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A fossil Chimaeroid from the Gronsveld Member (Late Maastrichtian , Late Cretaceous)of northeast Belgium
Duffin, C.J.; Reynders, J.P.H. (1994). A fossil Chimaeroid from the Gronsveld Member (Late Maastrichtian , Late Cretaceous)of northeast Belgium, in: Herman, J.S. et al. (1995). Elasmobranches et stratigraphie, volume 1994. Professional Paper. Geological Survey of Belgium, 1995/03(278): pp. 111-156
In: Herman, J.S.; Van Waes, H (1995). Elasmobranches et stratigraphie, volume 1994. Professional Paper. Geological Survey of Belgium, 1995/03(278). Geologische Dienst van België: Brussel. 283 pp., 48 figs., 74 pl. pp., more
In: Professional Paper. Geological Survey of Belgium. Koninklijk Belgisch Instituut voor Natuurwetenschappen. Belgische Geologische Dienst: Bruxelles. ISSN 0378-0902, more
Peer reviewed article  

Available in Authors 
Document type: Scientific report

Keywords
    Cretaceous; Holocene; Chimaeridae Rafinesque, 1815 [WoRMS]; Chondrichthyes; Holocephali [WoRMS]; Marine
Author keywords
    frontal clasper denticles, tooth plates

Authors  Top 
  • Duffin, C.J.
  • Reynders, J.P.H.

Abstract
    The associated fragments of a single male individual of a large chimaeroid fish are described from the Gronsveld Member (LateMaastrichtian, LateCretaceous) of Romontbos Quarry in northeast Belgium. The material includes a complete dorsal fin spine, tooth plate fragments and frontal clasper denticles. The arrangement of the tritors on the tooth plates indicates that the specimen belongs to Edaphodon sp., having closest similarity with E.agassizi and E.ubaghsi. Chimaeroid frontal clasper denticles are figured and described in detail for the first time, with the development of an appropriate terminology. Clasper denticles are arranged in a closely fitting revetment of longitudinal and diagonal rows, with a consistent pattern of base overlap. Edaphodon clasper denticles differ from those of extant chimaeroids in various features of the base. Clasper denticle morphology is a potentially useful taxonomic tool at the suprafamilial level. Attachment of posterolateral denticles to the dorsal fin spine was secondary, and proceeded in an apical direction. Anterior dorsal fin spine denticles are primary features of spine development in Edaphodon. Bloodvessel tracery is described from the lateral walls of the spine. Dorsal fin spine morphology appears to be taxonomically useful at the generic level.

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