Doe DA, Rieger RM 1977 (citation)- description and illustration of new species p 549-556. Rieger RM 1978 (citation)- on ciliary structures of, in spermatozoa, discussion of phylogenetic significance of, structures unique to Catenulida. Rieger RM 1981 (citation)- electron microscopy work on p 216. Doe DA 1981 (citation)- electron microscopy work on pharynx of.
Schuchert P, Rieger RM 1990 (citation)- "Ultrastructural examination of spermatogenesis in Retronectes atypica (Catenulida, Platyhelminthes)."
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