prechordaten.adj.

Brit.

/priːˈkɔːdeɪt/, U.S.

/priˈkɔrˌdeɪt/,

/priˈkɔrdət/

Origin: Formed within English, by derivation. Etymons: pre- prefix, chordate adj.

Etymology: < pre- prefix + chordate adj.

Zoology.

A. n.

An animal considered to represent an evolutionary stage ancestral to the chordates. Cf. protochordate n.

ΚΠ

1929 W. K. Gregory Our Face from Fish to Man 186 Studnicka..holds that originally there were two pairs of paired eyes in the pre-chordates, one pair dorsal,..the second pair low down on the sides of the head, the eyes of later vertebrates.

1953 Q. Rev. Biol. 28 74/2 Two lines of ascent, the one comprising the echinoderms, prechordates, and chordates, and the other embracing all the remaining invertebrate phyla.

2006 Clin. Anat. 19 71/1 The turbinates..are derived from the prechordal plate, which is part of the sensory capsules that protected the sense organs..of the ancestral prechordates.

B. adj.

That is an evolutionary ancestor of the chordates; occurring or originating prior to the evolution of the chordates.

ΚΠ

1933 Trans. Amer. Philos. Soc. 23 85 Undiscovered and hypothetical prechordate stage, possibly resembling in fundamental characters the ‘Tornaria’ larva of Balanoglossus.

1993 Proc. National Acad. Sci. U.S.A. 90 6304/1 Gans and Northcutt have argued that the vertebrate head is a recent innovation, since elements relevant to its formation are absent from prechordate and primitive chordate forms.

2006 Molec. Biol. & Evol. 23 20/1 The growing notion that vertebrate genomes are the product of genome duplications of an ancestral prechordate genome.

This is a new entry (OED Third Edition, December 2006; most recently modified version published online March 2022).

单词	prechordate
释义	prechordaten.adj. Brit. /priːˈkɔːdeɪt/, U.S. /priˈkɔrˌdeɪt/, /priˈkɔrdət/ Origin: Formed within English, by derivation. Etymons: pre- prefix, chordate adj. Etymology: < pre- prefix + chordate adj. Zoology. A. n. An animal considered to represent an evolutionary stage ancestral to the chordates. Cf. protochordate n. ΚΠ 1929 W. K. Gregory Our Face from Fish to Man 186 Studnicka..holds that originally there were two pairs of paired eyes in the pre-chordates, one pair dorsal,..the second pair low down on the sides of the head, the eyes of later vertebrates. 1953 Q. Rev. Biol. 28 74/2 Two lines of ascent, the one comprising the echinoderms, prechordates, and chordates, and the other embracing all the remaining invertebrate phyla. 2006 Clin. Anat. 19 71/1 The turbinates..are derived from the prechordal plate, which is part of the sensory capsules that protected the sense organs..of the ancestral prechordates. B. adj. That is an evolutionary ancestor of the chordates; occurring or originating prior to the evolution of the chordates. ΚΠ 1933 Trans. Amer. Philos. Soc. 23 85 Undiscovered and hypothetical prechordate stage, possibly resembling in fundamental characters the ‘Tornaria’ larva of Balanoglossus. 1993 Proc. National Acad. Sci. U.S.A. 90 6304/1 Gans and Northcutt have argued that the vertebrate head is a recent innovation, since elements relevant to its formation are absent from prechordate and primitive chordate forms. 2006 Molec. Biol. & Evol. 23 20/1 The growing notion that vertebrate genomes are the product of genome duplications of an ancestral prechordate genome. This is a new entry (OED Third Edition, December 2006; most recently modified version published online March 2022). < n.adj.1929
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