21. The genus has been studied with interest due to its unusual sexual system, protandric simultaneous hermaphroditism . 22. These areas include an all-male society, promiscuity, monastic celibacy, hermaphroditism , and bisexuality. 23. Simpson's intellectual interests ranged from archaeology to an almost taboo subject at the time : hermaphroditism . 24. With this prediction one would assume that hermaphroditism is very common, but this is not the case. 25. This indicates that the cost of sex change does not explain the rarity of sequential hermaphroditism by itself. 26. This example of hermaphroditism ( a bilateral gynandromorph ) is one of very few known for elasmobranch fishes. 27. His doctoral thesis on hermaphroditism , published in 1972, is considered the authoritative work on the subject. 28. There is evidence for at least 133 transitions between dioecy and hermaphroditism in the sexual systems of bryophytes. 29. Although similar in some ways to true hermaphroditism , the conditions can be distinguished histologically and by karyotyping. 30. Ghiselin proposed three models for hermaphroditism in 1969 in his paper titled The evolution of hermaphroditism among animals .
