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 1817 [Hydaticini] LM87
    |--H. (Hydaticus) M03
    |    |  i. s.: *H. (H.) transversalis (Pontoppidan 1763) [=Dytiscus transversalis] LM87
    |    |--H. (H.) seminiger M03
    |    `--+--H. (H.) aruspex M03
    |       `--H. (H.) cinctipennis M03
    `--H. (Guignotites) M03
         |  i. s.: H. (G.) bivittatus M01
         |--+--H. (G.) subfasciatus M03
         |  `--H. (Hydaticinus) xanthomelas M03
         `--+--H. (G.) parallelus Clark 1864 M03, LM87 [incl. H. consimilis Régimbart 1887 LM87]
            `--+--+--H. (G.) bowringi M03
               |  `--H. (G.) major M03
               `--+--H. (G.) fabricii M03
                  `--H. (G.) grammicus M03

Hydaticus incertae sedis:
  H. consanguineus Aubé 1838 LM87
  H. conspersus Régimbart 1899 I92
  H. daemeli Sharp 1882 LM87
  H. fabricii (Macleay 1825) [=Colymbetes fabricii] LM87
  H. finus Watts 1978 LM87
  H. flavocinctus M86
  H. goryi Aubé 1836 [incl. H. bihamatus Aubé 1838] LM87
  H. jucundus M03
  H. microdaemeli Watts 1978 LM87
  H. pacificus I92
  H. pulcher (Clark 1863) [=Colymbetes pulcher] LM87
  H. thermonectoides Sharp 1884 I92
  H. variegatus Watts 1978 LM87
  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


[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.

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