Athenacrinus n. gen. and other early echinoderm taxa inform crinoid origin and arm evolution
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DOI: 10.1017/jpa.2019.87
Abstract: Abstract. Intermediate morphologies of a new fossil crinoid shed light on the pathway by which crinoids acquired their distinctive arms. Apomorphies originating deep in echinoderm history among early nonblastozoan pentaradiate echinoderms distinguish Tremadocian (earliest Ordovician)… read more here.
Keywords: arm; athenacrinus gen; gen early; athenacrinus ... See more keywords