In science, philandering is not downright illegal. Nevertheless, excursions into fields outside one's own specialty are always risky. Therefore we welcome the critical remarks of a respected crinoid expert.

Our study has been based on available fossils and their functional interpretation—whether or not the proposed hypothetical models agree with what we know about the physiology of the modern survivors. It also was framed by a more general question (Seilacher, 2005): How did sessile filter feeders cope with the earlier evolutionary “mistake” (to give up mobility) when they turned into secondary soft-bottom dwellers? As it turns out, there is...

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