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Pseudorabdion eiselti INGER & LEVITON, 1961

IUCN Red List - Pseudorabdion eiselti - Least Concern, LC

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Higher TaxaColubridae, Calamariinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common Names 
SynonymPseudorabdion eiselti INGER & LEVITON 1961
Pseudorabdion eiselti — MANTHEY & GROSSMANN 1997: 382
Pseudorabdion eiselti — BROWN, LEVITON & SISON 1999
Pseudorabdion eiselti — DORIA & PETRI 2010
Pseudorabdion eiselti — WALLACH et al. 2014: 606 
DistributionIndonesia (Sumatra, Mentawai )

Type locality: Padang, Sumatra.  
Reproductionoviparous 
TypesHolotype: NMW (Naturhistorisches Museum Wien) 16806; other specimens: MSNG 
DiagnosisDiagnosis. No preocular or loreal shields; postocular and supraocular shields not fused together or to the ocular shield; frontal separated from eye by supraocular; nasal small, undivided; internasal touches first two supralabials (from INGER & LEVITON 1961).

Characters (MSNG 55465, 55466 both female): “rostral, as high as wide, touches first supralabial, nasal and internasal; each nasal touches rostral, internasal and first supralabial; each internasal touches rostral, nasal, praefrontal, first and second supralabials; prefrontal, as large as long, touches supraocular, frontal, internasal, eye, second and third supralabial; frontal hexagonal touches prefrontals, supraoculars and parietals; each parietal touches frontal, supra-ocular, postocular, paraparietal and fifth supralabial; mental touches anterior chin shields and first infralabial; anterior chin shields are united and posterior are divided.
Dorsal scales smooth and rhomboidal; first row lightly larger; scales become narrower in central dorsal. Although the number of ventral scales of these specimens (145) is greater than that of the holotype (130), the number of subcaudal scales is identical (12).” (Doria & Petri 2010).

Colour in alcohol: MSNG 55465 brown with two lighter spots at side of the neck; MSNG 55466 uniform brown with slightly lighter chin shields (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.

Comparisons: “In head scutellation, eiselti resembles three Philip pine species: ater (Taylor), oxycephalum (Giinther), and montanum Leviton and Brown. It differs from all three in having distinct su praocular and postocular shields, the internasal meeting the first supralabials behind the nasal (indicating the shortness of the nasal shield), and a proportionally larger eye. The proportion of eye di ameter to eye-mouth distance shown by Leviton and Brown (1959; fig. 5) for Pseudorabdion montanum is incorrect. The eye is much too large, compared to the vertical length of the adjacent supra labials, and should be reduced by one-third. The eye diameter /eye mouth distance ratio is correctly portrayed for P. oxycephalum (fig. 4, op. cit.), which P. montanum most closely resembles. The eye diameter/eye-mouth distance ratio in eiselti is similar to that in P. longiceps (fig. 1, op. cit.).
Pseudorabdion ater differs further from P. eiselti in having the frontal bordering the eye and the nasal divided. Pseudorabdion oxycephalum and P. montanum have higher ventral and subcaudal counts than eiselti. The counts for females of these species are: oxycephalum 144-157 and 16-17; montanum 154-161 and 21-22; eiselti 130 and 12. Data for the Philippine species are from Leviton and Brown (1959).
The only known species that may be sympatric with eiselti is P. longiceps (Cantor), which has been recorded from the west coast of Sumatra at Ayer Bangis (de Rooij, 1917), about 170 km. from the type locality of eiselti. It differs from eiselti in the presence of a pre ocular, the separation of the internasals from the labials, and higher subcaudal counts (females 17-20). Both longiceps and eiselti have larger eyes and more maxillary teeth than their Philippine congeners that also lack loreal shields.
All other species of Pseudorabdion differ from eiselti at least in the presence of loreals and in having the prefrontals and internasals separated from the labials (a direct consequence of having distinct loreals). One, albonuchalis (Günther), has the frontal bordering the eye. Two, saravacensis (Shelford) and sarasinorum (Müller), have more maxillary teeth (18-21 and 14 respectively) than eiselti (10). And at least two, taylori Leviton and Brown and mcnamarae Taylor, have higher subcaudal counts (females 33-35 and 20-23, respectively). The counts are from Leviton and Brown (1959)” (Inger & Leviton 1961). 
Comment 
Etymologynamed after Josef Eiselt (3 May 1912 – 25 July 2001), Austrian herpetologist. 
References
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Brown, Rafe M.; Leviton,A.E. & Sison,R.V. 1999. Description of a new species of Pseudorabdion (Serpentes: Colubridae) from Panay Island, Philippines with a revised key to the genus. Asiatic Herpetological Research 8: 07-12 - get paper here
  • David,P. & Vogel, G. 1996. The snakes of Sumatra. An annotated checklist and key with natural history notes. Bücher Kreth, Frankfurt/M.
  • 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
  • Gemel, R.; G. Gassner & S. Schweiger 2019. Katalog der Typen der Herpetologischen Sammlung des Naturhistorischen Museums Wien – 2018. Ann. Naturhist. Mus. Wien, B 121: 33–248
  • Inger, R.F. & A. E. LEVITON 1961. A new colubrid snake of the genus Pseudorabdion from Sumatra. Fieldiana Zoology 44 (5): 45-47 - get paper here
  • Manthey, U. & Grossmann, W. 1997. Amphibien & Reptilien Südostasiens. Natur und Tier Verlag (Münster), 512 pp. - get paper here
  • TEYNIÉ, ALEXANDRE; PATRICK DAVID, & ANNEMARIE OHLER 2010. Note on a collection of Amphibians and Reptiles from Western Sumatra (Indonesia), with the description of a new species of the genus Bufo. Zootaxa 2416: 1–43 - get paper here
  • Tiedemann, F.; H. Grill itsch, A. Cabela, R. Gemel 2002. Obituary: Dr. Josef Eiselt, 3 May 1912 – 25 July 2001. Amphibia-Reptilia 23 (1): 125-128 - get paper here
  • 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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