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: 1583
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
Papers
In memoriam of Professor Miroslav Papáček (1953–2019): biography, memories, bibliography and list of described taxaNew water strider species of Eurymetra from Madagascar (Hemiptera: Heteroptera: Gerridae)Taxonomic catalogue of the family Ochteridae with description of Ochterus papacekisp. nov. from Socotra Island and Tanzania (Hemiptera: Heteroptera)Review of Caryocolum (Lepidoptera: Gelechiidae) from the Russian Altai with description of two new speciesDiscovery of termitophilous rove beetles associated with Formosan subterranean termite Coptotermes formosanus in Taiwan, with the first larval description for the tribe Termitohospitini (Coleoptera: Staphylinidae)Schizaraeus fouquei sp. nov., the first record of Schizaraeus from Peru (Coleoptera: Tenebrionidae: Stenosini)Generic revision of the Microhoriini with new species and synonymies from the Palaearctic Region (Coleoptera: Anthicidae)Review of the genus Coelostoma of Taiwan with description of a new species (Coleoptera: Hydrophilidae)New species of karst-dwelling Pselaphinae from southwestern China (Coleoptera: Staphylinidae)The discovery of the genus Bryanellocoris from Laos, with description of a new species (Heteroptera: Rhyparochromidae)Review of the genus-level names proposed by Johannes Gistel in Chrysomelidae (Coleoptera)Review of the Afrotropical species of the genus Prometopia (Coleoptera: Nitidulidae: Prometopiinae)Depressariidae (Lepidoptera) of the Russian Altai Mountains: new species, new records and updated checklistImmature stages and biology of the enigmatic oxyporine rove beetles, with new data on Oxyporus larvae from the Russian Far East (Coleoptera: Staphylinidae)Anthomyzidae (Diptera) of Taiwan: new species but no new recordsTaxonomy of Guatemalan water beetles in the genus Hydrochus (Coleoptera: Hydrochidae)Revision of Euspilotus, subgenus Platysaprinus, with description of two new species (Coleoptera: Histeridae)Morphology of immature stages of Helophorus (Gephelophorus) auriculatus (Coleoptera, Helophoridae)Three new species of the genus Sphaerobulbus from China (Coleoptera: Staphylinidae)Scobinigaster, a new genus of Lethaeini from Madagascar (Hemiptera: Heteroptera: Rhyparochromidae)Catalogue of type specimens of beetles (Coleoptera) deposited in the National Museum, Prague, Czech Republic. Staphylinidae: Staphylininae: Staphylinini: PhilonthinaCorrect original spelling of Venanides caspicus (Hymenoptera: Braconidae)