Hermaphroditism has been widely reported in the Crustacea, but protogyny, which females change to males, is apparently rare and restricted peracarid orders Isopoda Tanaidacea. In latter, protogyny demonstrated only seven species representing six genera by rearing experiments indicated for several other through morphology. Here, we show experiment histological observations, protogynous hermaphro...

Crustaceans have diversified sexual systems, incorporating various reproductive modalities such as gonochorism and a wide variety of hermaphroditism. In particular, the coral reef- dwelling caridean shrimps, living in symbiosis with other marine invertebrates, developed unusual systems that given origin to range social including highly advanced eusociality. Protandric hermaphroditism, common am...

Surveys of plant breeding systems in angiosperm families have shown a significant association between monoecy and dioecy, and researchers have proposed that dioecy has tended to evolve from monoecy. We evaluated this hypothesis in the context of a phylogeny of 918 monocotyledons assembled from 19 published trees. Binary and multistate breeding system characters were mapped onto a set of composi...

months old, was brought to me foe examination. The mother informed me that the child hac never passed a stool since its birth and that there was s?mething wrong about its "-enitals ; in short, she could not tell whether the infant was a male or female. The child's aidomen was very much swollen, and its limbs by contrast looted very thin indeed. I examined the cleft of the nates, aid found that ...

Interpretations of hermaphroditism have been influenced by the old idea that organisms can be arranged in a series from lower to higher, with human beings at the top, leading toward the angels and God (the scala naturae). The consequent notion that hermaphroditism is a primitive condition is still with us. Such issues need to be addressed empirically, in a phylogenetic context. Darwin's theory ...

A high incidence of 46,XX true hermaphroditism exists among southern African blacks. The gonadal distribution and clinical presentation of 38 patients are described. The aim of our study on 11 families with histologically proven XX true hermaphroditism was to determine whether a common genetic or environmental etiology could be identified. Pedigree analysis excluded the presence of a simple inh...