Original Article

Zoomorphology

, Volume 126, Issue 1, pp 53-59

The sperm structure of Embioptera (Insecta) and phylogenetic considerations

  • Romano DallaiAffiliated withDepartment of Evolutionary Biology, University of Siena Email author 
  • , Ryuichiro MachidaAffiliated withSugadaira Montane Research Center, University of Tsukuba
  • , Yoshie JintsuAffiliated withSugadaira Montane Research Center, University of Tsukuba
  • , Francesco FratiAffiliated withDepartment of Evolutionary Biology, University of Siena
  • , Pietro LupettiAffiliated withDepartment of Evolutionary Biology, University of Siena

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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.

Keywords

Ultrastructure Spermatozoa Insect phylogeny Polyneoptera