A new North American heterozerconid, Narceoheterozercon ohioensis n. g., n. sp., with first description of immatures of Heterozerconidae (Acari: Mesostigmata)

Narceoheterozercon ohioensis n. g., n. sp., an associate of the millipede Narceus annularis (Rafinesque), is described for all instars. This represents the first description of immatures in the infraorder Heterozerconina. In contrast to the heavily selerotized adults, which have short setae, are hypertrichous, and possess characteristic ventral opisthosomal suckers, the immatures are soft bodied, have long idiosomal setae in a holotrichous pattern, and lack ventral suckers.