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Celestus adercus SAVAGE, LIPS & IBÁÑEZ, 2008

IUCN Red List - Celestus adercus - Data Deficient, DD

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Higher TaxaDiploglossidae, Diploglossa, Anguimorpha, Sauria, Squamata (lizards) 
Subspecies 
Common Names 
SynonymCelestus adercus SAVAGE, LIPS & IBÁÑEZ 2008 
DistributionWC Panama

Type locality: abandoned sawmill site on the continental divide, 9.7 km NNW of El Copé, Parque Nacional General de División Omar Torrijos Herrera, La Pintada District, Coclé Province, Panama, ca. 850 m elevation (8°40’04” N, 80°35’6” W)  
Reproduction 
TypesHolotype: MVUP 1894, Museo de Vertebrados de la Universidad de Panamá, (formerly from Círculo Herpetológico de Panamá, CH 4870), collected by Tony Ranvestal and Dana Drake in July 2000. 
DiagnosisDiagnosis: a moderate-sized Celestus, 146 mm in total length, differing from C. cyanochloris of Costa Rica and C. enneagrammus, C. ingridae and C. legnotus of northern Mesoamerica in having the postocular series of scales juxtaposed to the suboculars (a single continuous series of postoculars and suboculars in the four listed forms). Among other species having the postoculars juxtaposed, the new species resembles C. rozellae of southern Mexico and upper Central America and C. hylaius and C. orobius from Costa Rica. C. adercus differs from C. rozellae most obviously in having a median keel on the caudal and subcaudal scales and 79 transverse rows of dorsal scales versus scales on tail without a median keel and 71-76 transverse rows of dorsal scales in C. rozellae. Celestus adercus is readily distinguished from C. hylaius of Atlantic versant Costa Rica because the latter has smooth caudal scales and weak keels on the subcaudal scales that are present only on the posterior third of the tail versus caudal scales keeled on all but the base of the tail, and subcaudal scales strongly keeled throughout the length of the tail in the new species. Celestus orobius of upland southern Costa Rica has 66 transverse rows of dorsal scales and one or two loreals (79 transverse rows of dorsal scales and three loreals in C. adercus). The new form differs from species of Celestus that occur in the West Indies by having juxtaposed postoculars and suboculars and three loreals rather than having the postoculars and suboculars in a continuous series and only two loreals. The accompanying dichotomous key and Table 3 provide additional features that differentiate the new form from other mainland congeners. 
CommentKnown only from the area of the type locality (Lotzkat et al. 2016).

Abundance: only known from the type specimen (Meiri et al. 2017). 
Etymologythe species names is derived from the Greek aderkes meaning unseen, invisible or unexpected in reference to the surprise discovery of this form in Panama as the southernmost mainland known member of the genus. 
References
  • Lotzkat, Sebastian, Andreas Hertz and Gunther Köhler 2016. A new species of Celestus (Squamata: Anguidae) from western Panama. Mesoamerican Herpetology 3(4): 962–975 - get paper here
  • Meiri, Shai; Aaron M. Bauer, Allen Allison, Fernando Castro-Herrera, Laurent Chirio, Guarino Colli, Indraneil Das, Tiffany M. Doan, Frank Glaw, Lee L. Grismer, Marinus Hoogmoed, Fred Kraus, Matthew LeBreton, Danny Meirte, Zoltán T. Nagy, Cristiano d 2017. Extinct, obscure or imaginary: the lizard species with the smallest ranges. Diversity and Distributions - get paper here
  • Savage, JM; Lips, KR; Ibáñez RD 2008. A new species of Celestus from west-central Panama, with consideration of the status of the genera of the Anguidae: Diploglossinae (Squamata). Revista de Biologia Tropical 56 (2): 845-859 - get paper here
 
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