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Anatomical impact and notes on viviparous development related to infestation by neotenic females of Stylops advarians (Strepsiptera: Stylopidae) on adult female Andrena milwaukeensis (Hymenoptera: Andrenidae)

Published online by Cambridge University Press:  31 May 2021

Zachary S. Balzer  and
Arthur R. Davis Open the ORCID record for Arthur R. Davis [Opens in a new window]
Zachary S. Balzer
Affiliation:
Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, Saskatchewan, S7N 5E2, Canada Department of Biology, Western University, London, Ontario, N6A 5B7, Canada
Arthur R. Davis*
Affiliation:
Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, Saskatchewan, S7N 5E2, Canada
*
*Corresponding author. Email: [email protected]
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Abstract

Stylops advarians Pierce (Strepsiptera: Stylopidae) is a prevalent parasite of adult Andrena milwaukeensis Graenicher (Hymenoptera: Andrenidae) in Saskatoon, Saskatchewan, Canada. By dissecting adult bees and examining histological sections, we sought to determine how neotenic females of S. advarians impact female hosts of A. milwaukeensis anatomically. Adult bees with 1–3 females of S. advarians within their gasters were compared to nonstylopised bees (control). The presence of a single female parasite inhibited development of the host’s ovaries. The bee’s foregut shifted laterally when one parasite occupied the gaster and ventrally when two or three were present, thereby reducing the crop’s expandable capacity and the amount of nectar and pollen that stylopised bees can ingest. The midgut and hindgut were less significantly affected by stylopisation. Female parasites typically occupied the host’s gaster dorsolaterally, where each was supported by one of the host’s air sacs. If a third female parasite was present, she resided dorsally along the midline of the host’s gaster, mostly supported by the two female parasites to either side. Asynchronous development within neotenic female parasites was demonstrated, wherein mature first-instar larvae occupied the cephalothorax and abdomen at the same time that the adult female was still supporting multiple embryos.

Type
Research Papers
Information
The Canadian Entomologist , Volume 153 , Issue 4 , August 2021 , pp. 500 - 510
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Entomological Society of Canada

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Footnotes

Subject editor: Shelley Hoover

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