Exiliboa placata BOGERT, 1968

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Higher Taxa	Boidae (Charinaidae, Ungaliophiinae), Henophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies
Common Names	E: Oaxacan Dwarf Boa G: Oaxaca-Zwerg Boa S: Boa Enana Oaxaqueña
Synonym	Exiliboa placata BOGERT 1968: 6 Exiliboa placata — LINER 1994 Exiliboa placata — MCDIARMID, CAMPBELL & TOURÉ 1999: 215 Exiliboa placata — GOWER et al. 2012: 65 Exiliboa placata — WALLACH et al. 2014: 293 Exiliboa placata — REYNOLDS & HENDERSON 2018: 31
Distribution	Mexico (Oaxaca) Type locality: 17°37’N, 96°25’W on the headwaters of the Rio Valle Nacional, northern slopes of the Sierra de Juárez, elevation 2300 m.
Reproduction	ovovivparous
Types	Holotype: AMNH 100 000, female
Diagnosis	DIAGNOSIS (GENUS): “A small, nearly unicolored, prehensile-tailed boa, characterized by its possession of a large azygous internasal in broad contact with the rostral, and flanked on each side by a single nasal. This peculiar configuration of the scales readily distinguishes Exiliboa from Ungaliophis and from Tropidophis, al members of which have paired internasals and divided nasal plates (fig. 1). Exiliboa retains a pair of prefrontals in contrast to the azygous prefrontal of Ungaliophis, and the two pairs of prefrontals normally present on Tropidophis. The loreal is retained by Exiliboa, whereas it is absent from, or fused with the anterior prefrontal of, Tropidophis. The mental groove of Exiliboa is bordered by only three pairs of shields, but the groove is bordered by four scales in Ungaliophis and by four or five in Tropidophis. Furthermore, the female of Exiliboa differs from that of other dwarf boas in its retention of external vestiges of limbs. “ (Bogert 1968)
Comment	Higher Taxa: Wilcox et al. (2002) extablished a new family for Exiliboa and Ungaliophis, Ungaliophiidae, based on DNA sequence analysis. More recent authors (e.g. Pyron et al. 2013) grouped Exiliboa, Ungaliophis, Charina, and Lichanura into Ungaliophiinae which is basal to most other boids. Type species: Exiliboa placata BOGERT 1968 is the type species of the genus Exiliboa BOGERT 1968.
References	Bogert, Charles M. 1968. A new genus and species of Dwarf Boas from Southern Mexico. American Museum Novitates (2354): 1-38 - get paper here Campbell J A; Camarillo R J L 1992. The Oaxacan dwarf boa, Exiliboa placata (Serpentes, Tropidophiidae): descriptive notes and life history. Carib. J. Sci. 28: 17-20 Casas-Andreu, G., F.R. Méndez-De la Cruz and X. Aguilar-Miguel. 2004. Anfibios y Reptiles; pp. 375–390, in A.J.M. García-Mendoza, J. Ordoñez and M. Briones-Salas (ed.). Biodiversidad de Oaxaca. Instituto de Biología, UNAM-Fondo Oaxaqueño para la Conservación de la Naturaleza-World Wildlife Fund, México, D. F. Gower, D.; Garrett, K. & Stafford, P. 2012. Snakes. Firefly Books, Buffalo, NY,<br />144 p.. Heimes, P. 2016. Snakes of Mexico. Chimaira, Frankfurt, 572 pp Johnson, J. D., L. D. Wilson, V. Mata-Silva, E. García-Padilla, and D. L. DeSantis. 2017. The endemic herpetofauna of Mexico: organisms of global significance in severe peril. Mesoamerican Herpetology 4(3): 544–620 - get paper here Mata-Silva, Vicente, Jerry D. Johnson, Larry David Wilson and Elí García-Padilla. 2015. The herpetofauna of Oaxaca, Mexico: composition, physiographic distribution, and conservation status. Mesoamerican Herpetology 2 (1): 6–62 - get paper here McDiarmid, R.W.; Campbell, J.A. & Touré,T.A. 1999. Snake species of the world. Vol. 1. [type catalogue] Herpetologists’ League, 511 pp. O’Shea, M. 2018. The Book of Snakes. Ivy Press / Quarto Publishing, London, - get paper here Reynolds, R. Graham and Robert W. Henderson 2018. Boas of the World (Superfamily Booidae): A Checklist With Systematic, Taxonomic, and Conservation Assessments. Bulletin of the Museum of Comparative Zoology Sep 2018, Vol. 162, No. 1: 1-58. - get paper here Underwood, G. 2002. On the rictal structures of some snakes. Herpetologica 58 (1): 1-17 - get paper here Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. [type catalogue] Taylor and Francis, CRC Press, 1237 pp. Wilcox, T.P.; Derrick J. Zwickl; Tracy A. Heath and David M. Hillis 2002. Phylogenetic relationships of the dwarf boas and a comparison of Bayesian and bootstrap measures of phylogenetic support. Molecular Phylogenetics and Evolution 25 (2): 361-371 - get paper here
External links	IUCN Red List National Center for Biotechnology Information Google images

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