Tropidonophis aenigmaticus MALNATE & UNDERWOOD, 1988

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Higher Taxa	Colubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies
Common Names	E: East Papuan keelback
Synonym	Tropidonophis aenigmaticus MALNATE & UNDERWOOD 1988: 120 Styporhynchus multiscutellatus MCDOWELL 1984: 19 (part.) Tropidonophis aenigmaticus — WALLACH et al. 2014: 749 Tropidonophis aenigmaticus — ROBERTS et al. 2024
Distribution	Fergusson Island (Papua New Guinea) Type locality: between Agamoia and Ailuluai, Fergusson Island, d’Entrecasteaux Islands, Milne Bay District, Papua New Guinea
Reproduction	oviparous
Types	Holotype: AMNH 76633, male
Diagnosis	Diagnosis: Tropidonophis aenigmaticus may be distinguished from montanus, parkeri and statisticus by low ventral and subcaudal counts (and a notably lower mean v+sc value) and shorter >8 and eight caudal scale row lengths (see Tables 22 and 3). It is further differentiated from montanus by having nine infralabials and fewer subcaudal pits; further from parkeri by a shorter tail (mean 25% of total length, 28% in parkeri), fewer subcaudal pits, and by usually having contact between the upper postocular and anterior temporals; further from statisticus by the presence of two anterior temporals and a much higher frequency of contact between the upper postocular and anterior temporals. Ventral counts of enigmaticus are similar to those of doriae, m. mairii, m. brongersmai and multiscutellatus. Tropidonophis doriae has 17 dorsal scale rows; the two subspecies of mairii have a single preocular. From multiscutellatus the species is distinguished by a shorter tail (30% in multiscutellatus) and fewer subcaudals. (Malnate & Underwood 1988: 169) Unfortunately we had to temporarily remove additional information as this was scraped by multiple AI companies who sell that data to their customers. These details, e.g. detailed descriptions or comparisons (about 8446 characters) are available for collaborators and contributors. Please contact us for details.
Comment	Distribution: see map in MALNATE & UNDERWOOD 1988: 163 (Fig. 29).
References	Malnate E V; Underwood G 1988. Australasian natricine snakes of the genus Tropidonophis. PROCEEDINGS OF THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA 140 (1) : 59-201 - get paper here McDowell, S B 1984. Results of the Archbold Expeditions. No. 112. The snakes of the Huon Peninsula, Papua New Guinea. American Museum Novitates (2775): 1-28 - get paper here O’Shea,M. 1996. A Guide to the Snakes of Papua New Guinea. Independent Publishing, Port Moresby, xii + 239 pp. - get paper here Roberts, J. R., Kraus, F., Allison, A., Richards, S. J., Iova, B., Tjaturadi, B., ... & Austin, C. C. 2024. Systematics and biogeo graphy of a Sunda-Papuan snake lineage (Natricidae: Tropidonophis Jan 1863). Zoological Journal of the Linnean Society, zlae039 - 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.
External links	IUCN Red List National Center for Biotechnology Information http://3.bp.blogspot.com/-2xG8qsG5-qc/TuJLvhwIe4I/AAAAAAAAWOc/OD3CgP6yGKo… Google images

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