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Related to branchial arch: branchial arch derivatives

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Autoregressive Conditional Heteroskedasticity

A statistical measure of the average error between a best fit line and actual data that uses past data to predict future performance. General Autoaggressive Conditional Heteroskedasticity is the most common way of doing this. See also: Fractal Distribution.
References in periodicals archive ?
Distinguished from all other congeners by the combination of the following features: anterior portion of trunk slightly deeper than wide, jaws short, snout blunt, tip of anal fin rounded in male, caudal fin rounded in male, pelvic-fin tip reaching the anterior portion of the anal-fin base in male, dorsal-fin origin on vertical between base of 9th and 10th anal-fin rays, dorsal-fin rays 7-8, anal-fin rays 11-13, frontal squamation E-patterned, frontal scales arranged circularly, canal preopercular short and opened, contact organs on flank scales in male, longitudinal series of scales 29-32, gill rakers of first branchial arch 1 + 7, longitudinal rows of reddish brown dots stripes on flank in male, jaws black, and round black spot on dorsal portion of caudal-fin in female.
Distinguished from all other congeners by the combination of the following features: anterior portion of trunk slightly deeper than wide, jaws short, snout blunt, tip of anal fin pointed in male, caudal fin rounded in male, pelvic-fin tip reaching urogenital papilla in male, dorsal-fin origin on vertical between base of 6th and 8th anal-fin rays, dorsal-fin rays 7-8, anal-fin rays 9-10, frontal squamation S-patterned, frontal scales arranged transversely, canal preopercular absent, contact organs absent, longitudinal series of scales 29-30, gill rakers of first branchial arch 1 + 6, longitudinal rows of red dots on flank in male, transverse dark brown bar through the chin, and no distinctive black spot on dorsal portion of caudal-fin.
Distinguished from all other congeners by the combination of the following features: anterior portion of trunk slightly wider than deep, jaws short, snout blunt, tip of anal fin rounded 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 8th and 9th anal-fin rays, dorsal-fin rays 6-7, anal-fin rays 9-10, frontal squamation S-patterned, frontal scales arranged transversely, canal preopercular absent, contact organs on flank scales in male, longitudinal series of scales 32, gill rakers of first branchial arch 1 + 7, transverse black bar through chin, and no black spot on dorsal portion of caudal-fin.
Distinguished from all other congeners by the combination of the following features: anterior portion of trunk slightly deeper than wide, jaws short, snout blunt, tip of anal fin slightly pointed in male, caudal fin rounded in male, pelvic-fin tip reaching middle of anal-fin base in male, dorsal-fin origin on vertical between base of 8th and 9th anal-fin rays, dorsal-fin rays 7-8, anal-fin rays 11-12, frontal squamation S-patterned, frontal scales arranged transversely, canal preopercular absent, contact organs on flank scales in male, longitudinal series of scales 32-33, gill rakers of first branchial arch 1 + 7-8, oblique rows of red dots on flank in male, transverse dark brown bar through the chin, and dark grey to black spot on dorsal portion of caudal-fin in both sexes.
Distinguished from all other congeners by the combination of the following features: anterior portion of trunk slightly deeper than wide, jaws short, snout blunt, tip of anal fin rounded in male, caudal fin truncate in male, pelvic-fin tip reaching middle of anal-fin base in male, dorsal-fin origin on vertical between base of 9th and 10th anal-fin rays, dorsal-fin rays 8-10, anal-fin rays 12-15, frontal squamation S-patterned, frontal scales arranged transversely, canal preopercular absent, contact organs on flank scales in male, longitudinal series of scales 37-41, gill rakers of first branchial arch 1 + 7, red stripes on flank, transverse black bar through the chin, and vertically elongated dark grey to black spot on dorsal portion of caudal-fin in both sexes.
Distinguished from all other congeners by the combination of the following features: anterior portion of trunk deeper than wide, jaws short, snout blunt, 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 8th and 9th anal-fin rays, dorsal-fin rays 10-11, anal-fin rays 13-14, frontal squamation F-patterned, frontal scales arranged circularly, canal preopercular absent, contact organs absent, longitudinal series of scales 31-33, gill rakers of first branchial arch 1 + 7-8, red marks of flank absent, lower jaw black, and round black spot on dorsal portion of caudal-fin in female.
The radiographic findings in this case were consistent with a third branchial arch anomaly.
Almost one of every five cervical masses in the pediatric population is of branchial arch origin.
This unusual anomaly, with the helical crus bridging the concha to unite with the antihelix, represents a malformation of the first and second branchial arch derivatives.