Caelopygus C.L. Koch, 1839 is a genus in the family Gonyleptidae, subfamily Caelopyginae with 2 species from Rio de Janeiro, Brazil.


  • Heterarthrodes Mello-Leitão, 1935c:405[2] [junior subjective synonym of Arthrodes Koch, 1839 by Soares & Soares (1948b); junior subjective synonym of Caelopygus Koch, 1839 by Soares & Soares (1986)[3]; type species: Heterarthrodes alvimi Mello-Leitão, 1935e, by original designation].
  • Liarthrodes Mello-Leitão, 1922:346[4] [junior subjective synonym of Caelopygus Koch, 1839 by Soares & Soares (1986)[3]; type species: Liarthrodes tetramaculatus Mello-Leitão, 1922, by original designation].


Caelopygus from Greek κοιλος (hollow) + πυγή (buttocks), referring to the concave dorsal outline of free tergites. Gender masculine. Because of this etymology Erichson (1845) corrected the Latinization to coelo- instead of caelo-, as an unjustified emendation.


Caelopygus originally not included in any subfamily of Gonyleptidae. Placed in Caelopyginae by Sørensen (1884b). Liarthrodes and Heterarthrodes originally in Caelopyginae.



  1. 1.0 1.1 Koch, C.L. (1839c) Übersicht des Arachnidensystems. Zweites Heft. C.H. Zeh, Nürnberg, 38 pp.
  2. Mello-Leitão, C.F. de (1935c) A propósito de alguns opiliões novos. Memórias do Instituto Butantan, São Paulo, 9, 369–411.
  3. 3.0 3.1 Soares, H.E.M. & Soares, B.A.M. (1986) Opera Opiliologica Varia XXVI. (Opiliones, Gonyleptidae). Revista Brasileira de Entomologia, São Paulo, 30(1), 87–100.
  4. Mello-Leitão, C.F. de (1922) Some new Brazilian Gonyleptidae. Annals and Magazine of Natural History, (9) 9, 329–348.
  5. Perty, J.A.M. (1833) Delectus animalium articulatorum, quae in itinere per Brasiliam annis MDCCCXVII-MDCCCXX [1817–1820] jussu et auspiciis Maximiliani Josephi I Bavariae Regis augustissimi peracto, collegerunt Dr. J. B. de Spix et Dr. C. F. Ph. de Martius. Vol. 3. [Opiliones, pp 201-209]. [“1830-1834”]. Friedrich Fleischer, Monachii [= München], 224 pp., pl. 25–40.

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