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The genus    Bagnallella    Salmon is restored and given a diagnosis. It takes an intermediate position between    Proisotoma    Börner and    Cryptopygus    Willem complexes and is characterized by the separation of the two last abdominal segments (like in    Proisotoma   ) and 3 and 5  s-chaetae  on the fourth and fifth abdominal segments (like in    Cryptopygus    and its allies). A list of and key to species belonging to    Bagnallella    is given.    Bagnallella   biseta    comb. nov. ,    B.   dubia    comb. nov. ,    B.   sedecimoculata    comb. nov. , and    B.   tenella    comb. nov.  are commented and redescribed. Morphology of    Bagnallella   davidi    (Barra),  comb. nov.  is described from the specimens from South Africa. So far    B.   davidi    appears to be a complex of forms differing in size of the furca and macrochaetae. Two types of strongly modified males were found and described. Antennae, ventral side of abdomen, posterior edge of abdominal tergites, and mandibles are affected with epitoky. The nature of the discovered strong polymorphism is unclear.

zookeys

Taxonomy of the    Proisotoma    complex. VI. Rediscovery of the genus    Bagnallella    Salmon, 1951 and epitoky in    Bagnallella   davidi    (Barra, 2001), comb. nov. from South Africa