gill platen.
/ˈɡɪl pleɪt/, U.S. /ˈɡɪl ˌpleɪt/ 1. An operculum or gill cover of a fish (operculum n. 1b); any of the flat bones of which this is formed.
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1804 Trans. Linn. Soc. 7 292 Gill plates and undulated transverse lines along the sides, silvery.
1815 S. L. Mitchill in Trans. Lit. & Philos. Soc. N.Y. 1 413 His second gill plate is finely serrated.
1870 A. Günther Catal. Fishes Brit. Mus. VIII. 146 Gill-cover formed by a large plate..; interoperculum a long fine bone, hidden below the gill-plate.
1952 G. F. Hervey & J. Hems Freshwater Trop. Aquarium Fishes 188 There is a red to orange spot on the gill-plate.
1991 T. A. Giovanetti Discus Fish 40/1 A fish that breathes with one gill plate flared and the other clamped shut almost surely has gill flukes.
2011 W. Bourne Basic Fishing ix. 117/1 Sharp fins, teeth, spines and gill plates can inflict painful injuries.
2. Zoology. A flattened layer of tissue forming a gill or part of one; (in fishes) a flat projection from the surface of a gill filament; a gill lamella.
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the world > animals > animal body > general parts > internal organs and systems > [noun] > lung or gill > membrane covering gills
gill plate1877
branchiostegite1880
1877 Q. Jrnl. Microsc. Sci. 17 47 Each gill-plate thus consists of a single row of filaments bent on itself, so as to form two rows of filaments or lamellæ, with a space between them.
1893 Amer. Naturalist 27 931 (note) Hyrtl..says that the gill-plates are absent on the first and last arches.
1894 Wrkg. Men's College Jrnl. Dec. 139 The larvæ..bear at the extremity of the abdomen three delicate leaf-like gill-plates.
1909 J. A. Thompson in H. H. Newman Readings in Evol., Genetics & Eugenics (1921) xv. 211 The fertilised eggs develop in the outer gill-plate of the mother-mussel.
1922 Sci. Monthly Apr. 347 They [sc. shipworms] feed upon organic matter, living or dead, which is carried in the sea water; this they strain out..while the stream of water passes through their gill plates.
1992 M. Rowland Biol. ix. 208 Blood flows from an afferent vessel in each gill arch down the inner side of each lamella, across the gill plate and back to an efferent vessel.
2010 R. Reid Shark! xxviii. 344 The whale shark..is a filter feeder,..sucking in huge mouthfuls of water, which is then expelled through its gills, trapping plankton and other food against the dermal denticles that line its gill plates and pharynx.
3. Embryology. Each of the pair of thickened ectodermal regions on either side of an amphibian embryo posterior to the head, from which the gills develop.
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1897 T. H. Morgan Devel. Frog's Egg v. 58 The lateral sense-plate is split into an anterior and posterior part on each side. The more anterior part may still be called the sense-plate, SP, and the posterior, the gill-plate, GP.
1927 W. C. Curtis & M. J. Guthrie Textbk. Gen. Zool. xvii. 414 The beginnings of the gill clefts may now be seen upon the gill plate..as vertical grooves separating the branchial arches.
1960 Herpetologica 16 185 At stage 16 the neural folds are closed forming a neural tube; the gill plates become conspicuous, and the embryo begins to develop a recognizable ‘head’.
2012 F. J. Dye Dict. Developm. Biol. & Embryol. (ed. 2) 88 A pair of indentations, the fourth branchial furrows, appear at the posterior margin of each gill plate.
This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022).
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