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Boaedon bedriagae BOULENGER, 1906

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Higher TaxaLamprophiidae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common Names 
SynonymBoodon bedriagae BOULENGER 1906: 211
Lamprophis lineatus bedriagae — DREWES 2002
Boaedon bedriagae — CERIACO et al. 2021 
DistributionSão Tomé Island

Type locality: Vista Alegre [0.318941°, 6.676295°, 336 m], Mé-Zochi district, São Tomé Island  
Reproductionoviparous. 
TypesLectotype: MSNG/CE 30987b, an adult, collected by Leonardo Fea on 1900. 
DiagnosisDiagnosis — Boaedon bedriagae (Figures 2 to 5) can be distinguished from all of its Central and West African congeners by the following combination of characters: dark brown colouration with parallel mediodorsal and lateral bands running from the neck to the tail; two broad, cream-coloured, dark brown-bordered bands running on the side of the head; the upper band starting on the nasals and extending above the eye to the posterior part of the head, the lower band usually starting on the posterior lower part of the eye and extending to the corner of the mouth; venter cream-coloured speckled with dark brown markings; the 3rd, 4th and 5th supralabials contacting the eye, one preocular; 25 to 31 midbody scales rows, 210 to 247 ventral scales and 65 to 95 subcaudals, and a maximum snout–vent length of 107 cm.
It can be distinguished from B. fuliginosus by its higher number of ventral and subcaudal scales (210 to 247 and 65 to 95, respectively, in B. bedriagae versus 194 to 229 and 46 to 71 in W-African B. fuliginosus fide Hallermann et al. (2020), by having three supralabials touching the eye (versus only two in B. fuliginosus fide Hallermann et al. 2020), by having two broad cream, dark-bordered bands running on the side of the head (versus two thin white lines in B. fuliginosus), and by having dark brown colouration with parallel mediodorsal and lateral bands running from the neck to the tail (versus a homogeneous dark brown colouration in B. fuliginosus); it can be distinguished from B. lineatus by dark brown colouration with parallel mediodorsal and lateral bands running from the neck to the tail (versus a uniformly grey to reddish brown colouration in B. lineatus) and by having only one preocular (versus usually two in B. lineatus); it can be distinguished from B. olivaceus, B. poensis and B. radfordi by having the subcaudals divided (versus single in B. olivaceus, B. poensis and B. radfordi); it can be distinguished from B. virgatus by having two broad cream, dark-bordered bands running on the side of the head (versus two thin white lines in B. virgatus), by a higher number of midbody scales rows (25 to 31 in B. bedriagae versus 23 to 25 in B. virgatus), and a higher number of ventral and subcaudal scales (210 to 247 and 65 to 95, respectively, in B. bedriagae versus 186 to 223 and 42 to 64 in B. virgatus); it can be distinguished from B. upembae by having more ventral scales (210 to 247 in B. bedriagae versus 175 to 197 in B. upembae), and a higher number of midbody scale rows (25 to 31 in B. bedriagae versus 21 to 23 in B. upembae). It can be distinguished from B. perisilvestris by the 3rd, 4th and 5th supralabial in contact with the eye (versus usually the 4th and 5th in B. perisilvestris), by having two broad cream, dark-bordered bands running on the side of the head (versus no lines in B. perisilvestris), and by having dark brown colouration with parallel mediodorsal and lateral bands running from the neck to the tail (versus a homogeneous dark brown colouration in B. perisilvestris); it can be distinguished from B. paralineatus by the 3rd, 4th and 5th supralabial in contact with the eye (versus only the 4th and 5th in B. paralineatus), by its lower number of midbody scale rows (25 to 31 in B. bedriagae versus 31 to 35 in B. paralineatus); it can be distinguished from B. subflavus by the 3rd, 4th and 5th supralabial in contact with the eye (versus only the 4th and 5th in B. subflavus); having two broad, cream-coloured and dark-bordered bands running on the side of the head (versus only one line in B. subflavus), and by having dark brown colouration with parallel mediodorsal and lateral bands running from the neck to the tail (versus a homogeneous yellow to light brown colouration in B. subflavus); it can be distinguished from B. longilineatus by having a higher number of subcaudals (65 to 95 versus 42 to 63 in B. longilineatus) and by having two broad coloured and dark-bordered bands running on the side of the head (versus only one, continuous from the snout to the tail, in B. longilineatus); it can be distinguished from B. littoralis by having dark brown colouration with parallel mediodorsal and lateral bands running from the neck to the tail (versus homogeneous light brown colouration in B. littoralis) (Ceriaco et al. 2021). 
CommentSimilar species: Boaedon lineatus (from which this species was resurrected by Ceriaco et al. 2021).

Synonymy: for a more detailed synonymy see Ceriaco et al. 2021. 
EtymologyNamed after Jacques von Bedriaga (1854-1906), Russian-born herpetologist. 
References
  • Boulenger, G.A. 1906. Report on the reptiles collected by the late L. Fea in West Africa. Ann. Mus. civ. Stor. Nat. Genova (3) 2: 196-216 - get paper here
  • Ceríaco, Luis MP; Ana Lisette Arellano , Robert C Jadin , Mariana P Marques , Diogo Parrinha & Jakob Hallermann 2021. Taxonomic revision of the Jita snakes (Lamprophiidae: Boaedon) from São Tomé and Príncipe (Gulf of Guinea), with the description of a new species. African Journal of Herpetology, - get paper here
 
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