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Corallus caninus (LINNAEUS, 1758)

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Higher TaxaBoidae (Boinae), Henophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Emerald Tree Boa
G: Hundskopfschlinger, Grüne Hundskopfboa
Portuguese: Araboia, Araraboia, Araramboia, Cobra-Papagaio, Cobra-Verde, Periquitaboia, Periquitamboia 
SynonymBoa canina LINNAEUS 1758: 215
Boa Hipnale LINNAEUS 1758: 215
Boa thalassina LAURENTI 1768: 89 (nomen subst. pro Boa canina LINNAEUS).
Boa aurantiaca LAURENTI 1768: 89
Boa exigua LAURENTI 1768: 89 (nomen substitutum pro Boa hipnale)
Boa canina — SHAW & NODDER 1790
Xiphosoma araramboya WAGLER 1824: 45
Xiphosoma caninum — DUMÉRIL & BIBRON 1844: 540
Xiphosoma caninum — JAN 1864
Xiphosoma caninum — LOCKINGTON 1886: 300
Corallus caninus — BOULENGER 1893: 102
Boa canina — BEEBE 1946: 16
Corallus caninus — STIMSON 1969
Corallus caninus — GASC & RODRIGUES 1980
Corallus canina — MEHRTENS 1987
Corallus caninus — STARACE 1998: 94
Corallus caninus — MCDIARMID, CAMPBELL & TOURÉ 1999: 190
Corallus caninus — WALLACH et al. 2014: 183
Corallus caninus — REYNOLDS & HENDERSON 2018: 17
Corallus caninus — NOGUEIRA et al. 2019 
DistributionGuyana, Suriname, French Guiana, E/S Venezuela (Bolívar, Amazonas), NE Brazil (north of the Rio Amazonas and north and east of the Rio Negro: Amapá, Pará, Roraima, Amazonas); elevation 0-200 m.

Type locality: "America".  
TypesHolotype: NRM (also as NRS) Lin. 8
Lectotype: ZSM 1365/0, female [Xiphosoma araramboya] 
DiagnosisDiagnosis: Distinguishable from all other species of Corallus (except C. batesii) based on its green dorsal ground color with enamel-white markings on the dorsum (dorsum occasionally immaculate green, devoid of any white markings); juveniles usually red-orange (rarely green) with enamel-white markings (other species of Corallus have dorsal ground colors of various shades of gray, brown, red, and yellow as adults, always with patterns consisting of more than just white markings). It differs from C. batesii by reduced number of scales across snout at level of the suture between third and fourth supralabials (2–6, mean = 3.4 +/- 1.1 in C. caninus; 3–12, mean = 6.9 +/- 1.6 in C. batesii), absence of mid-dorsal longitudinal stripe (present or absent in C. batesii), and absence or near-absence of lateral blotches (0–11, mean = 1.3 +/- 2.7 in C. caninus; 0–38, mean = 18.1 +/- 8.2 in C. batesii). Juvenile dorsal coloration (in alcohol) pale yellow to beige (in life, red-orange) in specimens 380– 516 mm SVL. Mitochondrial DNA sequence differences between Guiana Shield samples (C. caninus) and those from Amazonia (C. batesii) ranged from 3.1–16.2% (Vidal et al., 2005). [from HENDERSON eta l. 2009]. 
CommentHybridization: KIVIT & WISEMAN (2005) report a hybrid between C. caninus and C. hortulanus.

Habitat: fully arboreal (Harrington et al. 2018). 
EtymologyNamed after Latin caninus (also canina, caninum), meaning mean or snarling (as a dog face). Might be referring to the front view of the face of the species (M. Saliman, pers. comm., 23 May 2023) 
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