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The two vibrantly colored fish in this reef habitat are Lyretail Anthias (Pseudanthias squamipinnis). In my decades of observing… The two vibrantly colored fish in this reef habitat are Lyretail Anthias (Pseudanthias squamipinnis). In my decades of observing marine life, I have been particularly fascinated by the dazzling colors and social behaviors of this species. These fish are a common sight in the Indo-Pacific, where they form large, bustling schools in the water column just above the reef. Lyretail Anthias are known for their striking orange-to-yellow coloration and their sexually dimorphic appearance; males are often a deeper reddish-orange and possess an elongated, lyre-shaped tail fin. They are protogynous hermaphrodites, meaning they all mature as females, and when the dominant male dies, the largest female in the group will change sex to become the new male. This remarkable social structure and their constant, graceful movement make them a vital and beautiful part of any reef ecosystem.