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 Nota bene: A binomial