Morphology of immature stages of Helophorus (Gephelophorus) auriculatus (Coleoptera, Helophoridae)
Minoshima Yusuke N., Watanabe Reiya
Acta Entomologica Musei Nationalis Pragae 60(1): 319-332, 2020
Published online: 15th May 2020
Published in print: 15th June 2020
Views: 1734
Abstract: The morphology of immature stages of Helophorus (Gephelophorus) auriculatus
Sharp, 1884 is described. This is the first description of the larva and pupa
of the subgenus Gephelophorus Sharp, 1915. We describe the morphology of the
egg-case, all larval stages (first to third instar, including chaetotaxy of the
head) and pupa. Morphological transformations between larval instars were
examined. Head chaetotaxy was nearly identical between instars. Ventral teeth on
the nasale, considered as a useful taxonomic character, were absent in the first
instar but well developed in later instars. Chaetotaxy differed among the
subgenera Gephelophorus, Helophorus and Lihelophorus in the length and shape of
setae on head capsule and maxilla. Pupal morphology was similar to that of
previously described pupae: H. (Helophorus) aquaticus (Linnaeus, 1758) and H.
(Rhopalohelophorus) orientalis Motschulsky, 1860. A key to families of the
Hydrophiloidea of Japan based on larval characters is provided.
Key words: Hydrophiloidea, Helophoridae, Helophorus, egg-case, larva, pupa, chaetotaxy, endangered species, Japan, Palaearctic Region
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