supraoccipital hook

supraoccipital hook: a structure in male Kurtus gulliveri (Kurtidae) used for carrying of an egg mass. The hook projects from the dorsal surface of the head and is directed anteriorly and downward nearly forming a closed ring. This hook is formed from the supraoccipital and modified dorsal spines. Females lack a hook. Eggs are carried like a cluster of grapes on the forehead. The epidermis in the cleft of the hook is folded into crypts and lacks secretory and neurosensory cells. The dermis is highly vascularized and engorgement of this area with blood may help hold the egg mass in place

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egg-carrying — attachment of eggs to a fish for incubation, e.g. in Kurtus gulliveri (Kurtidae) where egg masses are attached to the male supraoccipital hook … Dictionary of ichthyology
forehead brooding — carrying of an egg mass on a supraoccipital hook by Kurtus gulliveri (Kurtidae) … Dictionary of ichthyology
Bigeye trevally — Scientific classification Kingdom: Animalia Phylum … Wikipedia
Nurseryfish — Nurseryfishes Scientific classification Kingdom: Animalia Phylum: Chordata Class: Actinopterygii … Wikipedia
auxiliary brooder — a reproductive guild (q.v.) where adhesive eggs are carried in clusters or balls on the spongy skin of the belly, the back, under the pectoral or pelvic fins, or on a hook in the supraoccipital region, or encircled within cols of the female s… … Dictionary of ichthyology

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