Type Westblad E 1946 (citation)- New genus and new species. p 17 describes genus differs from Aphanostoma in having no bursa or clumps of sperm by bursa seminalis. Also, lacks any vagina, etc. p 43 illustration. from snady mud 15-20 meters. Westblad E 1948 (citation)- p 32 illustration of sperm in. p 39 illustration of penis. Marcus E 1952 (citation)- mentions this as only species of genus to this time and compares it with his new species P. divae. p 14, 104. Dorjes J 1968 (citation)- notes this species hard to place in Westblad's system. pore may be terminal or ventral p 66. lists p 88 as type. Dorjes J, Karling TG 1975 (citation)- Swedish Museum of Natural History. "evidently closely related to P. pelophilum. Figure 31 male parts.
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