protovertebraten.adj.

Brit.

/ˌprəʊtəʊˈvəːtᵻbrət/,

/ˌprəʊtəʊˈvəːtᵻbreɪt/, U.S.

/ˌproʊdoʊˈvərdəbrət/,

/ˌproʊdoʊˈvərdəˌbreɪt/

Origin: Formed within English, by compounding. Etymons: proto- comb. form, vertebrate n.

Etymology: < proto- comb. form + vertebrate n.

A. n.

Zoology. A member of a group of animals from which vertebrates evolved; an animal considered to represent, or to be related to, an evolutionary ancestor of the vertebrates; a very primitive vertebrate.

ΚΠ

1872 T. Gill Arrangem. Families Fishes p. xix They [sc. leptocardians (Branchiostoma)] undoubtedly have diverged far less, and furnish a better hint as to the protovertebrates than any other form.

1887 J. Cleland in Nature 24 Feb. 391/1 There were two kinds of protovertebrates, namely, piscine and reptilian.

1907 Science 18 Oct. 500/2 Tunicates..were really degenerate and specialized protovertebrates.

1959 C. B. Anfinsen Molec. Basis Evol. xi. 220 Entirely new protein structures might arise, as in the dramatic appearance of insulin and of other hormones at the point in evolution when the protovertebrates and vertebrates appeared.

1989 Lethaia 22 439 The Upper Cambrian and Ordovician could have been a time of great diversity and radiation for protovertebrates, with the evolution of the first true vertebrates resulting from this radiation.

B. adj.

1. Zoology. Of or relating to a protovertebrate or protovertebrates.

ΚΠ

1887 W. K. Parker in Proc. Royal Soc. 42 54 If such proto-vertebrate forms existed, then it is quite supposable that a metamorphosis may..have taken place, of this and that quasi-larval form into archaic reptile, ancestral bird, or primitive mammal.

1933 Q. Rev. Biol. 8 250/1 This is more graphically illustrated by such protovertebrate forms as ostracoderms.

1978 Philos. Trans. (Royal Soc.) B. 282 212 Romer (1972) referred to the protovertebrate head as the ‘visceral animal’ and the tail as the ‘somatic animal’.

2000 Proc. National Acad. Sci. U.S.A. 97 1659/2 It is likely that other protovertebrate clades in the deuterostome lineage..have single clusters [of Hox genes].

†2. Embryology. Of, relating to, or designating a stage of embryonic life in which mesodermal segments exist which subsequently develop into vertebrae and associated muscles. Cf. protovertebra n. 2. Obsolete. rare.

ΚΠ

1890 Cent. Dict. (at cited word) The protovertebrate stage of a vertebrate embryo.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	protovertebrate
释义	protovertebraten.adj. Brit. /ˌprəʊtəʊˈvəːtᵻbrət/, /ˌprəʊtəʊˈvəːtᵻbreɪt/, U.S. /ˌproʊdoʊˈvərdəbrət/, /ˌproʊdoʊˈvərdəˌbreɪt/ Origin: Formed within English, by compounding. Etymons: proto- comb. form, vertebrate n. Etymology: < proto- comb. form + vertebrate n. A. n. Zoology. A member of a group of animals from which vertebrates evolved; an animal considered to represent, or to be related to, an evolutionary ancestor of the vertebrates; a very primitive vertebrate. ΚΠ 1872 T. Gill Arrangem. Families Fishes p. xix They [sc. leptocardians (Branchiostoma)] undoubtedly have diverged far less, and furnish a better hint as to the protovertebrates than any other form. 1887 J. Cleland in Nature 24 Feb. 391/1 There were two kinds of protovertebrates, namely, piscine and reptilian. 1907 Science 18 Oct. 500/2 Tunicates..were really degenerate and specialized protovertebrates. 1959 C. B. Anfinsen Molec. Basis Evol. xi. 220 Entirely new protein structures might arise, as in the dramatic appearance of insulin and of other hormones at the point in evolution when the protovertebrates and vertebrates appeared. 1989 Lethaia 22 439 The Upper Cambrian and Ordovician could have been a time of great diversity and radiation for protovertebrates, with the evolution of the first true vertebrates resulting from this radiation. B. adj. 1. Zoology. Of or relating to a protovertebrate or protovertebrates. ΚΠ 1887 W. K. Parker in Proc. Royal Soc. 42 54 If such proto-vertebrate forms existed, then it is quite supposable that a metamorphosis may..have taken place, of this and that quasi-larval form into archaic reptile, ancestral bird, or primitive mammal. 1933 Q. Rev. Biol. 8 250/1 This is more graphically illustrated by such protovertebrate forms as ostracoderms. 1978 Philos. Trans. (Royal Soc.) B. 282 212 Romer (1972) referred to the protovertebrate head as the ‘visceral animal’ and the tail as the ‘somatic animal’. 2000 Proc. National Acad. Sci. U.S.A. 97 1659/2 It is likely that other protovertebrate clades in the deuterostome lineage..have single clusters [of Hox genes]. †2. Embryology. Of, relating to, or designating a stage of embryonic life in which mesodermal segments exist which subsequently develop into vertebrae and associated muscles. Cf. protovertebra n. 2. Obsolete. rare. ΚΠ 1890 Cent. Dict. (at cited word) The protovertebrate stage of a vertebrate embryo. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.adj.1872
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