Graduate Thesis Or Dissertation
 

A review of the genus Neotrombidium leonardi, 1902, with a description of two new species, and a critical re-evaluation of the family concepts within the Trombidioidea (Acarina)

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  • The systematics and biology of the genus Neotrombidium Leonardi are reviewed and discussed. A generic description is presented for larvae and post-larvae of Neotrombidium, together with descriptions of two new species, N. cleronyssus and N. tenebrionyssus. The biology and life history of N. tenebrionyssus are described, with notes on rearing and host specificity. The adults and larvae of N. tricuspidum Borland, and adults of N. armatum André, elongatum André, and indosinensis André are compared with the newly described species. Neotrombidium gracilipes Womersley is excluded from the genus Neotrombidium, since its affinities lie outside thi s genus. Neotrombidium helladicum Cooreman is tentatively synonymized with N. indosinensis André. A study of the systematic placement of the genus Neotrombidium necessitated a re-evaluation of the familial concepts within the Trombidioidea. It is proposed that the families Trombiculidae Ewing, Leeuwenhoekiidae Womersley, Trombellidae Feider, Peritremotrombidiidae Feider, Stigmotrombidiidae Feider, and Johnston-ianidae Newell be reduced to no more than subfamilial levels, within the inclusive family Trombidiidae Leach. It is also proposed that the superfamily Trombidioidea be composed of the family Trombidiidae and the so-called Hydrachnellae, based on common morphological characteristics.
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