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A new sand diver Trichonotus somaliensis n. sp. (Trichonotidae) is described on the basis of 13 specimens collected off the coast of Somalia at a depth of 38−78m. The new species is most similar to T. arabicus and T. cyclograptus in lacking elongated anterior dorsal-fin spines and having dark markings on the lateral body surface in males. However, the new species differs from the others in having the following characters: lateral-line scales 54−57; gill rakers on first arch 5−6+18−24; 12–14 blotches on upper half of body in both sexes; first dorsal-fin soft ray length in males 19–28% of standard length; and no free dorsal pterygiophores. Trichonotus cyclograptus, a poorly known species, is redescribed on the basis of the newly-designated lectotype and paralectotypes.

A new species of Trichonotus (Perciformes: Trichonotidae) from Somalia and redescription of Trichonotus cyclograptus (Alcock, 1890) with designation of a lectotype