Larval morphology of Crephelochares and Peltochares (Coleoptera: Hydrophilidae)

IF 0.9 4区农林科学 Q3 ENTOMOLOGY

Acta Entomologica Musei Nationalis Pragae Pub Date : 2023-11-24 DOI:10.37520/aemnp.2023.019

Y. Minoshima, M. Fikáček, Hsing-Che Liu

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Abstract

The larval morphology of Crephelochares Kuwert, 1890 and Peltochares Régimbart, 1907 is described in detail based on specimens of C. abnormalis (Sharp, 1890) and P. atropiceus (Régimbart, 1903) collected in Taiwan; the chaetotaxy of the head capsule and head appendages of both genera is described for the first time. Larvae were obtained by laboratory rearing and field collecting; field collected larvae were identified by morphological comparison with those reared in the laboratory. Larval morphology of C. abnormalis corresponds with that of C. nitescens (Fauvel, 1883) except for the serrate margin of the nasale in C. abnormalis. We confirm that Crephelochares does not construct the usual egg case, and report active behaviour of its larvae, possibly indicating they are not ambush predators. Larval morphology of P. atropiceus corresponds with that of P. foveicollis; on the other hand, we conclude that the larvae previously described as Peltochares from Madagascar belong to Tritonus Mulsant, 1844 of the tribe Laccobiini. The egg-carrying behaviour of Peltochares is confirmed. We briefly summarize the state of the knowledge of immature stages of the Acidocerinae, indicating that a special effort in discovering and describing immature stages from northern South America and Brazil is needed.

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Crephelochares 和 Peltochares（鞘翅目：嗜水科）的幼虫形态

根据在台湾采集的C. abnormalis (Sharp, 1890) 和 P. atropiceus (Régimbart, 1903) 标本，详细描述了Crephelochares Kuwert, 1890 和 Peltochares Régimbart, 1907 的幼虫形态；首次描述了这两个属的头囊和头附属物的混沌构造。幼虫通过实验室饲养和野外采集获得；野外采集的幼虫通过与实验室饲养的幼虫形态比较进行鉴定。C. abnormalis 的幼虫形态与 C. nitescens（Fauvel，1883 年）一致，除了 C. abnormalis 的鼻甲边缘有锯齿。我们确认 Crephelochares 没有构造通常的卵箱，并报告了其幼虫的活跃行为，这可能表明它们不是伏击捕食者。P. atropiceus的幼虫形态与P. foveicollis的幼虫形态一致；另一方面，我们得出结论，之前被描述为马达加斯加Peltochares的幼虫属于Laccobiini科的Tritonus Mulsant，1844年。Peltochares 的携卵行为得到了证实。我们简要总结了对 Acidocerinae 未成熟阶段的了解情况，指出需要特别努力发现和描述南美洲北部和巴西的未成熟阶段。

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来源期刊

Acta Entomologica Musei Nationalis Pragae ENTOMOLOGY-

CiteScore

1.60

自引率

16.70%

发文量

审稿时长

6-12 weeks

期刊介绍： An open access journal publishing papers on insect systematics, morphology of adult and immature stages and/or their biology, phylogeny, large-scale catalogues, and general papers on methodology of insect systematics AEMNP is publishing papers on: Insect systematics, taxonomy and nomenclature; Morphology of adult and immature stages and/or their biology with possible applications in taxonomy and phylogeny; Phylogeny at least partly based on morphological characters (or with morphological characters mapped on the tree); Catalogues applicable for further taxonomy and biodiversity studies; General papers on methodology of insect taxonomy.