Fossil species appear to persist morphologically unchanged for long
intervals of geologic time, punctuated by short bursts of rapid
change as explained by the Ecological Evolutionary Units (EEUs).
Here, morphological variation in Paleozoic atrypide morphology at
the subfamily level (Atrypinae and Variatrypinae) from the Silurian
and Devonian time intervals in the third Paleozoic EEU (~444-359
my) were investigated using relatively new techniques of
quantitative modeling. The study explains how a group of closely
related taxa in atrypide subfamilies exhibit morphological
conservation through time in P3 EEU within the Eastern North
America region.
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