agnathann.adj.

Brit.

/aɡˈneɪθən/, U.S.

/ˌæɡˈneɪθən/

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin Agnatha , -an suffix.

Etymology: < scientific Latin Agnatha (E. D. Cope 1889, in Amer. Naturalist 23 852; < a- a- prefix⁶ + ancient Greek γνάθος jaw (see -gnath comb. form) + scientific Latin -a -a suffix²) + -an suffix.

Zoology.

A. n.

Any of the jawless fishes constituting the superclass (formerly the class) Agnatha, which comprises living cyclostomes (lampreys and hagfishes) and many early extinct forms, including ostracoderms and the ancestors of jawed vertebrates.

ΘΚΠ

the world > animals > fish > superclass Agnatha > [noun] > member of

agnathan1939

1939 J. A. Moy-Thomas Palaeozoic Fishes i. 2 The head of a hypothetical primitive Agnathan must have had a terminal mouth and been segmented in a manner similar to the rest of the body.

1978 Sci. Amer. Sept. 111/1 The early jawless fishes, the agnathans, are first known from late Cambrian fossils.

2000 C. Tudge Variety of Life i. v. 86 Hagfishes, however, seem to be the most primitive of all the known agnathans, whereas lampreys seem to be closely related to gnathostomes.

B. adj.

Belonging to the superclass Agnatha; characteristic of or relating to this group. Cf. agnathous adj.

ΘΚΠ

the world > animals > fish > superclass Agnatha > [adjective]

agnathan1957

1957 Q. Jrnl. Microsc. Sci. 98 164 The lampreys..have probably diverged little from the structure of the agnathan ancestor of the jawed vertebrates.

1985 A. Wheeler World Encycl. Fishes (ed. 2) p. vii/2 The 32 known species of lamprey and the related hagfishes are the sole survivors of the agnathan fishes.

2002 S. J. Gould Struct. Evolutionary Theory xi. 1273 A rod-like element of an ancestral agnathan gill arch exhibited sufficient malleability..to become the..malleus of the mammalian middle ear.

This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021).

单词	agnathan
释义	agnathann.adj. Brit. /aɡˈneɪθən/, U.S. /ˌæɡˈneɪθən/ Origin: A borrowing from Latin, combined with an English element. Etymons: Latin Agnatha , -an suffix. Etymology: < scientific Latin Agnatha (E. D. Cope 1889, in Amer. Naturalist 23 852; < a- a- prefix⁶ + ancient Greek γνάθος jaw (see -gnath comb. form) + scientific Latin -a -a suffix²) + -an suffix. Zoology. A. n. Any of the jawless fishes constituting the superclass (formerly the class) Agnatha, which comprises living cyclostomes (lampreys and hagfishes) and many early extinct forms, including ostracoderms and the ancestors of jawed vertebrates. ΘΚΠ the world > animals > fish > superclass Agnatha > [noun] > member of agnathan1939 1939 J. A. Moy-Thomas Palaeozoic Fishes i. 2 The head of a hypothetical primitive Agnathan must have had a terminal mouth and been segmented in a manner similar to the rest of the body. 1978 Sci. Amer. Sept. 111/1 The early jawless fishes, the agnathans, are first known from late Cambrian fossils. 2000 C. Tudge Variety of Life i. v. 86 Hagfishes, however, seem to be the most primitive of all the known agnathans, whereas lampreys seem to be closely related to gnathostomes. B. adj. Belonging to the superclass Agnatha; characteristic of or relating to this group. Cf. agnathous adj. ΘΚΠ the world > animals > fish > superclass Agnatha > [adjective] agnathan1957 1957 Q. Jrnl. Microsc. Sci. 98 164 The lampreys..have probably diverged little from the structure of the agnathan ancestor of the jawed vertebrates. 1985 A. Wheeler World Encycl. Fishes (ed. 2) p. vii/2 The 32 known species of lamprey and the related hagfishes are the sole survivors of the agnathan fishes. 2002 S. J. Gould Struct. Evolutionary Theory xi. 1273 A rod-like element of an ancestral agnathan gill arch exhibited sufficient malleability..to become the..malleus of the mammalian middle ear. This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021). < n.adj.1939
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