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Pareas nuchalis (BOULENGER, 1900)

IUCN Red List - Pareas nuchalis - Least Concern, LC

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Higher TaxaPareidae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Barred slug-eating snake 
SynonymAmblycephalus nuchalis BOULENGER 1900: 185
Amblycephalus nuchalis — DE ROOIJ 1917: 277
Pareas nuchalis – MALKMUS 1996
Pareas nuchalis — MALKMUS et al. 2002
Pareas nuchalis — WALLACH et al. 2014: 537
Pareas (Pareas) nuchalis — POYARKOV et al. 2022: 62 
DistributionIndonesia (Borneo), Malaysia (Borneo, Sarawak)

Type locality: Matang, Kidi District, Sarawak.  
Reproductionoviparous 
TypesHolotype: SMK, a 490 mm specimen (A. Everett?), Sarawak Museum, Kuching, Sarawak, East Malaysia 
DiagnosisDiagnosis (n= 9): Pareas nuchalis differs from other members of the genus Pareas by the following combination of morphological characters: maximal total length up to 678 mm; anterior pair of chin shields longer than broad; loreal not contacting the eye; prefrontal in contact with the eye; 1–3 suboculars; 1–2 postoculars; temporals generally 3 + 4 or 3 + 3; one to three median vertebral scale rows slightly enlarged; 7–8 supralabial scales; generally 7 (rarely 6 or 8) infralabials; 15 dorsal scale rows at midbody, all totally smooth; 201–220 ventrals; 102–120 subcaudals, all divided; dorsum tan to light brown with weak dark-brown vertebral spots and 61–78 distinct transverse dark-brown bands (Figs. 16 and 17); upper postorbital stripes thick, black, bifurcating posterior to the secondary temporals, forming a vertical black bar to the mouth angle; upper postorbital stripes contacting each other on the nuchal area forming a large black ring-shaped blotch (Fig. 17); lower postorbital stripes thick, black, reaching the anterior part of SL6, often continuing to the lower jaw and chin; belly yellowish immaculate or with sparce brown dusting (Figs. 16 and 17); iris in life whitish with brownish speckles and veins getting denser around the pupil (Fig. 17) (Boulenger, 1900; Stuebing, Inger & Lardner, 2014; our data).


Additional details (1645 characters) are available for collaborators and contributors. Please contact us for details. 
CommentHabitat: partly arboreal (Harrington et al. 2018). 
EtymologyNamed after the Latin adjective in nominative singular meaning “nuchal” and was given in reference to the characteristic black ring-shaped spot in the nuchal area in this species. 
References
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Boulenger, G.A. 1900. Description of new reptiles and batrachians from Bomeo. Proc. Zool. Soc. London: 182-187. - get paper here
  • Das, I. 2012. A Naturalist's Guide to the Snakes of South-East Asia: Malaysia, Singapore, Thailand, Myanmar, Borneo, Sumatra, Java and Bali. Oxford J, ohn Beaufoy Publishing - get paper here
  • de Rooij, N. DE 1917. The Reptiles of the Indo-Australian Archipelago. Il. Ophidia. Leiden (E. J. Brill), xiv + 334 S. - get paper here
  • Guo, Keji & Deng, Xuejiang 2009. A new species of Pareas (Serpentes: Colubridae: Pareatinae) from the Gaoligong Mountains, southwestern China. Zootaxa 2008: 53-60 - get paper here
  • Harrington, Sean M; Jordyn M de Haan, Lindsey Shapiro, Sara Ruane 2018. Habits and characteristics of arboreal snakes worldwide: arboreality constrains body size but does not affect lineage diversification. Biological Journal of the Linnean Society 125 (1): 61–71 - get paper here
  • Malkmus, R. & Sauer, H. 1996. Ruhestellung von Pareas nuchalis und Erstnachweis dieser Art im Nationalpark Mount Kinabalu/Malaysia. Salamandra 32 (1): 55-58 - get paper here
  • Malkmus, R.; Manthey, U.; Vogel, G. Hoffmann, P. & Kosuch, J. 2002. Amphibians and reptiles of Mount Kinabalu (North Borneo). A.R.G. Ganther Verlag, Rugell, 404 pp.
  • Poyarkov NA, Nguyen TV, Pawangkhanant P, Yushchenko PV, Brakels P, Nguyen LH, Nguyen HN, Suwannapoom C, Orlov N, Vogel G. 2022. An integrative taxonomic revision of slug-eating snakes (Squamata: Pareidae: Pareineae) reveals unprecedented diversity in Indochina. PeerJ 10: e12713 - get paper here
  • Stuebing, R.B., Inger, R.F. & Lardner, B. 2014. A field guide to the snakes of Borneo, second edition. Natural history Publications (Borneo)
  • 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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