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The Early Jurassic Palaeospinacid sharks of Lyme Regis, southern England
Duffin, C.J.; Ward, D.J. (1993). The Early Jurassic Palaeospinacid sharks of Lyme Regis, southern England, in: Herman, J.S. et al. Elasmobranches et stratigraphie. Professional Paper. Geological Survey of Belgium, 1993/06(264)
In: Herman, J.S.; Van Waes, H (1993). Elasmobranches et stratigraphie. Professional Paper. Geological Survey of Belgium, 1993/06(264). Geologische Dienst van België: Brussel. 260 pp., 55 figs., 42 p pp., more
In: Professional Paper. Geological Survey of Belgium. Belgische Geologische Dienst: Brussel. ISSN 0378-0902, more
Peer reviewed article  

Available in  Authors 
Document type: Scientific report

Keywords
    Jurassic, Lower; Chondrichthyes; British Isles, England [Marine Regions]; Marine
Author keywords
    Chondrichthyes, Palaeospinacidae, Lower Jurassic, England

Authors  Top 
  • Duffin, C.J.
  • Ward, D.J.

Abstract
    The palaeospinacid shark material from the Sinemurian (Early Jurassic) of Lyme Regis, (Dorset, England), is reviewed in detail and two new species described; Synechodus enniskilleni sp. nov. and Synechodus occultidens sp. nov. It is concluded that the name Palaeospinax priscus can only be applied to a single specimen on which no characters of taxonomic value can be discerned and is thus a nomen dubium. Palaeospinax cannot therefore be applied to other Early Jurassic specimens previously assigned to the genus. Species previously referred to as Palaeospinax are referred to Synechodus. The differences between the two valid palaeospinacid genera, Synechodus and Paraorthacodus are discussed and nominal species listed. From a review of the relationships of Synechodus, it is concluded that the palaeospinacids plus the orthacodontids (forming the Synechodontiformes ord. nov.) are the sister-group of the hexanchids.

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