Spiracle
Spiracle or spiraculum may refer to: * Spiracle (arthropods), opening in the exoskeletons of some arthropods * Spiracle (vertebrates), openings on the surface of some vertebrates * Spiraculum, a genus of land snails in family Cyclophoridae Cyclophoridae is a taxonomic family of small to large tropical land snails with an operculum, terrestrial gastropod mollusks in the order Architaenioglossa belonging to the subclass Caenogastropoda (according to the taxonomy of the Gastropo ...

Spiracle (vertebrates)
Spiracles () are openings on the surface of some animals, which usually lead to respiratory systems. The spiracle is a small hole behind each eye that opens to the mouth in some fish. In the jawless fish, the first gill opening immediately behind the mouth is essentially similar to the other gill opening. With the evolution of the jaw in the early jawed vertebrates, this gill slit was caught between the forward gill-rod (now functioning as the jaw) and the next rod, the hyomandibular bone, supporting the jaw hinge and anchoring the jaw to the skull proper. The gill opening was closed off from below, the remaining opening was small and hole-like, and is termed a spiracle. In many species of sharks and all rays the spiracle is responsible for the intake of water into the buccal space before being expelled from the gills. The spiracle is often located towards the top of the animal allowing breathing even while the animal is mostly buried under sediments. As sharks adapted a faster ...
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Spiracle (arthropods)
A spiracle or stigma is the opening in the exoskeletons of insects and some spiders to allow air to enter the trachea. In the respiratory system of insects, the tracheal tubes primarily deliver oxygen directly into the animals' tissues. The spiracles can be opened and closed in an efficient manner to reduce water loss. This is done by contracting closer muscles surrounding the spiracle. In order to open, the muscle relaxes. The closer muscle is controlled by the central nervous system, but can also react to localized chemical stimuli. Several aquatic insects have similar or alternative closing methods to prevent water from entering the trachea. The timing and duration of spiracle closures can affect the respiratory rates of the organism. Spiracles may also be surrounded by hairs to minimize bulk air movement around the opening, and thus minimize water loss. Although all insects have spiracles, only some spiders have them, such as orb weavers and wolf spiders. Ancestrally, spide ...
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Spiraculum
''Spiraculum'' is a genus of operculate land snails in the subfamily Cyclophorinae of the family Cyclophoridae Cyclophoridae is a taxonomic family of small to large tropical land snails with an operculum, terrestrial gastropod mollusks in the order Architaenioglossa belonging to the subclass Caenogastropoda (according to the taxonomy of the Gastropo ..., native to parts of Asia. Species ;Synonyms: * ''Spiraculum gordoni'' (Benson, 1863): synonym of '' Cyclotus gordoni'' (Benson, 1863) (unaccepted combination) * ''Spiraculum grohi'' Thach & F. Huber, 2018: synonym of '' Cyclotus grohi'' (Thach & F. Huber, 2018) (original combination) * ''Spiraculum harryleei'' Thach & F. Huber, 2018: synonym of '' Cyclotus harryleei'' (Thach & F. Huber, 2018) (original combination) * ''Spiraculum thachi'' (F. Huber, 2017): synonym of ''Spiraculum huberi'' (Thach, 2016) (junior synonym) * ''Spiraculum (Pseudospiraculum)'' Kobelt, 1902 represented as ''Spiraculum'' Pearson, 1833 * ''Spira ...
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