Colored or uncolored. Brain insunk. Frontal organ weak. Mouth opening ventral. Rhabdoids lacking. Ovaries and testes paired. Female accessory organs lacking. Male gonopore shortly in front of the hind end. Copulatory organ consisting of an inner muscular vesicula seminalis and an eversible muscular penis. Antrum masculinum lacking. (citation)[From Dorjes J (1968)]
Notes from synonyms
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