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Pseudorabdion sirambense DORIA & PETRI, 2010

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Higher TaxaColubridae, Calamariinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Sirambé dwarf reed snake 
SynonymPseudorabdion sirambense DORIA & PETRI 2010
Pseudorabdion sirambense — WALLACH et al. 2014: 608 
DistributionIndonesia (Sumatra)

Type locality: Indonesia, Sumatra Island, Province of Sumatera Utara, “Si Rambé” (now Sirambi, about 13 km SE of Balige, off the southern shore of Danau Toba).  
TypesHolotype: MSNG 55463 male; leg. E. Modigliani, 1890; ex MSNG 30372. 
DiagnosisDescription (holotype). Total length mm 98; tail length mm 11; head length (tip of snout to angle of jaws) mm 4.3; head width mm 3.3; diameter of eye mm 0.5.
Rostral wider than high, in contact with internasal, nasal and first supralabial; internasals small and triangular, in contact with first and second supralabial (for half of their length), nasal, rostral and prefrontal; nasal undivided in contact with rostral, internasal and first supralabial; loreal, preocular and subocular absent; one supraocular and one postocular not fused; five supralabials higher than long, the fifth is the largest; third and fourth supralabials in contact with eye; five infralabials: first three in contact with anterior chin shields, third and fourth with posterior chin shields; paraparietals bordered by six shields; prefrontals large and irregular square shaped, in contact with internasal, eye, supraocular, frontal, second and third supralabial; frontal pentagonal as large as long, in contact with prefrontal, supraocular, parietal; parietal twice as long as frontal, in contact with frontal, postocular, supraocular, paraparietal, fifth supralabial; mental in contact with anterior chin shields and first infralabial; anterior chin shields closed, long and narrow; posterior chin shields shorter and closed for the first half; three gulars (Doria & Petri 2010).

Dentition: Nine (right) and eight (left) maxillary teeth.

Dorsal scales smooth and rhomboidal with posterior pit rounded; scales of central dorsal with the same dimensions of those near the ventrals. Dorsal scales in 15 rows at one head length behind head, 15 rows at midbody, 15 rows at one head length before vent. Ventral scales 112; subcaudal scales 21 paired; anal undivided.

Colour in alcohol: uniform dark brown; one yellowish spot at each side at fifth dorsal scale; one white spot on each parietal; one white spot on each paraparietal; white spot on third and fifth supralabial; mental region whitish; dorsal and caudal-dorsal scales with white centre; ventrals with first half dark brown and posterior half lighter (Doria & Petri 2010).

COMPARISONS: In head scutellation P. modiglianii n. sp. and P. sirambense n. sp. differ:
from P. albonuchale, mcnamarae, sarasinorum, saravacense, talonuran and taylori in not having the loreal scale and in having prefrontal in contact with supralabials;
from P. atrum and collare in having the supraocular scale;
from P. longiceps in not having preocular scale;
from a group with internasal in contact with second supralabial (P. atrum, montanum and oxycephalum) and from a group with internasal not in contact with any supralabial (P. albonuchale, longiceps, mcnamarae, sarasinorum, saravacense, talonuran and taylori) in having internasal in contact with first and second supralabials.
P. modiglianii n. sp. differs from P. eiselti and sirambense in having postocular and supraocular fused.
P. sirambense n. sp. differs from P. eiselti in having ventrals fewer than 120, subcaudal greater than 20 and for the ornamentation.
On the basis of the distribution and the scutellation we propose the “eiselti” complex constituted by P. eiselti, P. modiglianii and P. sirambense: these species are endemic in Sumatra and they have internasal in contact with first two supralabials as a typical character not present in other species of the genus (Doria & Petri 2010).

Comparisons: Doria & Petri 2010 compare the characters of 3 specimens of P. eiselti, 5 P. longiceps, 3 P. modiglianii and P. sirambense in their Table 3. 
CommentDoria & Petri 2010 did not provide any photos of this species. 
EtymologyThis species is named after the type locality “Si Rambé”. 
  • Doria, G. & Petri, M. 2010. PSEUDORABDION IN THE MUSEUM OF GENOVA WITH DESCRIPTION OF TWO NEW SPECIES FROM SUMATRA AND A REVISED KEY TO THE GENUS. Annali del Museo Civico di storia naturale “G. Doria” 102: 187-201
  • Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. [type catalogue] Taylor and Francis, CRC Press, 1237 pp.
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