Trykawka (biology)

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Spike (left) and Taeniura lymma eyes

Spiraculum (Latin spiraculum) - a small external gill nostril that occurs in many species of osteoporosis and some sphagnum fish. He was born from the first gill. It is located just behind the eye, between the mandibular and the mandibular arch. There are reduced gills (juveniles), present in the form of adolescents, in adults sometimes reduced. A tick is a component of the respiratory tract that connects the gill chambers to the external environment. It is a homologous organ with central ear cavity and Eustachian tube of vertebrate.

The sprinkles are parched. They are used to collect water for gills.

Largest sizes are the rays of the raincoat. Bibliography

wiki

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