Bruggemann J 1986 (citation)- "Ultrastructural investigations on the differentiation of genital hard structures
in free-living platyhelminths and their phylogenetic significance". Specimens used from Acoela,
Macrostomida, Typhloplanoida, Kalyptorhynchia, and Dalyellioida:
Philocelis cellata
Paromalostomum fusculum
Paromalostomum proceracauda
Ciliopharyngiella
Adenorhynchus balticus
Promesostoma marmoratum
Promesostoma caligulatum
Promesostoma rostratum
Marirhynchus longasaeta
Provortex psammophilus
Provortex tubiferus
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