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Calamaria berezowskii GÜNTHER, 1896

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Higher TaxaColubridae, Calamariinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Berezowski’s Reed Snake
Chinese: 川西两头蛇 
SynonymCalamaria berezowskii GÜNTHER 1896: 205
Calamaria berezowskii — STEJNEGER 1907: 376
Caramaria berezowskii [sic] — OSHIMA 1910: 200
Calamaria pavimentata — ZHAO et al. 1998
Calamaria pavimentata — ZHAO 2006
Calamaria pavimentata — ZHAO 2003
Calamaria berezowskii — LIANG et al. 2024 
DistributionChina (Sichuan)

Type locality: Lun-ngan-fu (龙安府 Long’an Fu, now 龙安镇 Long’an Town of 平武县 Pingwu County) of Sze-chuen (Sichuan Province of China)  
Reproductionoviparous 
TypesLectotype: ZISP 8823, adult male 
DiagnosisDiagnosis. Calamaria berezowskii can be distinguished from all other congeneric species by having the following combination of morphological characters: 1) rostral shield width larger than high; 2) prefrontal shorter than frontal, touching the first and second supralabials; 3) frontal hexagonal, length longer than width; 4) mental not touching anterior chin shields; 5) two pairs of chinshields, the anterior not much longer than the posterior, less than 1/2 of the posterior chin shield meets in the midline; 6) eye diameter less than eye-mouth distance; 7) single preocular, single postocular; 8) four supralabials, second and third supralabials entering orbit; 9) five infralabials, first three touching anterior chin shields, first pair of supralabials touching each other; 10) six scales and shields surrounding the paraparietals; 11) dorsal scales smooth, DSR 13–13–13 (n = 4); 12) dorsal scales reduced to six rows above last subcaudal at tail; 13) 149 (+2 preventrals)–155 ventrals in the males (n = 2), 153– 165 (+2 preventrals) in the females (n = 2); 14) 22–25 subcaudals in the males (n = 2), 16 in the females (n = 2), all paired; 15) anal plate single and intact; 16) dorsum of body and tail blackish-brown or brown, with a faint dark line along each side of the back; 17) a more or less distinct yellowish collar; 18) 2–3 pairs of small white spots may be present or absent on the tail; 19) ventral scales of body light khaki or white, with a dark longitudinal line or scattered spots on the underside of tail; 20) two outermost dorsal scale rows light khaki with upper margins partly dark pigmented; 21) tail relatively short (5.6–10.5% of the total length), not flattened, slowly tapering to obtuse, with a conical end. (Liang et al. 2024)


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CommentSynonymy: Calamaria berezowskii has been considered as a synonym of pavimentata and populations from Sichuan have been called pavimentata by Zhao as given in the chresonymy.

Conservation: C. p. miyarai is classified as “vulnerable” in Japan (Ota 2000).

Distribution: not on Java (Indonesia) fide de Lang 2017; the original type locality (Java, Indonesia) is in error. 
EtymologyNamed after Russian traveler and zoologist. Michael Berezowski. 
References
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