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- JEFFERIES, R. P. S.; PROKOP, R. J.
- Biological journal of the Linnean Society 1972 v.4 no.2 pp. 69-115
- Echinodermata; Ordovician period; Urochordata; ancestry; evolution; eyes; fossils; new species; swimming; tadpoles; vertebrates; Czechoslovakia
- ... The paper describes a new member of a group of Lower Palaeozoic marine fossils which partly bridge the gap between echinoderms and chordates. Evidence suggests that this group included the ancestors of the vertebrates. Its members are traditionally regarded as primitive echinoderms, but are better seen as primitive chordates with echinoderm affinities. They form a basal subphylum of chordates-the ...