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Biological notes on immature stages of Hydaticus pacificus conspersus (Coleoptera: Dytiscidae)

Published online by Cambridge University Press:  28 March 2022

Kohei Watanabe Open the ORCID record for Kohei Watanabe [Opens in a new window] ,
Ryota Saiki ,
Masataka Suda  and
Wataru Yoshida
Kohei Watanabe*
Affiliation:
Ishikawa Insect Museum, Inu–3, Yawata-machi, Hakusan-shi, Ishikawa, 920-2113Japan
Ryota Saiki
Affiliation:
Ishikawa Insect Museum, Inu–3, Yawata-machi, Hakusan-shi, Ishikawa, 920-2113Japan
Masataka Suda
Affiliation:
Ishikawa Insect Museum, Inu–3, Yawata-machi, Hakusan-shi, Ishikawa, 920-2113Japan
Wataru Yoshida
Affiliation:
Ishikawa Insect Museum, Inu–3, Yawata-machi, Hakusan-shi, Ishikawa, 920-2113Japan
*
*Corresponding author. Email: koutarouhigasi@yahoo.co.jp
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Abstract

Hydaticus pacificus conspersus Régimbart, 1899 (Coleoptera: Dytiscidae), is currently considered “endangered,” according to the national Red List of Japan. Herein, the developmental period of the immature stages of H. pacificus conspersus during laboratory rearing is described in detail for the first time. We found that this species deposits eggs not only on aquatic plants but also on the surface of driftwood. The observed durations of developmental stages were as follows: egg period – 3 days; first instar – 1–2 days (1.7 ± 0.5); second instar – 1–4 days (2.4 ± 0.6); third instar – 4–7 days (5.0 ± 0.7 days); and construction of a pupal chamber to emergence: 8–13 days (9.6 ± 0.8). Based on these observed results, H. pacificus conspersus has one of the shortest larval developmental periods among the Dytiscidae species. The short larval period and the ability to lay eggs on substrates other than plants may be an adaption of the species to increase reproductive success in unstable environments.

Type
Scientific Note
Information
The Canadian Entomologist , Volume 154 , Issue 1 , 2022 , e19
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of the Entomological Society of Canada

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Footnotes

Subject editor: Andrew Smith

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