Definition of echiuran in US English:


adjective & noun

  • See Echiura

    • ‘The body of an echiuran lacks annelid-type segmentation, but the distinctive free-swimming trochophore larval stages of echiurans and polychaetes are very similar.’
    • ‘The plesiomorphic nature of myoepithelial organization of the body wall musculature is evident in adult annelids, echiurans, and sipunculids.’
    • ‘I conclude that the molluscan and annelid crosses cannot be upheld as independent potential synapomorphies of molluscs/sipunculans and echiurans / annelids, respectively.’