Abstract
The polytene chromosomes, larva, pupa, and male are described for the black fly Simulium chaouikaidi n. sp., a member of the Simulium venustum group from Morocco. Chromosomally, this new species is one fixed inversion removed from the standard banding sequence for the subgenus Simulium and has microscopically undifferentiated sex chromosomes and minimal autosomal polymorphism. It is homosequential with two other species in the S. venustum species group: S. bergi Rubtsov and S. paramorsitans Rubtsov. Structurally, each known life stage of the new species is distinct from that of all other simuliids in North Africa. This new species is the southernmost member of the S. venustum group in the Old World and is apparently endemic to the Rif Mountains. Its restricted distribution includes Bou Hachem Natural Park where its habitat is afforded some protection.
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