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Temporal range: Ordovician
Cnemidopyge nuda CRF.jpg
Cnemidopyge nuda, 26mm, from Llandrindod Wells, Wales
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Trilobita
Order: Asaphida
Suborder: Trinucleina
Family: Raphiophoridae
Subfamily: Raphiophorinae
Genus: Cnemidopyge
Whittard, 1955
  • C. nuda (Muchison, 1839) (type) synonyms Trinucleus nudus, Ampyx nudus, A. latus

Cnemidopyge is a genus of trilobites that lived during the Ordovician. Like all Raphiophorids it is blind, with a headshield (or cephalon) that is subtriangular to subsemicircular, carrying genal spines and a forward directed rapier-like spine on the central raised area (or glabella), with the front of the glabella inflated and the natural fracture lines (or sutures) of the cephalon coinciding with its margin. It may be easily distinguished from other raphiophorids by the rectangular thorax with 6 segments, where other genera have a different number of segments and segments change in width over the length of the thorax.[1] Uniquely in this genus, the inner pleural region of the frontal segment is enlarged.[2] Also the axis (or rhachis) and pleural fields of the pygidium are strongly segmented.[1]


  1. ^ a b Hughes, C.P. (1969). The Ordovician Trilobite Faunas of the Builth-Llandrindod Inlier Central Wales [Part 1]. Bulletin of the British Museum (Natural History) Geology. 18. pp. 41–103. 
  2. ^ Whittington, H. B. et al. (1997) Treatise on Invertebrate Paleontology. Part O, Revised, Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida.