Biology of the Small Diving Beetle Laccophilus yoshitomii Watanabe and Kamite, 2018 (Coleoptera: Dytiscidae) and Rearing Methods

Watanabe, Kohei

doi:10.1649/0010-065x-75.1.88

Cited by 11 publications

(7 citation statements)

References 6 publications

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“…To examine the immature stages and life history of smaller species, rearing‐based methods are better suited than field studies. The Laccophilus rearing method was introduced by Watanabe (2021a), and several species have been successfully reared and reproduced with this method (Watanabe 2020, 2021b; Watanabe & Kamite 2020). The rearing‐based method is suitable for a comparison between closely related species, because it is possible to rear target species under the same environmental conditions.…”

Section: Figurementioning

confidence: 99%

“…They were brought to a rearing room maintained at 26°C under conditions of 9 h light (8:15 a.m. to 5:15 p.m., Japan Standard Time) and 15 h dark (LD 9:15) in the Ishikawa Insect Museum (Hakusan, Japan) on October 21, 2020. The rearing method of Watanabe (2021a) was followed, and after more than 2 months, they did not lay eggs; therefore, the egg‐laying substrate was changed to Ludwigia sp., on December 28, 2020. Photographs were captured using a Nikon D500 digital camera, equipped with a Laowa 25 mm f/2.8 2.5–5× Ultra Macro lens.…”

Section: Figurementioning

confidence: 99%

“…c–e: P < 0.05; other combinations: P < 0.0001. L. vagelineatus (LV), L. yoshitomii (LY), L. kobensis (LK) and L. hebusuensis (LH) used datasets reported by Watanabe (2020, 2021a,b) and Watanabe & Kamite (2020). LL, L. lewisioides .…”

Section: Figurementioning

confidence: 99%

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Life history of Laccophilus lewisioides Brancucci, 1983 (Coleoptera: Dytiscidae) and the ecological significance of the larval period of five Laccophilus species

Watanabe

2022

Entomological Science

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Dytiscidae are the largest aquatic group belonging to the order Coleoptera. However, approximately 40% of Dytiscidae members have been threatened with extinction in Japan, and Laccophilus is one of the genera with considerable decline. A description of the life history of these species and their ecological information will contribute to their conservation. In this study, I described the life history of Laccophilus lewisioides Brancucci, 1983 (Coleoptera: Dytiscidae: Laccophilinae) using rearing‐based methods under laboratory conditions. I then compared the biology of the larval stages of this species to four Laccophilus species, L. vagelineatus Zimmermann, 1922, L. hebusuensis Watanabe & Kamite, 2020, L. yoshitomii Watanabe & Kamite, 2018, and L. kobensis Sharp, 1873. The developmental period for each immature stage at 26°C was as follows: first instar larva, 4–12 days (n = 16); second instar larva, 5–9 days (n = 15); third instar larva, 5–10 days (n = 15); landing to pupation, 2–3 days (n = 2); pupation to adult emergence, 4 days (n = 1); and landing to escape, 8–9 days (n = 14). The total larval period was significantly longer for L. lewisioides than for the other four Laccophilus species. The duration of larval period could be strongly related to the duration of stable water level in the reproductive habitat. The coloration of the larval stage varied between species groups, suggesting that the larvae adapt to the surrounding environment and show a camouflage effect. This is the first report on the immature stages in the life cycle of L. lewisioides.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Life history of Laccophilus lewisioides Brancucci, 1983 (Coleoptera: Dytiscidae) and the ecological significance of the larval period of five Laccophilus species

Watanabe

2022

Entomological Science

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“…It should be noted that the developmental periods of the 19 Dytiscidae species presented by Kingsley (1985) are based on literature and not on uniform conditions. The larval periods of several Dytiscidae species have been examined under the same temperature conditions as the present study thereafter (e.g., Watanabe 2020aWatanabe , 2020bWatanabe , 2021. No Dytiscidae species previously documented has a shorter developmental period than E. sticticus.…”

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confidence: 93%

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

et al. 2022

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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.

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“…The elucidation of life histories and immature stages will not only contribute to the taxonomy and phylogenetics of this species, but will also improve aquatic biodiversity conservation (e.g. Ohba 2009;Watanabe et al 2017aWatanabe et al , 2020Watanabe 2021).…”

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Life history of Copelatus zimmermanni Gschwendtner, 1934 (Coleoptera: Dytiscidae) and the ecological significance of the larval period of three Copelatus species

Watanabe

Ohba

2022

Entomological Science

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Diving beetles (Dytiscidae) play an important ecological role in most aquatic water habitats. However, approximately 40% of dytiscids in Japan have been classified as threatened, and further knowledge on their life history is necessary to support conservation efforts. In this study, we collected adult Copelatus zimmermanni (Coleoptera: Dytiscidae) from an ephemeral rain pool and raised a generation under laboratory conditions. We then compared the larval period with two Copelatus species, C. parallelus and C. masculinus. Complete development (egg to adult) occurred in 39–61 days (n = 10) and comprised the following stages: egg (3–6 days, n = 20), first instar (3–8 days, n = 20), second instar (3–12 days, n = 15), third instar larvae (4–13 days, n = 14), and landing to escape (11–36 days, n = 10). The third instar and total larval periods of C. zimmermanni were significantly shorter than those of C. parallelus and C. masculinus. The differences in the duration of larval periods may be related to the permanence of water sources used as reproductive sites for each species. We suggest that the shorter developmental period of C. zimmermanni allows it to complete entire lifecycles even in highly ephemeral aquatic habitats. This is the first report on the immature stages of a species within the C. nigrolineatus species group.

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Biology of the Small Diving Beetle Laccophilus yoshitomii Watanabe and Kamite, 2018 (Coleoptera: Dytiscidae) and Rearing Methods

Cited by 11 publications

References 6 publications

Life history of Laccophilus lewisioides Brancucci, 1983 (Coleoptera: Dytiscidae) and the ecological significance of the larval period of five Laccophilus species

Life history of Laccophilus lewisioides Brancucci, 1983 (Coleoptera: Dytiscidae) and the ecological significance of the larval period of five Laccophilus species

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

Life history of Copelatus zimmermanni Gschwendtner, 1934 (Coleoptera: Dytiscidae) and the ecological significance of the larval period of three Copelatus species

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