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Structure and Distribution of Sensilla on the Mouthpart Palps in Caddisflies of the Family Hydropsychidae (Trichoptera)

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Abstract

A comparative morphological study of the structure and distribution of sensilla on the maxillary and labial palps in caddisflies of the family Hydropsychidae was performed. Morphology of palpal sensilla was studied by scanning electron microscopy in 17 species from 12 genera. The palps of the studied species have four types of sensilla: long trichoid, chaetoid, campaniform, and petaloid; at the same time, no basiconic and pseudoplacoid sensilla were found on the palps. All the studied species lack apical sensory complexes at the tips of both pairs of palps, where only long chaetoid sensilla are present. Petaloid sensilla form sensory fields on the 4th (in Arctopsychinae) or on the 3rd and 4th segments (in Diplectroninae, Hydropsychinae, Macronematinae) of the maxillary palps, but sensilla of this type are never present on the labial palps. The sensory fields include from 5–10 sensilla in Hydropsychinae to 40 sensilla in Arctopsychinae.

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ACKNOWLEDGMENTS

We are sincerely grateful to N.J. Kluge (Department of Entomology, St. Petersburg State University) and Yu.V. Samartseva (Zoological Institute of the Russian Academy of Sciences, St. Petersburg) for the provided material of caddisflies. We also thank our colleagues from the Research Park of St. Petersburg State University for their assistance with using the equipment within the framework of project 109-24431 at the Resource Center for Molecular and Cell Technologies and project 112-28656 at the Resource Center for Microscopy and Microanalysis.

Funding

This work was supported by the Russian Science Foundation (project 22-24-00259).

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Authors and Affiliations

  1. Department of Entomology, St. Petersburg State University, 199034, St. Petersburg, Russia

    V. D. Ivanov, K. T. Abu Diiak, S. I. Melnitsky & M. Yu. Valuyskiy

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  1. V. D. Ivanov
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  2. K. T. Abu Diiak
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  3. S. I. Melnitsky
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  4. M. Yu. Valuyskiy
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Correspondence to V. D. Ivanov.

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Statement on the welfare of animals. All the applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All the procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.

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Ivanov, V.D., Diiak, K.T.A., Melnitsky, S.I. et al. Structure and Distribution of Sensilla on the Mouthpart Palps in Caddisflies of the Family Hydropsychidae (Trichoptera). Entmol. Rev. 103, 53–61 (2023). https://doi.org/10.1134/S0013873823010074

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