Stefani, Phytochemical study and chemotaxonomic investigation of species of Dimerostemma genus (Asteraceae, Heliantheae) and the use of microsampling of
glandule trichomes, Sciences and Letters, University of Sao Paulo, Sao Paulo, Brazil, 2002.
Each oyster gonad was ascribed to 1 of the 5 maturation degrees established and described as follows: NO, empty gonad; EA, early gonad activity, white ramifications in the gonad; BF, gonad begins to fill, digestive
glandule perfectly seen; PD, gonad poorly developed, digestive
glandule partially seen; D, gonad developed, perfectly covers digestive gland; and TD, gonad totally developed, stands voluminously.