A spiracle is a small hole found behind each eye. These can be tiny and circular, such as found on the nurse shark (Ginglymostoma cirratum), to extended and slit-like, such as found on the wobbegongs (Orectolobidae). Many larger, pelagic species, such as the mackerel sharks (Lamnidae) and the thresher sharks (Alopiidae), no longer possess them.
A spiracle is a small hole found behind each eye These can be tiny and circular such as found on the nurse shark (Ginglymostoma cirratum) to extended and slit-like such as found on the wobbegongs (Orectolobidae) Many larger pelagic species such as the mackerel sharks (Lamnidae) and the thresher sharks (Alopiidae) no longer possess them