Hydaticus seminiger, copyright Udo Schmidt.

Belongs within: Dytiscinae.

Hydaticus is a cosmopolitan genus of diving beetles characterised by straight anterolateral margins on the metasternum, a stridulatory device in males consisting of a region of reticulate cells on the dorsum of the second protarsal segment and a series of pegs along the dorsal margin of the protibia, and an irregularly rugulose surface to the pronotum and the humeral regions of the elytra in females (Miller 2003).

<==Hydaticus Leach 1817LM87 [=Icmaleus Gistel 1856NR97]
    |--H. (Hydaticus)M03
    |    |  i. s.: *H. (H.) transversalis (Pontoppidan 1763)LM87 [=Dytiscus transversalisLM87, *Icmaleus transversalisNR97]
    |    |--H. (H.) seminigerM03
    |    `--+--H. (H.) aruspex Clark 1864M03, BMB14
    |       `--H. (H.) cinctipennis Aubé 1838M03, FS90
    `--H. (Guignotites)M03
         |  i. s.: H. (G.) bivittatusM01
         |--+--H. (G.) subfasciatusM03
         |  `--H. (Hydaticinus) xanthomelasM03
         `--+--H. (G.) parallelus Clark 1864M03, LM87 [incl. H. consimilis Régimbart 1887LM87]
            `--+--+--H. (G.) bowringiM03
               |  `--H. (G.) majorM03
               `--+--H. (G.) fabriciiM03
                  `--H. (G.) grammicusM03
Hydaticus incertae sedis:
  H. bimarginatusBM06
  H. consanguineus Aubé 1838LM87
  H. conspersus Régimbart 1899I92
  H. daemeli Sharp 1882LM87
  H. fabricii (Macleay 1825)LM87 [=Colymbetes fabriciiLM87; incl. H. rufulusR89a]
  H. finus Watts 1978LM87
  H. flavocinctusM86
  H. fulvonotatusR89b
  H. goryi Aubé 1836 [incl. H. bihamatus Aubé 1838]LM87
  H. jucundusM03
  H. leander Rossi 1790BMB14
  H. litigiosusR89a
  H. luczonicusR89a
  H. matruelisR89b
  H. microdaemeli Watts 1978LM87
  H. pacificusI92
  H. platamboides Régimbart 1889R89b
  H. pulcher (Clark 1863) [=Colymbetes pulcher]LM87
  H. quadrivittatusPH10
  H. rimosus Aubé 1838FS90
  H. stagnalis Fab. 1787FS90
  H. thermonectoides Sharp 1884I92
  H. ussheriR89b
  H. variegatus Watts 1978LM87
  H. vittatus (Fabricius 1775) [=Dytiscus vittatus]LM87
  H. wattsi Daussin 1980 [=H. modestus Watts 1978 non Sharp 1882]LM87

*Type species of generic name indicated


[BM06] Bergsten, J., & K. B. Miller. 2006. Taxonomic revision of the Holarctic diving beetle genus Acilius Leach (Coleoptera: Dytiscidae). Systematic Entomology 31: 145–197.

[BMB14] Bukontaite, R., K. B. Miller & J. Bergsten. 2014. The utility of CAD in recovering Gondwanan vicariance events and the evolutionary history of Aciliini (Coleoptera: Dytiscidae). BMC Evolutionary Biology 14: 5.

[FS90] Fleutiaux, E., & A. Sallé. 1890. Liste des coléoptères de la Guadeloupe et descriptions d’espèces nouvelles. Annales de la Société Entomologique de France, 6e série 9: 351–484.

[I92] Iwahashi, J. (ed.) 1992. Reddo Deeta Animaruzu: a pictorial of Japanese fauna facing extinction. JICC: Tokyo.

[LM87] Lawrence, J. F., B. P. Moore, J. E. Pyke & T. A. Weir. 1987. Zoological Catalogue of Australia vol. 4. Coleoptera: Archostemata, Myxophaga and Adephaga. Australian Government Publishing Service: Canberra.

[M86] Macleay, W. 1886. The insects of the Fly River, New Guinea, “Coleoptera”. Proceedings of the Linnean Society of New South Wales, series 2, 1 (1): 136–157.

[M01] Miller, K. B. 2001. On the phylogeny of the Dytiscidae (Insecta: Coleoptera) with emphasis on the morphology of the female reproductive system. Insect Systematics and Evolution 32: 45–92.

[M03] Miller, K. B. 2003. The phylogeny of diving beetles (Coleoptera: Dytiscidae) and the evolution of sexual conflict. Biological Journal of the Linnaean Society 79: 359–388.

[NR97] Nilsson, A. N., & R. E. Roughley. 1997. The genus- and family-group names of the Dytiscidae—additions and corrections. Beiträge zur Entomologie 47 (2): 359–364.

[PH10] Pinder, A. M., S. A. Halse, R. J. Shiel & J. M. McRae. 2010. An arid zone awash with diversity: patterns in the distribution of aquatic invertebrates in the Pilbara region of Western Australia. Records of the Western Australian Museum Supplement 78 (1): 205–246.

[R89a] Régimbart, M. 1889a. Contributions a la faune Indo-Chinoise. 2e mémoire. Hydrocanthares. Annales de la Société Entomologique de France, 6e série 9: 147–156.

[R89b] Régimbart, M. 1889b. Voyage de M. Ch. Alluaud dans le territoire d’Assinie (Afrique occidentale) en juillet et août 1886. 2e mémoire. Dytiscidae et Gyrinidae. Annales de la Société Entomologique de France, 6e série 9: 247–250.

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