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Hyattechinus pentagonus (aboral)
Hyattechinus pentagonus (aboral)
Description Upper side: The broad interambulacra are covered with many columns of imbricating plates. The ambulacra are very narrow.
Diameter 49 mm; Lower Carboniferous, Pennsylvania, USA.
HVT Author Schultz, Heinke JPG file - 161.63 kB - 852 x 810 pixels added on 2005-02-23201 viewsEchinoidea taxaDigital photo, part of species Hyattechinus pentagonus Jackson, 1912 †checked Kroh, Andreas 2021-02-24From reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Schultz, Heinke
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