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    Efficient Ornamentation in Ordovician Anthaspidellid Sponges

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    Church 18.pdf (1.785Mb)
    Issue Date
    2017-08-09
    Author
    Church, Stephen B.
    Publisher
    Paleontological Institute
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Is part of series
    Paleontological Contributions;18
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    Abstract
    Lithistid orchoclad sponges within the family Anthaspidellidae Ulrich in Miller, 1889 include several genera that added ornate features to their outer-wall surfaces during Early Ordovician sponge radiation. Ornamented anthaspidellid sponges commonly constructed annulated or irregularly to regularly spaced transverse ridge-and-trough features on their outer-wall surfaces without proportionately increasing the size of their internal wall or gastral surfaces. This efficient technique of modifying only the sponge’s outer surface without enlarging its entire skeletal frame conserved the sponge’s constructional energy while increasing outer-wall surface-to-fluid exposure for greater intake of nutrient bearing currents. Sponges with widely spaced ridge-and-trough ornament dimensions predominated in high-energy settings. Widely spaced ridges and troughs may have given the sponge hydrodynamic benefits in high wave force settings. Ornamented sponges with narrowly spaced ridge-and-trough dimensions are found in high energy paleoenvironments but also occupied moderate to low-energy settings, where their surface-to-fluid exposure per unit area exceeded that of sponges with widely spaced surface ornamentations.
    URI
    http://hdl.handle.net/1808/24771
    DOI
    https://doi.org/10.17161/1808.24771
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    • 1. Paleontological Contributions (2009-present) [32]

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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