Observations on genital papillae of pycnonotic Brachypylina (Acari: Oribatida)
1991 - Volume: 32 Issue: 1 pages: 71-78
The morphology of genital papillae in adults of representatives of many pycnonotic brachypyline families and genera is analysed. The Oppioidea and Carabodoidea share the apomorphy of anterior genital papillae which are tapered and narrower than the medial and posterior papillae. Adults of Eremellidae and Caleremaeidae, presently included in the Oppioidea, have unmodified anterior genital papillae, indicating that their systematic position in the Brachypylina needs reevaluation. Within the Oppiidae genital papillae are reduced to two pairs, and the posterior genital papillae are very broad, in adults of Aeroppia, Amerioppia, Oppia, and Ramusella. Examination of genital papillae in immature instars of Ramusella maculata (Hammer) and Oppia nitens (C. L. Koch) indicates that reduction in number of genital papillae is first expressed in the adult, and that enlarged posterior genital papillae can be expressed in an earlier instar than the adult. The ontogenetic sequence of expression of genital papillae in O. nitens is hypothesized to be in a postero-anterior direction.
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