Abstract
Molecular sequence data, morphological characters of spermatozoa, and newly obtained morphological characters of penis musculature are used here to revise the systematics of the family Convolutidae (Acoela). Species having isodiametric penes with non-anastomosing longitudinal muscles are transferred to the family Isodiametridae fam. nov. Species with longitudinal penis muscle fibres that anastomose or cross-over each other remain in the Convolutidae. Some species of the genera Convoluta and Conaperta (Convolutidae) are transferred to the genus Isodiametra gen. nov. (Isodiametridae fam. nov.). The genus Stomatricha (Otocelididae) is transferred to the family Convolutidae. Convoluta opisthandropora (Convolutidae) is transferred to the genus Pseudohaplogonaria (Haploposthiidae). Aphanostoma sanguineum (Convolutidae) is transferred to the genus Pseudactinoposthia (Actinoposthiidae). Zusammenfassung Molekulare Sequenzdaten, Spermien-Morphologie und erstmals ermittelte morphologische Merkmale der Penismuskulatur werden herangezogen, um die Verwandtschaftsverhaltnisse innerhalb der Familie Convolutidae (Acoela) neu zu beleuchten. Dabei werden Arten mit isodiametrischen Penes mit nicht anastomosierender Langsmuskulatur in die neue Familie Isodiametridae gestellt, wahrend Arten mit longitudinalen Penis-Muskelfasern, die sich verbunden oder einanderuberkreuzen, innerhalb der Convolutidae belassen. Einige Arten der Gattungen Convoluta und Conaperta (Convolutidae) werden in die neue Gattung Isodiametra gen. nov. (Isodametridae fam. nov.) gestellt. Die Gattung Stomatricha (Otocelididae) wird in die Familie Convolutidae uberfuhrt. Convoluta opisthandropora (Convolutidae) wird in die Gattung Pseudohaplogonaria (Haploposthiidae) gestellt und Aphanostoma sanguineum (Convolutidae) in die Gattung Pseudactinoposthia (Actinoposthiidae).
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