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The pseudobranch, also pseudobranchia, is the reduced first gill arch of a fish (on the inner surface of the opercle, near the junction of the preopercle) as well as a reduced "false" gill in some gastropods.

In teleost fish, the pseudobranchs are mostly without respiratory function, and in elasmobranchs they are the gill arch of the spiracle. The function of the pseudobranch is unknown, but it is believed that it supplies highly oxygenated blood to the optic choroid and retina[1] and may have baroreceptor (pressure) and thermoregulation functions. It may also be a site of oxygen chemoreception.

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  1. ^ Mölich, Andreas; Waser, Wolfgang; Heisler, Norbert (1 May 2009). "The teleost pseudobranch: a role for preconditioning of ocular blood supply?". Fish Physiology and Biochemistry. 35 (2): 273–286. doi:10.1007/s10695-008-9207-4. ISSN 1573-5168. PMID 19343522. S2CID 1481041. Retrieved 18 October 2022.