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.

gill slit

see GILL CLEFT.
References in periodicals archive ?
6L, single arrow), and the single gill slit still opens from the pharyngeal lumen just to the left of the ventral midline (Fig.
Harrimaniids and pterobranchs, when compared to ptychoderid enteropneusts, show a reduction and disappearance of coelomic diverticula, gonads, and gill slits.
Why do human embryos develop gill slits they never use for respiration?
Answers: nouns: gill slits, cartilage, lateral lines, prey; adjectives: keen, shallow, endangered, extinct Students will choose and define two new terms in their own words.
One shark accommodated them by swimming back and forth in front of the glass, gill slits quivering, eyes staring vacantly.
The ventral position of the mouth and the presence of the gill slits, instead of gills like those of fish, complete their typical appearance.
Some had red grinning mouths and red, comma-shaped gill slits.
A familiar example is the pharyngula stage of vertebrates, with a notochord, hollow dorsal nerve cord, segmented somites, and pharynx with gill slits.
We could regard the single fertilized cell as comprising a person, or we could select the point at which the fetus has a tail and gill slits and looks much like any other species at a similar point of embryological development.
When a potential fish host consumes a conglutinate, the conglutinate breaks apart, and glochidia passing through the gill slits have the opportunity to attach to the gill filaments.
He'd barely lost the trace of gill slits and already he was a member of the clan of crossings.