Protochordata

a division of the phylum Chordata, including the Hemichordata, Urochorda and Cephalochorda. The group lacks a vertebral column, cranium and organs associated with the region of the head in other chordates, but has a dorsal nerve chord and gill slits.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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References in periodicals archive

A long-term study on fused subclones in the Ascidian Botryllus schlosseri: the resorption phenomenon (Protochordata: Tunicata).

The effect of sperm competition on male gain curves in a colonial marine invertebrate

A long-term study of fused subclones in the ascidian Botryllus schlosseri: the resorption phenomenon (Protochordata: Tunicata).

Growth and long-term somatic and germline chimerism following fusion of juvenile Botryllus schlosseri

Thyroid hormone biosynthesis in Agnatha and Protochordata. Gen.

Endostyle cell recruitment as a frame of reference for development and growth in the urochordate Oikopleura dioica

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