Chironius flavolineatus JAN, 1863
Can you confirm these amateur observations of Chironius flavolineatus?
|Higher Taxa||Colubridae, Colubrinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)|
|Common Names||E: Boettger's Sipo|
|Synonym||Coluber flavolineatus REINWARDT in BOIE 1826 (nomen nudum)|
Herpetodryas carinatus var. flavolineata JAN 1863: 80
Herpetodryas flavolineatus BOETTGER 1885: 234
Herpetodryas carinatus var. flavolineata FITZINGER — JAN 1863
Herpetodryas carinatus (not of LINNAEUS) — BOULENGER 1894
Herpetodryas carinatus var. flavolineata — BOETTGER 1898: 55
Chironius flavolineatus — BAILEY 1955: 13
Chironius flavolineatus — PETERS & OREJAS-MIRANDA 1970: 60
Chironius flavolineatus — LEHR 2002: 204
Chironius flavolineatus — WALLACH et al. 2014: 160
Chironius flavolineatus — NOGUEIRA et al. 2019
|Distribution||Brazil (Alagoas, Bahia, NE Mato Grosso, Mato Grosso do Sul, Sao Paulo, Rio Grande do Sul, Ilha de Marajo, Para, Goias, Minas Gerais, Paraná [HR 27: 216], Amazonas, Amapá, S Ceará, Paraíba, Pernambuco, Rio Grande do Norte, Sergipe, Tocantins, Maranhão, Piauí),|
NE Paraguay, C Bolivia, Peru
Type locality: Brazil, no specific locality by original designation (Jan 1863)
|Types||Lectotype: MSNM 2729 (Milano), designated by HAMDAN et al. 2014|
|Diagnosis||Diagnosis: This is the only species of Chironius with a bright yellow vertebral stripe which is bordered anteriorly by black sides above the first scale row [DIXON et al. 1993: 105].|
Diagnosis. Chironius flavolineatus can be distinguished from all congeners by the following unique combination of states of character: first third of body black or dark gray; vertebral stripe yellowish or creamish white, distinct from dorsals of nape and extending throughout almost whole body length; head dorsum tan to brown, distinct from background color of first third of body; posterior temporal scale one; cloacal shield divided; maximum of two rows of keeled dorsal scales at midbody; ventral ground color completely creamish white or yellowish without ornamentation; dark longitudinal stripes (in “zigzag”) along midventral portion of subcaudals absent; hemipenis with no spinules separating calyces of apex from spines below region of constriction on asulcate side; sulcus spermaticus positioned on concave face of hemipenis in lateral view; ascending process of premaxilla perpendicular to longitudinal axis of skull; optic fenestra exceeding frontoparietal suture; posterior border of supratemporal not exceeding braincase; dorsoventral axis of quadrate straight, not moving away from longitudinal axis of skull [HAMDAN & FERNANDES 2015].
Comparisons. Chironius flavolineatus is distinguished from all currently recognized congeners, except C. diamantina, by having first third of body black or dark gray, vertebral stripe yellowish or creamish white, distinct from dorsals of nape and extending throughout almost whole body length, and head dorsum tan to brown distinct from background color of first third of body. Chironius flavolineatus differs from Chironius diamantina (character states in parentheses) by having posterior temporals frequently one (vs. two to four); cloacal shield divided (vs. entire); number of rows of keeled dorsal scales at midbody 0–4 (vs. 6–10 rows of keeled dorsal scales at midbody); ventral and subcaudal scales creamish white without pigmentation (vs. ventral scales with dark edges forming conspicuous transverse bars virtually throughout whole belly and conspicuous dark longitudinal stripes in “zigzag” at midventral suture of subcaudals) [HAMDAN & FERNANDES 2015].
Variation: C. flavolineatus shows no ontogenetic change in color pattern, although C. diamantina (Fernandes & Hamdan 2014) and C. brazili present such variation.
|Comment||Authorship: According to PETERS & OREJAS-MIRANDA (1970), Boettger (1885) described this species. However, HAMDAN et al. 2014 suggested that JAN is the correct author.|
Distribution: this species has been reported from Peru, but without specific locality (T. Doan, pers. comm. 30 Apr 2012). For more localities see HAMDAN et al. 2014, and map in HAMDAN & FERNANDES 2015 (Fig. 6).
Habitat: This species is found on in grass steppes (savanna), and in caatinga-agreste- savanna formations. Semi-arboreal (Harrington et al. 2018).
Sympatry: Chironius flavolineatus and C. brazili show some level of sympatry, but C. brazili generally occurs in altitudes from 700–900 m asl, while C. flavolineatus is more commonly found in altitudes from100–400 m asl. Chironius diamantina is apparently restricted to Caatinga biome (Fernandes & Hamdan 2014) and no sympatry with C. flavolineatus or C. brazili was observed [HAMDAN & FERNANDES 2015].
Similar species: Chironius brazili, and C. diamantina