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BAPX1 expression in the first branchial arch marks a potential deleterious mechanism that can lead to oculo-auriculo-vertebral spectrum (25).
Bigelow & Schroeder 1948:150) estimated the number of gill rakers in one series on one branchial arch to be 1260.
Arrest in the development of the first branchial arch due to an insult to the neural crest cells has been suggested to be the cause of this malformation, which may be induced by chromosomal mutation or teratogens (4).
3,4) Embryologically, it is a derivative of the second branchial arch along with styloid ligament and the lesser cornu of the hyoid bone.
Cusps of non-symphysial teeth in premaxillary internal series in straight line or in slightly concave arch in ventral view; usually more than 2 maxillary teeth; external premaxillary series with 4 to 6 teeth, penta to heptacuspidate; premaxillary internal series with 5 teeth; first branchial arch usually 21 (9 + 13) to 29 (12 + 16) gill-rakers; a brown narrow and vertically elongate humeral blotch
Distinguished from all other congeners by the combination of the following features: anterior portion of trunk slightly deeper than wide, jaws slightly elongated, snout pointed, tip of anal fin slightly pointed in male, caudal fin rounded in male, pelvic-fin tip reaching anterior portion of anal-fin base in male, dorsal-fin origin on vertical between base of penultimate and last anal-fin ray, dorsal-fin rays 7-9, anal-fin rays 13-15, frontal squamation E or D-patterned, frontal scales arranged circularly, canal preopercular short and opened, contact organs on flank scales in male, longitudinal series of scales 40-45, gill rakers of first branchial arch 2 + 10, pink stripes on flank, jaws not distinctively pigmented, and round black spot on dorsal portion of caudal fin in female.
It has been proposed that choristoma of the middle ear could be part of a syndrome characterized by embryonic developmental anomalies, as suggested by its frequent association with ossicular chain, facial nerve, and second branchial arch anomalies.
38) The 2nd branchial arch enlarges caudally, extending toward the enlarging epicardial ridge of the 5th branchial arch.
Summary of soft anal rays, pectoral rays, and total gill rakers on the first branchial arch for three species of Amphiprion.
Our differential diagnoses included branchial arch remnant, cervical rib, lymph node or ingested migrated fish bone.
This may be due to the developmental reason, since both the muscles are derived from the same source, the post-sixth branchial arch.
Gill rakers small, the longest on first branchial arch less than half length of longest gill filaments.