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Glossary

gill opening

Opening connecting the gill chamber to the exterior environment. Also referred to as the gill slit.

Used in 83 species profiles

Corydoras flaveolus
Erromyzon sinensis
Erromyzon sp. 'ER01'
Erromyzon sp. 'ER02'
Gastromyzon lepidogaster
Hypergastromyzon humilis

Related terms

gill chamber
Chambers located on either side of the head into which the gill filaments project.
lateral scale rows
The number of more-or-less vertically-arranged scale rows present between the upper end of the gill opening and the caudal fin base. Sometimes referred to as vertical scale rows and used in meristic counts when the lateral line is absent, incompletely pored or otherwise difficult to distinguish.
operculum
Flap composed of 4 bones that covers, supports and protects the gill opening in many fishes. Also known as gill flap or gill cover.
spiracle
An external respiratory opening, located between the eye and gill opening in certain, usually primitive, fishes.

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