The Female Reproductive System

    The reproductive tract of the female/hermaphrodite is essentially a tube filled with maturing eggs. Depending on the species there may be one tube (a single gonad) (A, B) or there may be two tubes (a pair of gonads); these systems are respectively called monodelphic and didelphic. The reproductive tracts may be outstretched (A), reflexed (B, C) or coiled (D). Tracts that are prodelphic are anteriorly directed (A,B, D), whereas didephic systems may be amphidelphic, having tracts in opposing directions. Often monodelphic systems have a postvulvar sac, a small chamber extending opposite to the gonad and posterior to the vulva opening (A). 
 

Fig. 5. Basic orientation of female/hermaphrodite reproductive tract. A. Monodelphic (one gonad) and prodelphic (anteriorly directed) with a postvulvar sac.  B.  Monodelphic, prodelphic and reflexed.  C.  Amphidelphic (outstretched in anterior and posterior direction).  D. Didelphic, prodelphic and coiled.