spirifer (suomeksi)

Määritelmät:

(lb, en, paleontology) Any of numerous species of fossil brachiopods of the genus, genera †(taxlink, Spirifer, genus, noshow=1) and †(taxlink, Delthyris, genus, noshow=1) and allied genera in order †''(taxlink, Spiriferida, order, noshow=1)'', in which the long calcareous supports of the arms form a large spiral, or helix, on each side.