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Zoomorphology

, Volume 134, Issue 1, pp 79–91 | Cite as

The intermediate sperm type and genitalia of Zorotypus shannoni Gurney: evidence supporting infraordinal lineages in Zoraptera (Insecta)

  • Romano Dallai
  • Marco Gottardo
  • David Mercati
  • José Albertino Rafael
  • Ryuichiro Machida
  • Yuta Mashimo
  • Yoko Matsumura
  • Rolf Georg Beutel
Original Paper

Abstract

The sperm ultrastructure and the male and female genital apparatus of Zorotypus shannoni were examined and documented in detail, mainly using transmission electron microscopy micrographs. The findings suggest an evolutionary trend shared with Z. hubbardi and Z. impolitus. The three species are characterized by enlarged mitochondrial derivatives and related modifications. Giant sperm are probably a synapomorphy of Z. hubbardi and Z. impolitus, whereas an intermediate condition of this feature is found in Z. shannoni. The monophyletic origin of Z. caudelli, Z. magnicaudelli, Z. huxleyi and Z. weidneri is suggested by characteristically modified axonemes. The presence of extra-acrosomal material is also an unusual feature for Zoraptera, but this condition also occurs in the majority of polyneopteran groups. The long and convoluted female spermathecal duct with secretory and duct-forming cells is a constant feature in Zoraptera. The enlarged seminal receptacle suggests an evolutionary link between the male genital structures and the sperm size on one hand, and the size of the female spermatheca on the other. The small and otherwise uniform group Zoraptera exhibits a remarkable variation of sperm types and genital structures, suggesting the impact of different types of selection. It is likely that cryptic female choice plays a major role in shaping the genital apparatus.

Keywords

Polyneoptera Spermatozoa Ultrastructure Transmission electron microscopy (TEM) Phylogeny 

Notes

Acknowledgments

We thank J. T. Câmera and F. F. Xavier Filho for their help in collecting material. YM was supported by JSP Postdoctoral Fellowships for research abroad.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Romano Dallai
    • 1
  • Marco Gottardo
    • 1
  • David Mercati
    • 1
  • José Albertino Rafael
    • 2
  • Ryuichiro Machida
    • 3
  • Yuta Mashimo
    • 3
  • Yoko Matsumura
    • 4
  • Rolf Georg Beutel
    • 4
  1. 1.Department of Life SciencesUniversity of SienaSienaItaly
  2. 2.Instituto Nacional de Pesquisas da AmazoniaManausBrazil
  3. 3.Sugadaira Montane Research CenterUniversity of TsukubaNaganoJapan
  4. 4.Entomology Group, Institut für Spezielle Zoologie und Evolutionsbiologie mit Phyletischem MuseumFriedrich-Schiller-Universität JenaJenaGermany

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