Abstract
The spiracles of scolopendromorph centipedes have long been a source of systematic characters based on their segmental distribution and gross morphology, but microscopic investigations to date have documented only a small number of species. A scanning electron microscopic survey of 34 species that samples the major groups of Scolopendromorpha reveals variability in such features as the structure of the peritremal margin, specific kinds of sensilla and glandular pores on the peritrema, projections on the valves that subdivide the atrium (in Scolopendrinae), and the form of the trichomes around the tracheal openings. Adding new characters from the spiracles to recent morphological datasets for phylogenetic inference reinforces the monophyly of major groups of Scolopendridae and is particularly informative for relationships within Scolopendrini. A bowl-like atrium with the tracheae opening between humps in its floor is more widespread in Scolopendromorpha than previously reported. Shared presence of spiracle muscles in Cryptopidae and Scolopendrinae may reflect convergent evolution of a subatrial cavity in these groups rather than being an apomorphic character for Scolopendromorpha as a whole.
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Acknowledgments
V.V.’s work was funded by the Academy of Finland. Most imaging in this work was supported by internal curatorial funds at the MCZ and performed at the Center for Nanoscale Systems (CNS, Harvard University), a member of the National Nanotechnology Infrastructure Network (NNIN), which is funded by the National Science Foundation under NSF award no. ECS-0335765. Adam Graham and Dave Lange at CNS and Aodhan Butler (then at The Natural History Museum) assisted with the scanning electron microscopy. Lorenzo Prendini and Jeremy Huff kindly lent the AMNH specimens for the study. For provision of specimens collected by them, we thank Henrik Enghoff, Zoltan Korsós, Geoff Monteith, Pedro Oromí, William A. Shear and Pavel Stoev. Carsten Müller kindly advised us on glands. Suggestions by the journal’s referees improved the paper.
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Communicated by A. Schmidt-Rhaesa.
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Vahtera, V., Edgecombe, G.D. & Giribet, G. Spiracle structure in scolopendromorph centipedes (Chilopoda: Scolopendromorpha) and its contribution to phylogenetics. Zoomorphology 131, 225–248 (2012). https://doi.org/10.1007/s00435-012-0157-0
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DOI: https://doi.org/10.1007/s00435-012-0157-0