branchiostegal

branchiostegal

(ˌbræŋkɪəˈstiːɡəl)
adj
(Zoology) zoology of or relating to the operculum covering the gill slits of fish: branchiostegal membrane; branchiostegal rays.
[from branchia + Greek stegos roof]
References in periodicals archive ?
In opercular rotation, opercles are rotated outward and the branchial basket expands downward with separation of the branchiostegal rays; the body is tilted slightly head-downward with median fins rigidly fanned out (Figs.
Cervical spines corneous; branchiostegal areas of carapace smooth to slightly granular, dorsal surface with scattered punctations.
0108); taken as a natural group, they might be characterized morphologically by the presence of an epipod on third maxilliped, pleurobranchiae on fifth pereiopod, ventral and dorsal rostral teeth, as well as by the absence of branchiostegal, pterygostomian and parapenaeid spines, and transverse and longitudinal sutures on carapace.
3A) Head and dorsal half of trunk gray to greenish brown, ventral half of trunk pale; 6-8 dark brown markings along length of trunk laterally, at least some of them resembling wide crosses that are widest along lateral midline; markings on left and right portions of trunk connected to one another across dorsal midline to form saddles; trunk also with several thin orange-yellow stripes dorsally, stripes thicker or broken into orange blotches ventrally; groove above maxilla with stripe of black pigment from below anterior edge of orbit to posterior end of jaw; posterior edge of branchiostegal membrane pale yellow; scapular region with large black blotch of pigment partially hidden by operculum, length 3.
Its distinctive features include enlarged scales in the posterior interorbital space; scales on the opercle, preopercle, and branchiostegal membranes; transverse sensory papillae on the cheek; and no preopercular pores.
We observed preliminary differences in first form male gonopod structure, branchiostegal tubercle presence, chelae shape, size of first form males, and pigmentation (Simon unpubl.
Merisitic elements have the following ranges (from Gomon 1974, Watson 1996, and new California specimens): dorsal fin (X-XII,9-10); anal fin (III,9-10); pectoral fin (14-18); pelvic fins (1,5); branchiostegal rays (6); lateral line scales and pores (28-29); and gill rakers (5-7+9-12=14-19).
Description: Dorsal rays XI,9 (female paratype with XII,9); anal rays 111,9; first dorsal and anal soft rays unbranched, all others branched, the last to base; pectoral rays 15, the upper two un-branched; pelvic rays 1,5; principal caudal rays 13; median 11 unbranched; upper and lower procur-rent caudal rays 6, posteriormost segmented; lateral line interrupted; dorso-anterior series of pored scales 17+7 (17+6-8), scales above lateral line to base of dorsal fin 2; scales below lateral line to base of anal fin 6; median predorsal scales 5; median prepelvic scales 6; circumpeduncular scales 16; horizontal scale rows on cheek 2; gill rakers 13 (1314); branchiostegal rays 5; vertebrae 9 + 16.
The third series (visible only in specimens preserved with ethyl alcohol) begins at the bases of the first branchiostegal rays and extends posteriorly to the cleithrum.
Dorsal rays VI+I, 13 (12-13); anal rays I,13; all dorsal and anal soft rays branched, the last to base; pectoral rays 19, the uppermost and lower 1 or 2 unbranched; pelvic rays I,5, all soft rays branched, the medial rays fully united by membrane; pelvic frenum present; segmented caudal rays 17, 14 (13-14) branched; upper and lower unsegmented caudal rays 7; longitudinal scale series 98 (99-100); transverse scale rows 31 (32-33); circumpeduncular scales about 25; gill rakers 4+13 (4+10-11); pseudobranch with 8 fleshy lobes; branchiostegal rays 5; vertebrae 25.