a.1.(Anat.) Situated in front of the operculum; pertaining to the preoperculum.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The cephalic lateral line canals of bony fishes are contained in dermal skeletal elements of the cranium related to some bones like the preopercular, infraorbital, supraorbital and mandibular bones among others, forming the cephalic lateral line canal system (Webb, 1989, 2014; Gibbs, 2004).
Preopercular spines were 2, and the lower was longer than the upper.
Preopercular organ inconspicuous, as a discreet, round, bilobed protuberance on posterior region of sternite VII.
Se caracterizan y distinguen de otros generos por: ausencia de escamas en la base de la region blanda de las aletas dorsal y anal; aleta caudal lunada o truncada, en adultos los lobulos pueden ser filamentosos; el extremo posterior de la aleta pectoral sobrepasa el origen de la aleta anal; boca terminal, region preorbital alta y con marcado perfil angular; presencia de ocho poros sensoriales desarrollados entre el menton y el angulo preopercular, de los cuales cinco corresponden a la region mandibular; por lo general tienen 12 vertebras precaudales y mancha subopercular en todas las especies (a excepcion de T.
All specimens were relatively robust; in specimens [greater than or equal to] 6 mm long, there were large parietal and preopercular spines and melanophores on the lower jaw, on the margins of the pectoral fins, and on the ventral margin of the tail but they were absent on the upper jaw and snout and dorsally and laterally on the trunk and tail.
Their posterior border, although not entirely preserved, seems to cover a good part of the dorsal limb of the preopercular bone, more as in Pachyrizodus than as in Bavarichthys or Rhacolepis; however, it does not seem to reach the opercular bone, as in Goulmimichthys (Cavin, 2001).
Cephalic neuromasts: supraorbital 16-19, parietal 3-4, anterior rostral 1, posterior rostral 1, infraorbital 18-22, preorbital 1-2, otic 1-6, postotic 2-3, supratemporal 1, median opercular 1, ventral opercular 2, preopercular 18-23, mandibular 10-14, lateral mandibular 3-5.
Hembras con organo preopercular prominente en el esternito VII; placa subgenital muy corta, apenas proyectandose mas alla del segmento abdominal VIII; valvas genitales proyectadas; cercos cortos, aplanados y triangulares (CONLE et al., 2011; ZOMPRO, 2004; REDTENBACHER, 1906).
large mouth with thick lips; canine teeth on both jaws, strong and with an enlarged pair nearby the tip, visible when mouth is closed; vomerine tooth patch crescentic to triangular, without a medial posterior extension; preopercular margin with a weak knob; dorsal fin with 10 spines and 14 soft rays; anal fin rounded, with 3 spines and 7 soft rays; pectoral fins short, not reaching level of anus; with 16 to 18 rays; caudal fin nearly truncate.