Ehlers U 1992 (citation)- "fine stuctural organizations of the epidermis, of epidermal receptors, of epidermal glands, of the subepidermal channel-like glandular system and of the digestive system of" Paratomella rubra. Phylogenetic system of the Acoelomorpha is presented.
Hooge MD 2001 (citation)- "Evolution of body-wall musculature in the Platyhelminthes (Acoelomorpha, Catenulida, Rhabditophora)."
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