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Chamaesomatidae is a family of belonging to the order Chordeumatida. This family contains 28 species distributed among 11 Genus. These millipedes are found in Europe and North Africa.
Adult males in this family feature anterior Gonopod derived from the eighth leg pair and posterior gonopods derived from the ninth leg pair. The anterior gonopods each include a basal element, the angiocoxite, which is derived from the base (Arthropod leg) of the eighth leg pair, and a distal element located toward the side and the rear, the telopodite, which is usually well developed, as well as another structure toward the rear, the colpocoxite, which some authorities believe to be permanently extruded and Sclerotin walls of the coxal gland. The anterior gonopods sometimes feature flagella. The posterior gonopods each feature a telepodite with either one or two segments. The eleventh pair of legs in adult males usually feature coxal hooks.
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