Marcus E 1952 (citation)- describes this species- unique character is the occurrence of 2 types of sperm: (1) "eupirenos" [true sperm], and (2) "apirenos" [without nuclei?] filiform without chromatin. (rather rare due to some sperm on viable) p 15-17, 104. Marcus E 1953 (citation)- comment on muscle layers p 12. Ax P 1961 (citation)- notes epithelial nervous system in Dorjes J 1968 (citation)- sets up this genus for Marcus species. Dorjes J, Karling TG 1975 (citation)- Swedish Museum of Natural History, Brazil. Ehlers U, Doerjes J 1979 (citation)- comparisons p 30.
Notes from synonyms
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