mesothoraxn.
/ˌmɛsə(ʊ)ˈθɔːraks/, U.S. /ˌmɛzoʊˈθɔˌræks/; see also meso- comb. form. Entomology.
The middle segment of an insect's thorax, bearing the forewings (or wing cases) and middle legs. Cf. metathorax n., prothorax n.
ΚΠ
1826 W. Kirby & W. Spence Introd. Entomol. III. xxxiii. 371 Mesothorax (the Mesothorax). That segment of the alitrunk which bears the Elytra, or the anterior pair of wings.
1833 G. R. Gray Entomol. Austral. i. 18 The mesothorax [of Trigonoderus Childrenii] is somewhat triangular in form, and keeled down the centre.
1870 G. Rolleston Forms Animal Life 77 The dorsal part of the mesothorax.
1935 R. E. Snodgrass Princ. Insect Morphol. viii. 158 A third stage was inaugurated with the transformation of the paranotal lobes of the mesothorax and the metathorax into movable organs of true flight.
1969 R. F. Chapman Insects i. 10 Running through the neck are..dorsal muscles from the antecostal ridge of the mesothorax to the postoccipital ridge.
1994 Nature 21 Apr. 696/2 We suggest that a homeotic mutation..transformed the second thoracic segment (T2) to a metathorax and the third (T3) to a mesothorax in the ancestral strepsipteran lineage.
This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022).
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