Systematics of the Copidosomatini: polyembryonic parasites (Hymenoptera: Encyrtidae) /
Copidosomatini, a tribe within Encyrtidae, is comprised of 12
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=742164591&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Copidosomatini, a tribe within Encyrtidae, is comprised of 12 genera in the subtribes Coelopencyrtina, Parablastottichina, Ageniaspidina, and Copidosomatina. Species in this tribe are polyembryonic and utilize non-butterfly Lepidoptera and aculeate Hymenoptera as hosts. Phylogenetic analysis using parsimony methods and successive approximations was used to analyze a data matrix of 47 characters and 67 taxa. A number of new characters and characters used in identification were evaluated for their phylogenetic utility. Many were found to be homoplastic but several proved to be very informative. Characters were analyzed using the full dataset, a reduced number of taxa, a reduced number of characters and a reduced number of characters and taxa. Reducing the number of taxa had the least effect and reducing the number of taxa and characters simultaneously had the strongest effect compared to results using the full dataset. Apsilophrys De Santis, Paralitonuutix Mercet, and Raffaellia Girault were found to be phylogenetically indistinguishable from species of Copidosoma and are synonymized with it. Three subtribes are monophyletic and the fourth, Coelopencyrtina, although appealing to be paraphyletic is retained as an entity in the tribe. The subtribes show distinct differences in biologies. Species of Coelopencyrtina parasitize aculeate Hymenoptera but have not been conclusively demonstrated to be polyembryonic. Members of the other subuibes attack Lepidoptera, but polyembryony has been demonstrated only in Ageniaspidina and Copidosomatina. Congruence between the phylogenies of ParablastothTichina, Ageniaspidina, and Copidosomatina and that of Lepidoptera suggests that ancestral copidosomatines utilized leaf-mining monotrysian Lepidoptera as hosts. While species of Parablastothrichina and two genera within Ageniaspidina continue to parasitize plesiomorphic Lepidoptera, members of Ageniaspis and Copidosomatina have expanded their host ranges to more derived families of lzpidoptera. Reports of polyembryony in two other species from two genera unrelated to Copidosomadni would indicate the multiple evolution of this trait in Encyrddae. A key to the 57 Nearctic species of Copidosoma is provided, along with descriptions of 35 new and redescriptions of 13 species. Host and distribution information are given, and new combinations and new synonymies for genera and species are proposed. |
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| Item Description: | Vita. "Major Subject: Entomology". |
| Physical Description: | vi, 306 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references. |