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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)
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]  
TypesHolotype: RMNH RENA 4626 (fide E. Dondorp, pers. comm. 28 Jan 2019), collected from the Moso River. 
DiagnosisDescription: Head as in the preceding species; first pair of chin-shields much longer than the postmental, followed on each side by four shields, much smaller than the first. Body more slender than in Tr. novae-guineae, with 10-13 transverse rows of spinose shields. Gular and ventral scales with a low keel. Spines of the tail very low, pointing backwards. Hind limb reaching the axilla. Rest like novaeguineae (de Rooij 1915: 281).

Coloration: Dark brown above; lower parts yellowish; the orbit bordered inferiorly by a red half-ring (de Rooij 1915: 281).

Size: Length of head and body 93 mm.; tail 91 mm (de Rooij 1915: 281). 
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. 
EtymologyNamed after Latin “gracilis”, meaning small or lanky, or gracile. 
  • 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
  • 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 relatio Molecular Phylogenetics and Evolution 27: 384–397 - 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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