Helochares, Mulsant, 1844

Minoshima, Yûsuke & Hayashi, Masakazu, 2011, Larval morphology of the Japanese species of the tribes Acidocerini, Hydrobiusini and Hydrophilini (Coleoptera: Hydrophilidae), Acta Entomologica Musei Nationalis Pragae (suppl.) 51, pp. 1-118 : 53

publication ID	https://doi.org/10.5281/zenodo.4272324
DOI	https://doi.org/10.5281/zenodo.4334956
persistent identifier	https://treatment.plazi.org/id/039A87CB-FFBB-4945-FF4A-FE11FBD4ED3A
treatment provided by	Felipe (2020-11-13 20:12:49, last updated 2024-11-26 05:55:16)
scientific name	Helochares
status

Treatment

Key to the known species of the genus Helochares View in CoL from Japan (all instars) 2

1. Secondary sensilla between PA6 and PA7 absent ( Fig. 29A View Fig ); mandible with two setae (MN1 and MN5) ( Figs. 30 View Fig B–C); distal part of outer face of stipes with two setae ( MX 5 and MX 6) ( Figs. 30 View Fig D–E); lateral face of mentum without stout setae ( Figs. 30 View Fig F–G). First instar. ............................................................................................................................... 2

- Secondary sensilla between PA6 and PA7 present ( Figs. 34 View Fig , 43 View Fig ); mandible with more than two setae ( Figs. 33 View Fig C–D); distal part of outer face of stipes with three setae ( Figs. 33 View Fig E–F); lateral face of mentum with stout setae ( Figs. 33 View Fig G–H). Second and third instars. ......... 4

2. Epistomal lobe with one short scale-like seta and two short, trichoid to spiniform setae ( Fig. 29C View Fig ). ..................................................... H. (Helochares) pallens ( MacLeay, 1825) View in CoL

- Epistomal lobe with two short scale-like setae and two short, trichoid to spiniform setae ( Fig. 36C View Fig ). ....................................................................................................................... 3

3. Seta PA7 trichoid ( Fig. 36A View Fig ). ....................... H. (Hydrobaticus) anchoralis Sharp, 1890 View in CoL

- Seta PA7 scale-like ( Fig. 38A View Fig ). ............... H. (Hydrobaticus) nipponicus Hebauer, 1995 View in CoL

4. Epistomal lobe with one short scale-like seta and two short, trichoid to spiniform setae ( Fig. 33A View Fig ). ..................................................... H. (Helochares) pallens ( MacLeay, 1825) View in CoL

- Epistomal lobe with two short scale-like setae and two short, trichoid to spiniform setae ( Fig. 42A View Fig ). ............................................... H. (Hydrobaticus) nipponicus Hebauer, 1995 View in CoL

References

HEBAUER F. 1995: Neues zu den Acidocerina Hansen (Helocharae d'Orchymont) der indomalaiischen Region (Coleoptera, Hydrophilidae). Acta Coleopterologica 11 (3): 3 - 14.

MACLEAY W. S. 1825: Annulosa Javanica or an attempt to illustrate the natural affinities and analogies of the Insects collected in Java by Thomas Horsfield, M. D. F. L. & G. S. and deposited by him in the Museum of the Honourable East-India Company. Kingsbury, Parbury, and Allen, London, 50 pp. + 1 pl.

SHARP D. 1890: On some aquatic Coleoptera from Ceylon. Transactions of the Entomological Society of London 1890: 339 - 359.

Figures

Fig. 29. Head capsule of Helochares (Helochares) pallens (MacLeay, 1825), first instar.A – dorsal view; B – ventral view; C – detail of anterior margin of head capsule, dorsal view.

Fig. 30. Head appendages of Helochares (Helochares) pallens (MacLeay, 1825), first instar. A – antenna, dorsal view; B–C – mandibles, dorsal view; D – maxilla, dorsal view; E – maxilla, ventral view; F – labium, dorsal view; G – labium, ventral view.

Fig. 34. Helochares (Helochares) pallens (MacLeay, 1825), chaetotaxy of head capsule, dorsal view. A – median part of head capsule, second instar. B–D – third instar larva: B – median part of head capsule; C – intraspecific variation of secondary sensilla between PA6 and PA7; D – intraspecific variation of secondary sensilla on outer part of antennal socket. Secondary sensilla are marked by a black rhombus.

Fig. 43.Helochares (Hydrobaticus) nipponicus Hebauer, 1995, chaetotaxy of head capsule, dorsal view.A–B – second instar larva:A – median part of head capsule; B – intraspecific variation of secondary sensilla between PA6 and PA7. C–D – third instar larva: C – median part of head capsule; D – intraspecific variation of secondary sensilla between PA6 and PA7. Secondary sensilla are marked by a black rhombus.

Fig. 33. Helochares (Helochares) pallens (MacLeay, 1825), third instar.A – clypeolabrum, dorsal view; B – antenna, dorsal view; C–D – mandibles, dorsal view; E – maxilla, dorsal view; F – maxilla, ventral view; G – labium, dorsal view; H – labium, ventral view.

Fig. 29. Head capsule of Helochares (Helochares) pallens (MacLeay, 1825), first instar.A – dorsal view; B – ventral view; C – detail of anterior margin of head capsule, dorsal view.

Fig. 36. Head capsule of Helochares (Hydrobaticus) anchoralis Sharp, 1890, first instar.A – dorsal view; B – ventral view; C – detail of anterior margin of head capsule, dorsal view.

Fig. 38. Head capsule of Helochares (Hydrobaticus) nipponicus Hebauer, 1995, first instar. A – dorsal view; B – ventral view; C – detail of anterior margin of head capsule, dorsal view.

Fig. 42. Helochares (Hydrobaticus) nipponicus Hebauer, 1995, third instar.A – clypeolabrum, dorsal view; B – antenna, dorsal view; C–D – mandibles, dorsal view; E – maxilla, dorsal view; F – maxilla, ventral view; G – labium, dorsal view; H – labium, ventral view.