Paracheilinus mccoskeri
Encyclopedia
Paracheilinus mccoskeri is a Wrasse
Wrasse
The wrasses are a family, Labridae, of marine fish, many of which are brightly colored. The family is large and diverse, with over 600 species in 82 genera, which are divided into nine subgroups or tribes....

 from the Indo-West Pacific. It occasionally makes its way into the aquarium trade. It grows to a size of 8 cm in length.
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