Interoperculum

In`ter`o`per´cu`lum

    (~lå)
n.1.(Anat.) The postero-inferior opercular bone, in fishes.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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During the study comparative age determinations were performed on a total of 243 fish samples by using the operculum suboperculum preoperculum interoperculum and vertebrae bony structures.
Then bony structures (operculum suboperculum preoperculum interoperculum and vertebrae) were
The lowest agreement in the compared bony structures was between preoperculum and interoperculum and between interoperculum and vertebrae with 90.79%.
Between the operculum age and interoperculum age (Fig.
Suboperculum fully covered with cycloid scales; interoperculum fully covered by one row of cycloid scales; cheeks fully scaled; postorbital squamation with two rows of different-sized scales; size of occipital scales not significantly smaller than dorsal scales; predorsal squamation pattern irregular; cycloid and weakly ctenoid scales on dorsum rostrally, more strongly ctenoid scales increasing caudally; flanks with strongly ctenoid scales (Fig.
The combination of morphological features that include large scales (43-45 in lateral row from upper opercle to caudal fin base), 3-4 preopercular spines, a relatively narrow supracleithrum with pronounced serrae on its posterior upper margin, serrate interoperculum, and a posterior margin of the preorbital bone that is attached and hidden by skin and scales serve to distinguish it from all known angelfishes, although it appears to be a modified Centropyge.
Grosse Schuppen (43-45 in einer seitlichen Reihe vom oberen Operculum bis zur Schwanzflossenbasis), 3-4 Praoperculum-Stacheln, ein relativ schmales Supracleithrum mit deutlichen Sagezahnchen am hinteren oberen Rand, ein gesagtes Interoperculum sowie ein Hinterrand des Praorbitalknochens, den anheftende Haut und Schuppen verdecken--das sind Merkmale, die insgesamt diese neue Art von allen anderen Kaiserfischen unterscheiden, wobei sie schon als zu Centropyge gehorig erscheint.
The genus Centropyge has been traditionally defined (see Weber and De Beaufort, 1936: 159; Fraser-Bruner, 1933) as relatively small angelfishes (usually < 10 cm SL) with the following combination of features: scales large, usually 50 or less in lateral row between upper operculum and caudal fin base, arranged in more or less regular transverse rows; interoperculum relatively small and serrate, remote from suboperculum; hindmargin of preorbital free, prominently serrate or with strong spines; interorbital width equal to or less than eye; scales on operculum in five or fewer transverse rows.
The salient features of the new species include the following features that agree with the definition of Centropyge: a relatively small body size, small scales arranged in regular transverse rows, a relatively small, serrate interoperculum and the least interorbital width slightly narrower than eye diameter.
No deep groove visible between isthmus and interoperculum. Gill opening broad, ending ventrally slightly above ventral edge of P base.