Marcus E 1945 (citation)- notes this is characterized by presence of male efferent organs at the extreme anterior end of the prostomium, p 18, 54. Marcus E 1945 (citation)- definition of family: "Cerebrum large, oval, without subdivision into anterior and posterior lobes. The cerebrum is situated nearly at the anterior end of the body and therefore, far from the mouth. A ciliated groove can occur and that, very far anterior to the mouth: male copulatory apparatus developed either in young or adult zooids with more or less complete elements. Excretory ducts are present." 1 Genus, Chordarium.
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