gill slit

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gill slit

(gĭl)
n.
1. One of several narrow external openings connecting with the pharynx, characteristic of sharks and related fishes, through which water passes to the exterior, thereby bathing the gills. Also called branchial cleft, gill cleft.
2. Embryology One of several rudimentary invaginations in the surface of the embryo, present during development of all air-breathing vertebrates and corresponding to the functional gill slits of aquatic species. Also called branchial cleft, branchial groove, pharyngeal cleft, pharyngeal groove.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

gill slit

see GILL CLEFT.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
A fifth difference among purebred and hybrid larvae is in the angle of deflection of the gill slits to the right or left of the midline.
Answers: nouns: gill slits, cartilage, lateral lines, prey; verbs: swim, sleep, attack, swallow; adjectives: keen, shallow, endangered, extinct
Some sharks can pump water through their gill slits, allowing them to stay motionless.
The gill slit skeletal bars are commonly opaque, but in 1 of every 10 animals, they are pigmented black.
It's good-bye to fins and gill slits, welcome lungs and hair.
They can grow up to 6 feet in length, have large heads, gill slits and wide mouths.
Color pattern dominated by eight large dark brown saddle blotches, first on occiput, constricted medially, leading obliquely to blotch below eye; second above pectoral fins, followed anteroventrally by two dark blotches, lower over gill slits, followed by two blotches on dorsal surface connecting obliquely to two dark blotches on side, one below and extending into each dorsal fin and two across caudal fin; terminal lobe of caudal fin with irregular dark blotch; scattered small white spots present over body, most conspicuous within and at edges of large dark brown blotches.
Among deuterostomes, gill slits occur in fossil echinoderms (Jeffries, 1986), hemichordates, and chordates.
Cameron said: "Work from my lab has shown that enteropneusts filter feed using a pharynx perforated with gill slits, just like the invertebrate chordates.
Gill openings elongate S-shaped, forming weakly fringed lobe laterally; length of first gill slit 1.13 (1.22) times length of fifth gill slit, 2.91 (3.35) times in mouth width; distance between first gill slits 2.07 (2.29) times internarial space, 0.43 (0.45) times ventral head length; distance between fifth gill slits 1.16 (1.21) times internasal distance, 0.24 (0.24) times ventral head length.
Chordates share several characteristic features including a notochord, a dorsal hollow nerve cord, and pharyngeal gill slits. In addition, lower chordates (including tunicates, amphioxus, and lampreys) share an endostyle.
cerdale holotype term embryo immature Total length cm 55.7 27.7 101.0 Tip of snout to 1st Dorsal origin 34.4 35.0 30.7 2nd Dorsal origin 65.5 63.9 64.6 Upper caudal origin 75.4 74.4 75.8 Lower caudal origin 73.4 72.9 75.4 Anal fin origin 60.7 61.4 64.6 Pelvic fin origin 48.5 48.7 50.1 Pectoral fin origin 24.2 27.4 23.2 Gill slit #1 (top) 29.7 23.5 19.0 Gill slit #5 (top) 25.6 28.5 24.2 Eye origin 8.0 10.5 7.0 Mouth origin 8.6 11.2 8.2 External naris (lateral 4.8 6.5 3.3 end) First dorsal fin Anterior margin 11.3 11.6 14.7 Height 8.6 7.6 10.4 Base length 9.0 8.3 10.7 Free inner margin 4.7 4.7 5.6 Dist.