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    The Orientation Of Strophomenid Brachiopods On Soft Substrates

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    Plotnick et al 2013 strophomenids.pdf (985.1Kb)
    Date
    2013-11-01
    Author
    Plotnick, Roy
    Dattilo, Benjamin
    Piquard, Daniel
    Bauer, Jennifer
    Corrie, Joshua
    Publisher
    Journal of Paleontology
    Metadata
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    Abstract
    Strophomenid brachiopods have long been interpreted as ‘‘snowshoe’’ strategists, with their flattened concavoconvex valves providing resistance to foundering in very soft sediments. There has been a sharp difference of opinion in whether the shells were oriented with their convex or their concave surface in contact with the sediment. This study, along with independent evidence from sedimentology, ichnology, and morphology, indicates that the strophomenids lived with their shells concave down (convex up). Experiments indicate the force required to push shells into soft cohesive muds is much greater for the convex up than for the convex down orientation. Forces also increase with shell curvature. All measured forces greatly exceed estimates of the downward force exerted by the weight of the shell, indicating that foundering resistance may not have been the key functional requirement. Instead, a convex up orientation would have provided resistance to overturning in currents, in particular if the valves gaped widely. The ‘‘snowshoe’’ may not be the relevant paradigm for the shell morphology of these forms. An alternative is that they functioned more as a tip-resistant base, similar to those of garden umbrellas or stanchions.
    Subject
    functional morphology, brachiopods
    Type
    Article
    Date available in INDIGO
    2013-09-09T16:19:08Z
    URI
    http://hdl.handle.net/10027/10084
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    • Publications - Earth and Environmental Sciences

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