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XB-STAGE-55
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Name: NF stage 41
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XAO Id: XAO:1000053
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Definition: Nieuwkoop and Faber stage 41; age 3 days, 4 hr at 22-24 Celsius; corresponding to the following external morphological criteria: Gills broader and flatter, more laterally directed. Formation of a left-rostral and a right-caudal furrow in yolk mass; torsion of interjacent part about 45 degrees; formation of conical proctodeum, forming angle of about 60 degrees with tail myotomes. Formation of fin rostral to proctodeum; ventral outline of yolk mass and proctodeum a smooth concave line. Length: 6.7 - 7.5 mm.
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[2.8.5]
