Genus Flexor

A clingfish genus differing from all other genera in the family by a combination of characters, including: head and anteriormost part of body similar in width; a relatively elongate body with a small, double adhesive disc located beneath anteriormost part of body; an oval-shaped gap between premaxillae formed by a semicircular indentation along medial edge of premaxilla; premaxilla with a single row of teeth, comprising 2–3 peg-like, conical teeth anteriorly at, and adjacent to, symphysis and 10–12 strongly laterally compressed, incisiviform teeth with strongly recurved cusp, along outer margin of bone; lower jaw with a single row of 14–16 small, conical teeth with sharply pointed and slightly recurved tip; posterior tip of basipterygium expanded and articulating with anteromedial edge of ventral postcleithrum via a shallow concave facet; mandibular portion of preoperculo-mandibular lateral line canal absent; lachrymal canal with two pores; upper and lower lip simple, uniform in thickness along jaw margin (Conway et al. 2018).
The generic name, an anatomical term for muscles, is from the Latin flexus (= to bend) in reference to the great flexibility of clingfishes, many of which have the ability to bend the body so that the tail end comes to lie close to the head.
Author: Bray, D.J. 2021

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Cite this page as:
Bray, D.J. 2021, Flexor in Fishes of Australia, accessed 19 May 2022,


Conway, K.W., Stewart, A.L. & Summers, A.P. 2018. A new genus and species of clingfish from the Rangitāhua Kermadec Islands of New Zealand (Teleostei, Gobiesocidae). ZooKeys 786: 75-104.

Fujiwara, K., Conway, K.W. & Motomura, H. 2021. First record of the Kermadec Clingfish, Flexor incus Conway, Stewart & Summers, 2018 (Gobiesocidae), from New Caledonia and Australia. Check List 17(3): 769–773.