Chironius

Chironius is a genus of New World colubrid snakes, commonly called sipos (from the Portuguese word cipó for liana), savanes, or sometimes vine snakes. There are 23 described species in this genus.

==Species== The following 23 species are recognized as being valid. Chironius bicarinatus (Wied, 1820) – two-headed sipo Chironius brazili Chironius carinatus (Linnaeus, 1758) – Amazon coachwhip Chironius challenger Kok, 2010 Chironius diamantina Chironius exoletus (Linnaeus, 1758) – Linnaeus's sipo Chironius flavolineatus (Boettger, 1885) – Boettger's sipo Chironius flavopictus Chironius foveatus Bailey, 1955 – South American sipo Chironius fuscus (Linnaeus, 1758) – brown sipo Chironius gouveai Entiauspe-Neto, Lúcio-Lyra, Koch, Marques-Quintela, Diesel-Abegg & Loebmann, 2020 – Gouvea's sipo Chironius grandisquamis (W. Peters, 1869) – Ecuador sipo Chironius laevicollis (Wied, 1824) – Brazilian sipo Chironius laurenti Dixon, Wiest & Cei, 1993 Chironius leucometapus – yellow-headed sipo Chironius maculoventris – central sipo Chironius monticola Roze, 1952 – mountain sipo Chironius multiventris Schmidt & Walker, 1943 – long-tailed machete savane Chironius quadricarinatus (F. Boie, 1827) – central sipo Chironius scurrulus (Wagler, 1824) – Wagler's sipo, smooth machete savane Chironius septentrionalis Dixon, Wiest & Cei, 1993 – South American sipo Chironius spixii Chironius vincenti (Boulenger, 1891) – St. Vincent blacksnake