Abstract
Three specimens of a distinctive new species of congrogadin belonging to the basal lineage (Rusichthys) of the subfamily are reported here. The new species differs from its congener in having more dorsal-fin and anal-fin rays and more gill rakers on the outer surface of the first gill arch, in colour pattern, and in various osteological details (especially of the caudal skeleton). Rusichthys explicitus n.sp. is presently known from a single collection taken from 27 m off southwest Oman, whereas R. plesiomorphus is presently known from two specimens trawled in 140 m on the Lamu Banks off northern Kenya.
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