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The 5th stage copepodites of this large copepod are glass-clear, with bright red pigment, scattered around the head, thorax and antennules. The coloration of the A1 gets paler near the middle of the antennules and becomes bright again toward the distal end. The posterior corners of the last thoracic segment carry 2 asymmetrical pigment spots. All armature of the A1, caudal chaetae and the exopodites of the swimming legs are also brightly colored. Specimens from great depths (about 2000 m in the Sea of Japan) are even more brightly colored, sometimes completely red. Males are not pigmented and significantly less transparent than C5 stages.