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preoperculum (or preopercle), suboperculum (or subopercle), interoperculum (or interopercle) and operculum (or opercle). The preoperculum is a crescent-shaped structure...

fewer dentary teeth (only 15 compared to 16 or 17 of A. calva) and its interopercle membrane bone being smaller. It also has a more pronounced eyespot, has...

prominent spine at an angle at the preopercal. The ventral edge of the interopercle is smooth. The eyes are moderately small along with the mouth that is...

diagonally across the eye from the base of the supraocular spine to the interopercle and the rear band saddles the nape at the base of the parietal spine...

wide as eye, running from eye downward across cheek to anterior end of interopercle, edged on each side by a pale streak. The longfin sculpin has a long...

vertical limb. There are a few small serrations on the subopercle and interopercle. In the juveniles the anterior and posterior nostrils are slightly unequal...

the more noticeable examples of this is a lack of a supraorbital or interopercle bone. A bar strengthening the opercle is also seen in enchodontids along...

joined to the isthmus; the ligament between the interopercle and the mouth is elongated and the interopercle is clearly separated from the retroarticular...

a large, ovular bone with a straight anterior edge. Below it are the interopercle and subopercle, both of which are much smaller than the opercle and are...

peduncle. There is another wide band from maxillary groove to rear end of interopercle. The areas between these bands are frequently marked with small brown...