Both ontogeny and sexual dimorphism of the Ostracoda are important for understanding their evolution. The purpose of this study is to evaluate the ontogeny and possible sexual dimorphism of the ostracode species Paraparchites punctatus n. sp. by assessing size, shape, and ornamentation at the stages of its growth for which we were able to obtain specimens: adults and five or six instars. Brooks's rule suggests that with each molt crustaceans double their volume (Brooks, 1886; Teissier, 1960; see also Przibram, 1931). The degree of adherence to Brooks's rule during ontogeny bears on the importance of heterochrony...

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