventris and A. buckleyi ). For a more detailed description see Ribeiro-Júnior et al. (2020) .