著者

Minoshima Yusuke Hayashi Masakazu

出版者

National Museum

雑誌

Acta Entomologica Musei National Pragae (ISSN:03741036)

巻号頁・発行日

vol.51, pp.1-118, 2011-06-30

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Larval morphology of the Japanese representatives of the tribes Acidocerini, Hydrobiusini and Hydrophilini (Coleoptera, Hydrophilidae, Hydrophilinae) is described. Eleven species assigned to seven genera are studied: Agraphydrus narusei (Satô, 1960) (fi rst and third instars), Enochrus (Holcophilydrus) simulans (Sharp, 1873) (all instars), E. (H.) umbratus Sharp, 1884 (third instar), E. (Methydrus) japonicus (Sharp, 1873) (all instars), Helochares (Helochares) pallens (MacLeay, 1825) (all instars), H. (Hydrobaticus) anchoralis Sharp, 1890 (fi rst instar), H. (Hydrobaticus) nipponicus Hebauer, 1995 (all instars), Hydrobius pauper Sharp, 1884 (second and third instars), Hydrochara affi nis (Sharp, 1873) (fi rst and third instars), Hydrophilus (Hydrophilus) acuminatus Motschulsky, 1854 (all instars), and Sternolophus (Sternolophus) rufi pes (Fabricius, 1792) (all instars). Three aspects of larval morphology were evaluated for each species studied: (1) general morphology; (2) chaetotaxy of the head capsule and its appendages; (3) morphological transformations between instars. Primary chaetotaxy is rather stable among taxa and instars examined, thus we were able to distinguish primary and secondary sensilla even in the majority of the second and third instar larvae studied. Secondary chaetotaxy shows slight intraspecifi c variation. Presence/absence of secondary sensilla may be useful at least for distinguishing the fi rst larval instar from later instars, and often for distinguishing all three larval instars. The arrangement of primary and secondary sensilla shows differences among the tribes and genera studied, and between species in Enochrus Thomson, 1859 and Helochares Mulsant, 1844. The pattern of character transformations between larval instars is rather constant among taxa examined. Generic keys of aquatic Hydrophilidae, tribes Acidocerini and Hydrophilini from Japan, and key to Japanese species of Enochrus and Helochares with known larvae are provided.

著者

Minoshima Yusuke Hayashi Masakazu

出版者

National Museum

雑誌

Acta Entomologica Musei National Pragae (ISSN:03741036)

巻号頁・発行日

vol.51, pp.1-118, 2011-06-30

被引用文献数

2

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Larval morphology of the Japanese representatives of the tribes Acidocerini, Hydrobiusini and Hydrophilini (Coleoptera, Hydrophilidae, Hydrophilinae) is described. Eleven species assigned to seven genera are studied: Agraphydrus narusei (Satô, 1960) (fi rst and third instars), Enochrus (Holcophilydrus) simulans (Sharp, 1873) (all instars), E. (H.) umbratus Sharp, 1884 (third instar), E. (Methydrus) japonicus (Sharp, 1873) (all instars), Helochares (Helochares) pallens (MacLeay, 1825) (all instars), H. (Hydrobaticus) anchoralis Sharp, 1890 (fi rst instar), H. (Hydrobaticus) nipponicus Hebauer, 1995 (all instars), Hydrobius pauper Sharp, 1884 (second and third instars), Hydrochara affi nis (Sharp, 1873) (fi rst and third instars), Hydrophilus (Hydrophilus) acuminatus Motschulsky, 1854 (all instars), and Sternolophus (Sternolophus) rufi pes (Fabricius, 1792) (all instars). Three aspects of larval morphology were evaluated for each species studied: (1) general morphology; (2) chaetotaxy of the head capsule and its appendages; (3) morphological transformations between instars. Primary chaetotaxy is rather stable among taxa and instars examined, thus we were able to distinguish primary and secondary sensilla even in the majority of the second and third instar larvae studied. Secondary chaetotaxy shows slight intraspecifi c variation. Presence/absence of secondary sensilla may be useful at least for distinguishing the fi rst larval instar from later instars, and often for distinguishing all three larval instars. The arrangement of primary and secondary sensilla shows differences among the tribes and genera studied, and between species in Enochrus Thomson, 1859 and Helochares Mulsant, 1844. The pattern of character transformations between larval instars is rather constant among taxa examined. Generic keys of aquatic Hydrophilidae, tribes Acidocerini and Hydrophilini from Japan, and key to Japanese species of Enochrus and Helochares with known larvae are provided.

著者

Minoshima Yûsuke Hayashi Masakazu

出版者

Magnolia Press

雑誌

Zootaxa (ISSN:11755326)

巻号頁・発行日

vol.3351, pp.47-59, 2012-06-19

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The larval morphology of Amphiops mater mater Sharp, 1873 is described, including chaetotaxy and morphological transformation between instars. Among genera of the family Hydrophilidae, the larvae of Amphiops Erichson, 1843 may be distinguished by the following combination of characters: coronal line present; clypeolabrum almost symmetrical; mandibles symmetrical and with three inner teeth; dorsal surface of palpomere 1 completely sclerotized; mentum with strongly projecting and sharply pointed anterior corners; ligula absent; spiracular atrium well developed. Several primary sensilla are absent from all instars of A. mater mater, in contrast to the stable chaetotaxy in the majority of Hydrophilidae species studied in detail to date.

著者

Minoshima Yûsuke Hayashi Masakazu

出版者

Taylor & Francis

雑誌

Journal of Natural History (ISSN:00222933)

巻号頁・発行日

vol.45, no.45-46, pp.2757-2784, 2011-10-20

被引用文献数

5

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The larval morphology of the genus Hydrocassis Fairmaire, 1878 is described on the basis of three species of the genus: second instar of H. jengi Satô, 1998, all instars of H. lacustris (Sharp, 1884) and second and third instars of H. uncinata Ji et Schödl, 1998; the former two belong to the H. scapulata species group and the latter to the H. scaphoides species group. Primary chaetotaxy of the larval head of Hydrocassis is described based on the first instar larvae of H. lacustris. Larval morphology of all genera of Sperchopsini with known larvae is summarized based on descriptions and figures from the literature, which are compared with Hydrocassis: larval morphology of Hydrocassis is similar to that of Sperchopsis, and the presumably closely related genus Ametor is distinguishable from Hydrocassis by characters of larval morphology. A key to the Sperchopsini genera on the basis of larval characters is provided.