A new Egyptian species ofChuniodrilus(Eudrilidae, Oligochaeta) with observations on internal fertilization and parallelism with the genusStuhlmannia

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Abstract
A new Egyptian species of the pareudriline genus Chuniodrilus is described and the generic definition emended to include it. A key to the six species of the genus diagnoses the new species. Evidence is presented which indicates that evolution of the female genital system for internal fertilization has closely paralleled that in the genus Stuhlmannia, including encapsulation of the ovaries in the oviducal system, provision for sperm storage within this system, union of the systems of the two sides, and reduction of the ovisac of one side (the right in Chuniodrilus, the left in Stuhlmannia). The ultimate condition, loss of the right oviduct, is seen in Scolecillus tantillus which is probably congeneric with Chuniodrilus, and corresponds with the condition in Stuhlmannia asymmetrica in which the left oviducal system has been eliminated.