You are here » home advanced search search results Amphisbaena ridleyi

Amphisbaena ridleyi BOULENGER, 1890

IUCN Red List - Amphisbaena ridleyi - Least Concern, LC

Can you confirm these amateur observations of Amphisbaena ridleyi?

Add your own observation of
Amphisbaena ridleyi »

Find more photos by Google images search: Google images

Higher TaxaAmphisbaenidae, Amphisbaenia, Lacertoidea, Squamata (lizards)
Common NamesE: Ridley's Worm Lizard
Portuguese: Cobra-de-Duas-Cabeças, Cobra-Cega 
SynonymAmphisbaena ridleyi BOULENGER 1890
Amphisbaena ridleyi — GANS 1963
Amphisbaena ridleyi — ESTES & WILLIAMS 1984
Amphisbaena ridleyi — MAUSFELD et al. 2002
Amphisbaena ridleyi — GANS 2005: 19
Amphisbaena ridleyi — GRABOSKI et al. 2022 
DistributionBrazil (Fernando de Noronha, a small volcanic archipelago in the equatorial South Atlantic (3°51’S and 32°25’W), 350 km off the northeastern Brazilian

Type locality: ‘‘Porto Bello’’ (= Brazil, according to G. Boulenger, 1890a) and ‘‘Fernando Noronha,’’ Brazil; restricted to ‘‘Fernando da Noronha, Brazil’’ (Gans, 1963: 103).  
TypesLectotype: BMNH Lectoparatypes: BMNH–; KM R-4443; MCZ 10789; MNHN = MHNP 90–419; SMF 11825; BMNH V.2.2a:RR-1960.1.4.39 (‘‘Porto Bello, W. Indies’’ 5 ‘‘Brazil’’), ZMUC 
DiagnosisOriginal description: Praemaxillary teeth 5 or 7, maxillaries 5-5, mandibulars 8-8. Snout obtusely pointed, slightly prominent. Tail thinner than the body, tapering. Rostral small, triangular; nasals forming a short suture a pair of very large præfrontals, followed by a pair of much smaller frontals; eye hardly distinguishable through the ocular ; a postocular, no subocular; three large upper labials, the second and third forming a suture with the ocular; lower border of second labial as long as or a little longer than that of the first, in contact with the second lower labial only mental quadrangular, followed by a large seven-sided chin-shield, which is much longer than broad broad; three lower labials, second very large. 180 to 196 annuli on the body and 18 to 20 on the tail the divisions of the annuli longer than broad, nearly equilateral on the middle of the belly, but nowhere broader than long ; 16 to 18 divisions above, and 20 to 24 below the lateral line. Anal shields SIX or eight. Prœanal pores four. Uniform brown or dark purplish brown above, pale brown inferiorly.” (Boulenger 1890).

Variation and comparisons: 16 specimens were collected by Mr. Ridley. One has 180 annuli on the body, one 181, one 182, three 183, two 185, two 186, one 187, one 188, oue 189, one 190, one 195, and one 196; two have 18 annuli on the tail, eleven 19, and three 20. The “Porto-Bello" specimen has 189 annuli on the belly, and 19 on the tail. The number of annuli in five specimens of A. caeca (including the type) recorded by Strauch are respectively 212 + 15, 215 + 13, 227 +18, 230 + 16, and 247+15. Duméril and Bibron give 226-329+18. A specimen from Porto Rico, which I owe to the kindness of Prof. Lütken, has 228+19. Considering that the number 247 + 15 given by Strauch is taken from a specimen in the Paris Museum, received from the Copenhagen Museum as from the island of St. Thomas, where only A. fenestrata (Cope) = antillensis, R. & L., is known to occur, as Prof. Lütken kindly informs me, it is clear to me that the specimen with 247 annuli belongs to A. fenestrata. The number of annuli would range, in A. caeca from 212 to 229, and in the present species from 180 to 196. According to Strauch, the length of the labial border of the first labial shield in A. caeca is about one half the length of that of the second; on Peters's figure of the type specimen, as well as in the Porto Rico specimen before me, it is about two thirds in A. Ridleyi both are equal, or the former is a little longer. The snout is longer and somewhat more prominent, the tail thicker and more obtuse in A. caca than in A. Ridleyi. The ventral segments of the two median rows are broader than long in the former species, the coloration of which is also different. (Boulenger 1890) 
CommentSimilar species: A. caeca; Boulenger himself as well as Gray considered the specimen in the British Museum to be A. caeca until Boulenger described it as new species, A. ridleyi. 
Etymologynamed afterthe collector of the types, Mr. Ridley. 
  • Almeida JPFA De, De Freitas MA, Da Silva MB, Valverde MCC, Rodrigues MT, Pires AM, Mott T. 2018. A new four-pored Amphisbaena (Squamata: Amphisbaenidae) from northeastern Brazil. Zootaxa 4514 (4): 553-562. doi: 10.11646/zootaxa.4514.4.8. - get paper here
  • 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. 1890. Reptilia. In Ridley, H. N., Notes on the zoology of Fernando Noronha. Jour. Linnean Soc. London 20: 481-482
  • Brygoo, E. R. 1990. Les types d'Amphisbaenidés, Pygopodidés, Xantusiidés (Reptiles, Sauriens) du Muséum national d'Histoire naturelle - Catalogue critique. Bull. Mus. Nat. Hist. Nat. 12 (ser. 4) A (3-4), suppl.: 3-18
  • Estes, Richard and Ernest E. Williams 1984. Ontogenetic Variation in the Molariform Teeth of Lizards. Journal of Vertebrate Paleontology 4 (1): 96-107 - get paper here
  • Falcione, Camila and Alejandra Hernando 2010. A new karyotypic formula for the genus Amphisbaena (Squamata: Amphisbaenidae). Phyllomedusa 9 (1): 75-80 - get paper here
  • Finley Jr., R.B. 1945. Notes on Lizards from Fernando Noronha. Copeia 1945 (3): 162-164 - get paper here
  • Gans, C. 1963. Notes on amphisbaenids (Amphisbaenia, Reptilia). 10. Redescription of Amphisbaena ridleyi Boulenger Copeia 1963 (1): 102-107. - get paper here
  • Gans, C. 2005. CHECKLIST AND BIBLIOGRAPHY OF THE AMPHISBAENIA OF THE WORLD. Bull. Am. Mus. Nat. Hist. 289: 1-130 - get paper here
  • Gans, Carl 1963. Redescription of Amphisbaena ridleyi Boulenger. Copeia 1963 (1): 102-107 - get paper here
  • Gonzalez R. C. et al. 2020. Lista dos Nomes Populares dos Répteis no Brasil – Primeira Versão. Herpetologia Brasileira 9 (2): 121 – 214 - get paper here
  • Graboski, R., Grazziotin, F.G., Mott, T., Trefaut Rodrigues, M., 2022. The phylogenetic position of Ridley's worm lizard reveals the complex biogeographic history of New World insular amphisbaenids. Molecular Phylogenetics and Evolution (2022),
  • Mausfeld, Patrick; Andreas SCHMITZ; Wolfgang BÖHME; Bernhard MISOF; Davor VRCIBRADIC; Carlos Frederico Duarte ROCHA 2002. Phylogenetic Affinities of Mabuya atlantica Schmidt, 1945, Endemic to the Atlantic Ocean Archipelago of Fernando de Noronha (Brazil): Necessity of Partitioning the Genus Mabuya Fitzinger, 1826 (Scincidae: Lygosominae). Zool. Anz. 241: 281–293 - get paper here
  • Vanzolini, P.E. 2002. AN AID TO THE IDENTIFICATION OF THE SOUTH AMERICAN SPECIES OF AMPHISBAENA (SQUAMATA, AMPHISBAENIDAE). Pap. Avul. Zool., Sao Paulo 42(15):351-362 - get paper here
External links  
Is it interesting? Share with others:

As link to this species use URL address:

without field 'search_param'. Field 'search_param' is used for browsing search result.

Please submit feedback about this entry to the curator