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Discoasteraceae

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Description

  • Citation: 
    FAMILY DISCOASTERACEAE TAN, 1927

    Description. Discoidal nannoliths of 3-40 elements radiating from a common centre. C-axes vertical, so nannoliths appear dark in plane-polarised light. Some early forms also include a cycle of birefringent units.

    Taxa included: Discoaster, Catinaster.

    variabilis.jpg

    Discoaster variabilis group

    6-rayed discoasters with bifurcations.

    brouweri.jpg Discoaster brouweri group

    6-rayed discoasters without bifurcations, and forms closely related to D. brouweri with 3 to 5 rays

    pentaradiatus.jpg

    Discoaster pentaradiatus group

    symmetric 5-rayed discoasters

    c._coalitus.jpg

    Catinaster

    6-rayed discosters in which the birfurcations meet to form a rim, which extends proximally

Images

  • Catinaster calyculus
  • D sanmiguelensis
  • musicus.jpg
  • loeblichii.jpg
  • bergenii.jpg
  • discoasters.jpg
Scratchpads developed and conceived by: Vince Smith, Simon Rycroft & Dave Roberts