Keywords: HederelloidSEM.jpg Scanning electron microscope image of a hederelloid from the Devonian of Michigan largest tube diameter is 0 75 mm Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html 2007-05-26 Wilson44691 wikipedia en Wilson44691 original upload log page en wikipedia HederelloidSEM jpg 2007-05-26 16 40 Wilson44691 457×383×8 63836 bytes <nowiki>I took this photograph </nowiki> Devonian life Scanning electron microscopic images Hederelloidia Hederelloidea fossils |