Appearance
Males range from 14.5–20.5 mm in length and 1.5 to 2.7 mm wide while females are somewhat larger ranging from 16.5–27.5 mm long, and 1.6–3.2 mm wide. "O. coarctata" can be distinguished from "Oxidus gracilis", another widely introduced Asian millipede, by having proportionally longer and pointier paranota on mid-body segments and longer gonopods."O. coarctata" is unique within the genus "Orthomorpha" in that the gonopods have a single, simple tip, while other species have two or three lobes. This distinction has led some authors to place "O. coarctata" in a separate, monotypic genus, "Asiomorpha".
Orthomorpha coarctata ZooKeys-131-001-g004.jpg|Anatomy of an individual collected in Thailand
Orthomorpha coarctata ZooKeys-131-001-g007.jpg|Anatomy of male and female
Orthomorpha coarctata gonopods ZooKeys-131-001-g005.jpg|Gonopods
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