Comparative spermatology of four species of strepsiptera and comparison with a species of primitive coleoptera (Rhipiphoridae) |
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| Institution: | 1. Department of Zoology, South Parks Road, Oxford OXI 3PS, U.K.;2. Dipartimento di Scienze Ambientali, Via S. Camillo de Lellis, 01100 Viterbo, Italy;1. Tübingen Structural Microscopy Core Facility, Center for Applied Geoscience, Eberhard-Karls-University Tübingen, Schnarrenbergstrasse 94-96, 72076 Tübingen, Germany;2. Advanced Light and Electron Microscopy (ZBS 4), Robert Koch-Institut, Seestr. 10, 13353 Berlin, Germany;3. Zoological Institute and Museum, Department of General and Systematic Zoology, University of Greifswald, Loitzer Str. 26, 17489 Greifswald, Germany;4. Department of Psychology and Neuroscience, Life Sciences Centre, Dalhousie University, Halifax, NS, Canada B3H 4R2;5. Entomology Group, Institut für Zoologie und Evolutionsforschung, Friedrich-Schiller-Universität Jena, Erbertstraße 1, 07743 Jena, Germany;1. Department of Physics, University of Calabria, Via Bucci, 87036 Arcavacata di Rende, Cosenza, Italy;2. Istituto Nazionale di Fisica Nucleare, Division of Frascati, Via Fermi, 54, 00044 Frascati, Rome, Italy;3. Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163,5 in AREA Science Park, 34149 Basovizza, Trieste, Italy;4. Department of Biology, Ecology and Earth Science, University of Calabria, Via Bucci, 87036 Arcavacata di Rende, Cosenza, Italy |
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| Abstract: | The comparative spermatology of 4 strepsipteran species, namely, Xenos moutoni De Buysson, Elenchus tenuicornis (Kirby), Elenchus japonicus Esaki and Hashimoto and Halictophagus chilensis Hofmann, have been studied by transmission electron microscopy. The spermatozoon of all 4 species examined were seen to have: an elongated head characterized by a nucleus with an internal channel of uncondensed chromatin, a one-layered acrosome, and a tail containing a 9 + 9 + 2 axoneme and 2 partially crystallized mitochondrial derivatives. Each sperm, nevertheless, shows a few peculiarities that confirm the taxonomic value of comparative spermatology. In addition, the strepsipteran spermatozoa were seen to have a different organization to that of Pelecotoma fennica Pewkull (Rhipiphoridae, Pelecotominae), which has the typical structure of a coleopteran sperm. It was characterized by a 3-layered acrosomal complex, a tail with a 9 + 9 + 2 axoneme flanked by 2 accessory bodies and 2 mitochondrial derivatives. From the spermatological point of view, primitive Coleoptera cannot be considered to be closely related to Strepsiptera. |
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