What striking physical feature defines the massive Asian Sheepshead Wrasse (*Cheilinus undulatus*)?
Answer
A prominent, fleshy hump on its forehead (nuchal hump)
The Asian Sheepshead Wrasse, also known as the Humphead Wrasse, exhibits a physical specialization directly related to its impressive size and maturity. Its most striking and namesake feature is the presence of a prominent, fleshy hump located on its forehead. This structure is termed the nuchal hump. As the fish ages and grows larger, this feature becomes increasingly pronounced. This physical marker, alongside its thick, fleshy lips and large scales, contributes to its rugged appearance and distinguishes it from smaller, sleeker reef wrasses.
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