Hermophrodite dating real sex
Hermaphroditism, or the presence of male and female reproductive functions in the same individual, is relatively common in several lineages of teleost fishes (Atz 1964).
Conclusive evidence of functional hermaphroditism has been presented for 94 genera within 27 families and 7 orders, or approximately 6% of teleost families, and there is inconclusive evidence for an additional 31 genera representing 21 families and 6 orders (Sadovy de Mitcheson and Liu 2008).
Research from the University of Pittsburgh published in the Nov.
20 edition of the journal Heredity could finally provide evidence of the first stages of the evolution of separate sexes, a theory that holds that males and females developed from hermaphroditic ancestors.
These early stages are not completely understood because the majority of animal species developed into the arguably less titillating separate-sex state too long ago for scientists to observe the transition.Hermaphroditism can take on a diverse array of forms both within and among various lineages of teleosts, including simultaneous hermaphroditism, protogyny, protandry, bidirectional sex change, and androdioecy (Munday et al. Moreover, at least one androdioecious species, , is known to self-fertilize (Harrington 1961).Taken within a broad phylogenetic context, the patchy distribution of various forms of hermaphroditism across a wide range of taxa indicates that this mode of sex determination is evolutionarily labile and has evolved repeatedly and independently among, and within, several groups of fishes (Smith 1975).Examinations of several families of fishes with adequate data on phylogeny, patterns of sex allocation, mating systems, and with some form of hermaphroditism reveal that the evolution and expression of protogyny and other forms of sex allocation show little evidence of phylogenetic inertia within specific lineages but rather are associated with particular mating systems in accordance with prevalent theories about sex allocation.Transformations from protogyny to gonochorism in groupers (Epinephelidae), seabasses (Serranidae), and wrasses and parrotfishes (Labridae) are associated with equivalent transformations in the structure of mating groups from spawning of pairs to group spawning and related increases in sperm competition.