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B David, B Lefebvre, R Mooi, R Parsley - Paleobiology, 2000 - cambridge.org

Are homalozoans echinoderms? An answer from the extraxial-axial theory.

Theoretical frames STEM

David, Lefebvre, Mooi

GSID: fuCtcrNAKywJ

Excerpt

… by two hypotheses (H): as stem taxa to echinoderms (HI) or as stem taxa to chordates (H2). … marginal frame), and stylophorans (if the an cestor they had in common with crinoids had a …

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