branchial arch

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Related to gill arch: Gill raker

branchial arch

[′braŋ·kē·əl ′ärch]
(vertebrate zoology)
One of the series of paired arches on the sides of the pharynx which support the gills in fishes and amphibians.
References in periodicals archive ?
Van Den Bosch (1984), Hovestadt and Hovestadt-Euler (2011), and Welton (2013) figure gill rakers from Recent Cetorhinus maximus, representing central through distal positions along the gill arch, from individuals of both sexes, and a range of body lengths.
Trends from a distal to central position on the gill arch include increasing curvature of the filament base, increasing basal length, increasing length of the medial process, development of a concave mesial edge of the medial process in the most central gill takers, and an increase in gill raker length, with the longest gill rakers either in the central-most position on the gill arch (Hovestadt and Hovestadt-Euler, 2011) or just distal to the central position (Welton, 2013, fig.
Midlateral band dark or black green; iris black; pupil translucent, dark gray or black; 36-40 (mode = 38) gill rakers on lower limb of the first gill arch .
nigrofasciata are distinguished by gill-raker numbers on the lower limb of the first gill arch, the first species with 24 to 31 (mode = 27), the second with 36 to 40 (mode = 38).
Table 3 Counts of female parasites by gill arch attachment (1st=exterior arch, 4th=interior arch).
The infested gill arch was determined for 83% of the Naobranchia occidentalis and for 97% of the Nectobrachia indivisa (Table 3).
The second (and third to some degree) spines of the first dorsal are elongated, there are 9 dorsal and 8 anal rays, the middle rays of the pectoral fin are branched, there is a single branch in the fifth pelvic fin ray, the basal membrane is 7-18% of the length of the fifth fin ray and there are 19-22 gill rakers on the outer margin of the first gill arch.
8-9) dorsal-fin rays; more outer gill rakers on the first gill arch (usually 4-5 + 15-18 vs.
Gill rakers on first lower gill arch small and stubby, smaller than half diameter of pupil, two specimens with same gill raker number but much more slender.
Diagnosis: Mouth enlarged, upper jaw reaching to below posterior half of pupil; gill opening broad, extending forward to below middle of eye; lower rakers on outer face of first gill arch 11-12, elongate and pointed; pectoral fins 14-15; lateral scale count 25-26; TRB 8; predorsal scales 8-11; caudal peduncle relatively long and slender, the depth 3.