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  • Palaeoxyris helicteroides Morris in Prestwich, 1840


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    oilshale
    • Palaeoxyris is now thought to be the shark egg morphotype of the family Hybodontoidae.

       

      Quote from Fischer & Kogan (2008):

      "Based on the size differentiation and frequency of two Palaeoxyris species and different hybodont shark remains
      from the Stephanian lacustrine Wettin strata of the Saale Basin, Germany, SCHNEIDER (1986) was able to assign
      both egg capsules to their putative producers (P. helicteroides to Lissodus lacustris and P. carbonaria to
      Limnoselache [Sphenacanthus SOLER-GIJÓN, 1997] vicinalis; this attribution was confirmed by GEBHARDT,
      1988) (Fig. 5), which occurred in the same strata but in different sedimentary facies. The capsules were mainly
      found in fluviatile-palustrine deposits, whereas skeletal remains were restricted to pelagic lacustrine sediments.
      So it seemed plausible that both hybodont shark species used the shore area of the lake for spawning."

       

      Lit.: Jan Fischer & Ilja Kogan (2008) Elasmobranch egg capsules Palaeoxyris, Fayolia and Vetacapsula as subject of palaeontological research – an annotated bibliography. Freiberger Forschungshefte, C 528, pp75-91

       

    Taxonomy

    Shark egg capsule

    Kingdom: Animalia
    Phylum: Chordata
    Class: Chondrichthyes
    Order: Hybodontiformes
    Family: Hybodontidae
    Genus: Palaeoxyris
    Species: P. helicteroides
    Author Citation MORRIS in PRESTWICH (1840)

    Geological Time Scale

    Eon: Phanerozoic
    Era: Paleozoic
    Period: Carboniferous
    Epoch: Late
    International Age: Langsettian

    Stratigraphy

    Pennine Coal Measures Group
    Pennine Middle Coal Measures Formation

    Biostratigraphy

    communis Zone
    10 foot ironstone measures

    Provenance

    Collector: T. Bastelberger
    Date Collected: 06/01/1975
    Acquired by: Field Collection

    Location

    Coseley, Clay Croft open-cast works
    Staffordshire
    West Midlands
    United Kingdom

    Comments

    Palaeoxyris is now thought to be the shark egg morphotype of the family Hybodontoidae.

     

    Quote from Fischer & Kogan (2008):

    "Based on the size differentiation and frequency of two Palaeoxyris species and different hybodont shark remains
    from the Stephanian lacustrine Wettin strata of the Saale Basin, Germany, SCHNEIDER (1986) was able to assign
    both egg capsules to their putative producers (P. helicteroides to Lissodus lacustris and P. carbonaria to
    Limnoselache [Sphenacanthus SOLER-GIJÓN, 1997] vicinalis; this attribution was confirmed by GEBHARDT,
    1988) (Fig. 5), which occurred in the same strata but in different sedimentary facies. The capsules were mainly
    found in fluviatile-palustrine deposits, whereas skeletal remains were restricted to pelagic lacustrine sediments.
    So it seemed plausible that both hybodont shark species used the shore area of the lake for spawning."

     

    Lit.: Jan Fischer & Ilja Kogan (2008) Elasmobranch egg capsules Palaeoxyris, Fayolia and Vetacapsula as subject of palaeontological research – an annotated bibliography. Freiberger Forschungshefte, C 528, pp75-91

     



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