Spermatophore development and sperm ultrastructure inCraterostigmus tasmanianus (Chilopoda,Craterostigmomorpha) |
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| Authors: | Marcella Carcupino Anna Maria Fausto Maria Luisa Bernardino Ortega Marzio Zapparoli Massimo Mazzini |
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| Institution: | (1) Department of Environmental Sciences, University of Tuscia, Via de Lellis, 01100 Viterbo, Italy Fax 391761357179 E-mail carcupin@unitus.it, IT;(2) Department of Environmental Sciences, University of Tuscia, 01100 Viterbo, Italy, IT;(3) Department of Plant Protection, University of Tuscia, 01100 Viterbo, Italy, IT |
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| Abstract: | Spermatophore development and ultrastructure of the mature sperm of Craterostigmus tasmanianus were studied using light and electron microscopy. In C. tasmanianus, as in the Scolopendromorpha, the spermatophore develops within the vas deferens. The latter consists of three parts, each
with a different morphology. The first may be involved in guiding the sperm to roll up into typical ring-like structures,
while the other two, which show an evident secretory activity, secrete the acellular wall of the spermatophores. The ultrastructure
of mature spermatozoa showed that a very close similarity exists between Craterostigmomorpha and Lithobiomorpha, especially
regarding the organization of the connecting piece. Based on this similarity, we consider the Craterostigmomorpha together
with the Scolopendromorpha, Geophilomorpha and Lithobiomorpha (=Pleurostigmophora) to be the sister group of the Scutigeromorpha.
Accepted: 2 June 1996 |
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