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Tribolonotus gracilis DE ROOIJ, 1909

IUCN Red List - Tribolonotus gracilis - Least Concern, LC
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Higher TaxaScincidae, Egerniinae (Tiliquini), Scincoidea, Sauria, Squamata (lizards)
Subspecies 
Common NamesG: Orangeaugen-Helmskink, (Rotaugen-) Buschkrokodil 
SynonymTribolonotus gracilis DE ROOIJ 1909: 381
Tribolonotus gracilis — DE ROOIJ 1915: 281
Tribolonotus gracilis — PARKER 1940: 267
Tribolonotus gracilis — MYS 1988: 148
Tribolonotus gracilis — MIRALLES 2004 
DistributionPapua New Guinea, Admirality Islands (Manus; may be in error fide MYS 1988: 148)

Type locality: “Beim Fluss Moso” [= near the river Moso]  
Reproductionoviparous 
TypesHolotype: RMNH RENA 4626 (fide E. Dondorp, pers. comm. 28 Jan 2019), collected from the Moso River. 
DiagnosisUnfortunately 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 665 characters), are available for collaborators and contributors. Please contact us for details. 
CommentSynonymy: Zweifel 1966 and Cogger 1972 expressed the opinion that Tribolonotus gracilis might be synonymous with Tribolonotus novaeguineae (for a discussion see MYS 1988: 148).

Behavior: one of only a few scincid lizards that can vocalize.

Reference images: see Uetz et al. 2024 for high-resolution reference images for this species. 
EtymologyNamed after Latin “gracilis”, meaning small or lanky, or gracile. 
References
  • Austin, Christopher C.; Eric N. Rittmeyer, Stephen J. Richards, George R. Zug 2010. Phylogeny, historical biogeography and body size evolution in Pacific Island Crocodile skinks Tribolonotus (Squamata; Scincidae). Molecular Phylogenetics and Evolution 57 (1): 227-236 - get paper here
  • Brecko, Jonathan, and Olivier SG Pauwels 2024. Biofluorescence of the Crocodile Skinks, genus Tribolonotus: first report in Scincidae. Herpetology Notes 17: 411-418
  • Charlier, Patric 1999. Haltung und Nachzucht des Neuguinea "Buschkrokodils" Tribolonotus gracilis. Elaphe 7 (3): 23-24
  • Cogger,H.G. 1972. A new scincid lizard of the genus Tribolonotus from Manus Island, New Guinea. Zoologische Mededelingen 47: 202-210 - get paper here
  • de Rooij, N. de 1909. Reptilien (Eidechsen, Schildkröten und Krokodile). Nova Guinea 5: 375-383 - get paper here
  • de Rooij, N. de 1915. The Reptiles of the Indo-Australian Archipelago. I. Lacertilia, Chelonia, Emydosauria. Leiden (E. J. Brill), xiv + 384 pp. - get paper here
  • de Rooij, N. de 1919. Reptiles (Lacertilia, Chelonia, Emydosauria). Nova Guinea 13: 133-153 [1915-1919] - get paper here
  • Dost, U. 2001. Das Rotaugen-Buschkrokodil, Tribolonotus gracilis. VDA-Aktuell 2/2001: 51-56
  • Esterbauer, H. 2018. Pflege und Nachzucht des Rotaugen-Buschkrokodils, Tribolonotus gracilis. Reptilia 23 (133): 44-50 - get paper here
  • Evers, M. 2006. Das Buschkrokodil. Reptilia (Münster) 11 (58): 55-60 - get paper here
  • Evers, Michael 2010. Der Orangeaugen-Helmskink Tribolonotus gracilis. Natur und Tier Verlag, 64 pp. - get paper here
  • Iskandar, Djoko T. and Walter R. Erdelen 2006. Conservation of amphibians and reptiles in Indonesia: issues and problems. Amphibian & Reptile Conservation 4 (1): 60-87 - get paper here
  • Janssen, J. & Shepherd, C. R. 2018. Challenges in documenting trade in non CITES-listed species: A case study on crocodile skinks (Tribolonotus spp.). J. Asia-Pacific Biodivers. 11, 476–481 (2018) - get paper here
  • Kinghorn,J.R. 1937. A new species of skink from the Solomon Islands. Rec. Austral. Mus. 20 (1): 1-2 - get paper here
  • Meyer, J. 2002. Einige Bemerkungen zur Haltung und Nachzucht von Helmskinken der Art Tribolonotus gracilis (DE ROOIJ 1909). Herpetofauna 24 (139): 28-34 - get paper here
  • MEYER, Jochen 2012. Erste Erfahrungen mit dem Neuguinea-Helmskink, Tribolonotus novaeguineae. Terraria-Elaphe 2012 (6): 78-86 - get paper here
  • Miralles, Aurelien 2004. Biologie, ecologie en verzorging van de Krokodilskink van Nieuw-Guinea, Tribolonotus gracilis. Lacerta 62 (4): 166-173 - get paper here
  • Mys, Benoit 1988. The zoogeography of the scincid lizards from North Papua New Guinea (Reptilia: Scincidae). I. The distribution of the species. Bull. Inst. Roy. Sci. Nat. Belgique (Biologie) 58: 127-183
  • Parker, H. W. 1940. Undescribed anatomical structures and new species of reptiles and amphibians. Ann. Mag. nat. Hist. (11) 5: 257-274 - get paper here
  • Peters, U. 1970. Tribolonotus gracilis im Terrarium. DATZ 23 (1): 29-30
  • Reeder, T.W. 2003. A phylogeny of the Australian Sphenomorphus group (Scincidae: Squamata) and the phylogenetic placement of the crocodile skinks (Tribolonotus): Bayesian approaches to assessing congruence and obtaining confidence in maximum likelihood inferred relationships. Molecular Phylogenetics and Evolution 27: 384–397 - get paper here
  • Uetz, P.H.; Patel, M.; Gbadamosi, Z.; Nguyen, A.; Shoope, S. 2024. A Reference Database of Reptile Images. Taxonomy 4: 723–732 - get paper here
  • Zweifel, Richard G. 1966. A New Lizard of the Genus Tribolonotus (Scincidae) from New Britain. American Museum Novitates 2264: 1-12. - get paper here
 
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