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James M. Carpenter, curator of entomology at the American Museum of Natural History in New York, leads me to a sixty-foot-long room in the bowels of the museum. The walls are lined with fifty-four sizeable metal cabinets.

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We examined the sex ratio proportion of males and related life-history traits of adults of the Japanese gall forming thrips Ponticulothrips diospyrosi Haga et Okajima. A few foundresses started a gall in late April, and their progeny developed within the gall. Second generation adult males emerged sooner than females, guarded the female pupae II, and copulated within the gall after adult eclosion.

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The gall wasp Biorhiza pallida Hymenoptera: Cynipidae reproduces by cyclical parthenogenesis. The adults of the sexual generation develop within galls oak apples that contain many larval cells. Folliot [ Annales Des Sciences Naturelles: Zoologie, 12, ] found asexual generation females to be of three reproductive types.

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Skip to search form Skip to main content. Kranz and Thomas W. KranzThomas W.

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The sex ratios of three Mesopolobus species were found to vary in different hosts in a gall-forming community in Berkshire. These relationships were consistent with Charnov's host size—sex ratio hypothesis Charnov Due to the segregation of host species on different species of Quercusit was possible to conduct a geographical variation experiment proposed by Charnov et al.

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Monogeny, the production of unisexual broods by individual females, is widely recorded in gall midges Diptera: Cecidomyiidae. Theoretical models propose that the adjustment of offspring sex ratio by females may pre-dispose the evolution of monogeny in gall midges however empirical studies in this field are superficial. Expressed more simply, monogeny may enable individual female gall midges to decrease or increase the number of male and female progeny they produce in response to changes in environmental conditions.

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Gall waspsalso called gallflies, are a family Cynipidae in the wasp superfamily Cynipoidea within the suborder Apocrita of the order Hymenoptera. Their common name comes from the galls they induce on plants for larval development. Like all Apocritagall wasps have a distinctive body shape, the so-called wasp waist. The first abdominal tergum the propodeum is conjoined with the thoraxwhile the second abdominal segment forms a sort of shaft, the petiole.

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