pre-operculum

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pre-operculum
pre-operculum, præ- (priːəʊˈpɜːkjʊləm) [f. præ, pre- A. 4 + operculum.] 1. Ichth. The foremost of the four bones forming the operculum in fishes.1828 Stark Elem. Nat. Hist. I. 454 Head scaly; operculum with spines, and the preoperculum with dentations. 1880 Günther Fishes 80 The side of the skull, i... Oxford English Dictionary
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pre-opercle
pre-oˈpercle Also -cule. Anglicized form of pre-operculum.1858 Mayne Expos. Lex. s.v., A bony formation on which the operculum, or lid of the gills play: the preopercule. 1886 Cassell's Encycl. Dict., Preopercle. So Cent. Dict., etc. Oxford English Dictionary
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Stolephorus indicus, Indian anchovy : fisheries, bait - FishBase
Dorsal spines (total): 0; Dorsal soft rays (total): 15-17; Anal spines: 0; Anal soft rays: 19 - 21.Diagnosis: Body slender, elongate, rather round in cross-section, belly rounded, with 2-6 small needle-like pre-pelvic scutes; maxilla tip pointed, reaching to or only just beyond front border of pre-operculum; hind border of pre-operculum convex, rounded; lower gillrakers 20-28; isthmus muscle ...
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Stolephorus commersonnii, Commerson's anchovy : fisheries - FishBase
Anal spines: 0; Anal soft rays: 21 - 22.Diagnosis: Body somewhat compressed, belly a little rounded, with 0-5 small needle-like pre-pelvic scutes; maxilla tip pointed, reaching to or a little beyond hind border of pre-operculum, the latter convex, rounded; lower gillrakers usually 23 to 28; small teeth present on upper edge of hyoid bones; isthmus muscle tapering evenly forward to hind border ...
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