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(NATURAL HISTORY) ,-;c? The baculum in the Vespertilioninae (Chiroptera: Vespertilionidae) with a systematic review, a synopsis of Pipistrellus and Eptesicus, and the descriptions of a new genus and subgenus J. E. Hill Department of Zoology, British Museum (Natural History), Cromwell Road, London SW7 5BD D. L. Harrison Harrison Zoological Museum, Bowerwood House, St Botolph's Road, Sevenoaks, Kent TN133AL Contents Synopsis Introduction Functional and systematic significance of the baculum Nature and scope of this study Materials and methods Authorship and responsibility The baculum of Pipistrellus The baculum of Eptesicus The baculum in other Vespertilioninae Systematic considerations ..... Genus Pipistrellus Kaup, 1829 Genus Eptesicus Rafi nesque, 1 820 The status of the 'Nycticeini'. The classification of the Vespertilioninae Zoogeographical considerations Conclusions Addendum References Appendix 1 . Specimens examined Tables 1-3 Figures 1-22 Synopsis Current classification of the Vespertilioninae rests chiefly on a suite of mainly adaptive characters, among which facial shortening throughout the subfamily with consequent changes in the structure, size, relative position and number of the incisive and premolar teeth features prominently. Such characters may not necessarily reflect relationships or phyletic diversity, and sometimes do not serve properly to distinguish the genera that they purport to define, as in the distinction of Pipistrellus and Eptesicus, where generic boundaries remain unclear. The search for possibly less strongly adaptive features suggested the possibility that the morphology of the os penis or baculum might prove valuable in the study of the systematics of these genera and perhaps in the subfamily as a whole. This paper reviews earlier studies of the baculum in the Chiroptera and their relevance to systematics in the Order, with an examination of its gross morphology throughout the Vespertilioninae, especial attention being given to species currently allocated either to Pipistrellus or to Eptesicus. A synoptic review of the species Bull. Br. Mus. nat. Hist. (Zool.) 52 (7): 225-305 Issued 30 July 1987 225

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The baculum in the Vespertilioninae (Chiroptera: Vespertilionidae) with a systematic review, a synopsis of Pipistrellus and Eptesicus, and the descriptions of a new genus and subgenus

J E Hill and D L Harrison
Bulletin of the British Museum (Natural History) Zoology 52(7): 225-305 (1987)

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