The sperm structure of Embioptera (Insecta) and phylogenetic considerations |
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Authors: | Romano Dallai Ryuichiro Machida Yoshie Jintsu Francesco Frati Pietro Lupetti |
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Institution: | (1) Department of Evolutionary Biology, University of Siena, Via A. Moro 2, 53100 Siena, Italy;(2) Sugadaira Montane Research Center, University of Tsukuba, Ueda, Nagano, Japan |
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Abstract: | The sperm structure of two species of Embioptera, Embia savignyi Westwood 1837 and Aposthonia japonica (Okajima 1926), was studied. Spermatozoa of both species exhibit a monolayered acrosome and a layer of material surrounding
the sperm cells for most of their length. The presence of a 9+9+2 axoneme provided with accessory microtubules with 16 protofilaments,
two accessory bodies and two crystallized mitochondrial derivatives are characters shared with other polyneopteran taxa. The
supposed close relationship between Embioptera and Phasmatodea is not supported by characters of the sperm ultrastructure. |
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Keywords: | Ultrastructure Spermatozoa Insect phylogeny Polyneoptera |
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