One of the external openings communicating with the air tubes or tracheæ of insects, myriapods, and arachnids. They are variable in number, and are usually situated on the sides of the thorax and abdomen, a pair to a segment. These openings are usually elliptical, and capable of being closed. See Illust. under Coleoptera.
A tubular orifice communicating with the gill cavity of certain ganoid and all elasmobranch fishes. It is the modified first gill cleft.
Any small aperture or vent for air or other fluid.
An aperture in the body wall used for breathing. Its analogous to our nose. In Manduca, they are found on the sides of certain thoracic and abdominal segments. Internally, the connect to trachea.
an aperture or opening through which air is admitted and expelled
External opening in the body wall for a tracheal air tube, which forms part of the respiratory system of an insect; in most chalcids at least three sets of spiracles are visible, the mesothoracic spiracle, propodeal spiracle, and metasomal spiracle, as well as sometimes a metathoracic spiracle. [drawing
External opening of the trachea; breathing pore.
the opening of the respiratory system located along the lateral side of the body.
1.) The small opening to the outside from the gill chamber in anuran tadpoles (Peters 1964). 2.) An opening on the back part of the head (above and behind the eye).
opening behind eyes of sharks and rays.
breathing holes on both sides of the segments of an insect's body.
(spy´ rih kel) [L. spirare: to breathe] • An opening of the treacheal respiratory system of terrestrial arthorpods.
In tadpoles, an opening to the outside from the gill chamber.
Breathing pore; external opening of the tracheal system in an insect.
in insects, a pore through which diffusion of gases, or respiration, takes place
a breathing pore or aperture. Spiracles are paired, lateral holes in the plural (side) wall of insect body segments and are the means by which air enters the tracheal (respiratory) system. View image
an opening in the head anterior to and above the opercular opening representing a primitive gill-cleft, in lampreys, hagfishes, sharks, and rays
one of the "breathing holes" that run down the sides of an insect's thorax and abdomen. Spiracles are the external openings of all insects' respiratory systems.
tubelike external opening from the gill chambers in tadpoles
An opening on each side of the head used in respiration.
Lateral opening to the respiratory system; one pair on T1 and on A1 to A8 (see Figures 1 and 2).
Spiracles are small openings on the surface of the abdomen of butterflies and caterpillars that allow air to enter the trachea. [More
A small, round or oval lateral opening on a body segment through which air enters the tracheae.
any of several tracheal openings in the exoskeleton of an insect or a spider. BACK
opening which leads to a trachea in an insect, arachnid, isopod, centipede or millipede.
An external opening along the body of insects used for air intake.
respiratory openings on the thorax and abdomen that allow air to enter the trachea. [More
A hole in the sides of insects through which the tracheal respiratory system connects with the exterior, and which can be opened and closed.
In insects and some other terrestrial arthropods, a small opening through which air is taken into the tracheae. Insects have several spiracles, arranged along the sides of the abdomen.
Opening on the heads of some fishes, such as the Lake Sturgeon ( Acipenser fulvescens), located above and behind the eyes, and connecting the throat cavity to the outside.
A spiracle is one of an insect's breathing pores. They are usually located on the thorax and abdomen.
Spiracles are small openings on the surface of animals that usually lead to respiratory systems.