spiracle

What is spiracle?

spiracle meaning one of the external openings communicating with the air tubes (tracheae) or book lungs of certain arthropods; a tubular opening, formed from the modified first gill cleft, communicating with the gill cavity of certain ganoid (e.g., gar pike, bowfin) and all elasmobranch fishes

 

reference: Coral Reef Information System – Glossary

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