Chironius laevicollis

Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Lepidosauromorpha
Superordo: Lepidosauria
Ordo: Squamata
Subordo: Serpentes
Infraordo: Caenophidia
Superfamilia: Colubroidea

Familia: Colubridae
Subfamilia: Colubrinae
Genus: Chironius
Species: Chironius laevicollis
Name

Chironius laevicollis (Wied, 1824)
Synonyms

Coluber laevicollis Wied, 1824
Erpetodryas laevicolis (Wied) — Boie, 1826
Herpetodryas laevicollis (Wied) — Wagler, 1830
Hylophis laevicollis (Wied) — Fitzinger, 1843
Herpetodryas carinatus (not of Linnaeus) — Boulenger, 1894
Chironius laevicollis (Wied) — Bailey, 1955
Chironius laevicollis — Hollis, 2006

References

Wied-Neuwied, M. 1824. Verzeichniss der Amphibien, welche im zweiten Bande der Naturgeschichte Brasiliens vom Prinz Max von Neuwied werden beschrieben werden. Isis von Oken, 1:661—673 [columns].
Marques, O.A.V. & Sazima, I. 2003. Ontogenetic color changes may strengthen suggestion about systematic affinities between two species of Chironius (Serpentes, Colubridae). Phyllomedusa, 2 (1): 65–68.
Hollis, J.L. 2006. Phylogenetics of the genus Chironius Fitzinger 1826 (Serpenes, Colubridae) based on morphology. Herpetologica, 62 (4): 435–452.
Chironius laevicollis at the New Reptile Database. Accessed on 22 August 2008.

Vernacular names
English: Brazilian Sipo