part of start stage end stage anal fin musculature muscle anal retractor zebrafish_anatomy Longitudinal unpaired muscle that attaches to the base of the most posterior ray of the anal fin (usually ray 14) and runs posteriorly into he hypaxial musculature of the caudal fin. The anal retractor pulls the anal fin toward the body. 2018-02-12T10:14:25Z infracarinalis posterior ZFA:0005896 retractor analis ceriv unknown adult