Polydesmus progressus

Polydesmus progressus is a species of flat-backed millipede in the family Polydesmidae. This species is found in France, usually in caves. This millipede exhibits sexual dimorphism in segment number: Whereas adult females of this species feature the 20 segments (counting the collum as the first segment and the telson as the last) usually observed on the order Polydesmida, the adult males feature only 19 segments.

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