Liodessus affinis, photographed by Stephen Luk.

Belongs within: Hydroporinae.

The Bidessini is a clade of water beetles in which females of most members (except the basalmost Hydrodessus) possess a strongly sclerotised, stout spine within the spermatheca. Hydrodessus shares with other bidessins fusion of the metacoxae and abdominal sternite 2. A clade excluding Hydrodessus and Amarodytes (previously treated as the Bidessini sensu stricto) is further supported by the presence of bi-segmented lateral lobes on the male genitalia (Miller 2001). Hydrodessus is a Neotropical genus characterised by a lack of basal pronotal striae or of prominent carinae on the elytra.

    |--Hydrodessus M01
    `--+--Amarodytes Régimbart 1900 M01, LM87
       `--+--Hydroglyphus japonicus M01
          |--Limbodessus Guignot 1939 M01, WM13
          |    |--*L. compactus (Clark 1862) [=Hydroporus compactus] WM13
          |    |--L. bennetti Watts & McRae 2013 WM13
          |    |--L. cunyuensis WM13
          |    |--L. narryerensis WM13
          |    `--L. neoguineensis (Régimbart 1892) [=Bidessus neoguineensis] LM87
          |--+--Allodessus Guignot 1953 M01, LM87
          |  |    `--*A. bistrigatus (Clark 1862) (see below for synonymy) LM87
          |  |--Uvarus Guignot 1939 M01, LM87
          |  |    |--*U. lacustris (Say 1823) [=Hydroporus lacustrus, Amarodytes (*Uvarus) lacustris] LM87
          |  |    |--U. chappuisi (Peschet 1932) S86
          |  |    `--U. pictipes (Lea 1899) [=Bidessus pictipes] LM87
          |  `--Bidessodes Régimbart 1900 M01, LM87
          |       |--*B. semistriatus Régimbart 1900 LM87
          |       |--B. bilita Watts 1978 LM87
          |       |--B. denticulatus (Sharp 1882) [=Bidessus denticulatus] LM87
          |       |--B. flavosignatus (Zimmermann 1922) [=Bidessus flavosignatus] LM87
          |       |--B. grossus (Zimmermann 1922) [=Bidessus grossus] LM87
          |       |--B. jucundus M01
          |       `--B. mjobergi (Zimmermann 19220 [=Bidessus mjobergi] LM87
          `--+--Bidessonotus Régimbart 1895 M01, LM87
             |    `--B. obtusatus M01
             |--+--Neoclypeodytes M01
             |  |    |--N. cinctellus M01
             |  |    `--N. leachi M01
             |  `--+--Brachyvatus acuminatus M01
             |     `--Hemibidessus M01
             |          |--H. bifasciatus M01
             |          |--H. celinoides M01
             |          |--H. conicus M01
             |          |--H. plaumanni M01
             |          `--H. spiroductus M01
             `--+--Anodocheilus maculatus M01
                `--Liodessus Guignot 1939 M01, LM87
                     |--*L. affinis (Say 1823) [=Hydroporus affinis, Bidessonotus (*Liodessus) affinis] LM87
                     |--L. amabilis (Clark 1862) [=Hydroporus amabilis] LM87
                     |--L. antrias Guignot 1955 S86
                     |--L. dispar (Sharp 1882) [=Bidessus dispar; incl. B. elegans Lea 1899] LM87
                     |--L. gemellus (Clark 1862) [=Hydroporus gemellus; incl. Bidessus mundus Sharp 1882] LM87
                     |--L. inornatus (Sharp 1882) [=Bidessus inornatus; incl. B. biformis Sharp 1882] LM87
                     |--L. obscurellus M01
                     |--L. praelargus (Lea 1899) [=Bidessus praelargus] LM87
                     `--L. shuckardii (Clark 1862) [=Hydroporus shuckardii] LM87

Bidessini incertae sedis:
  Crinodessus amyae M01
  Phreatodessus Ordish 1976 S86
    `--P. hades Ordish 1976 S86
  Kuschelydrus Ordish 1976 S86
    `--K. phreaticus Ordish 1976 S86
  Trogloguignotus Sanfilippo 1958 S86
    `--T. concii Sanfilippo 1958 S86
  Bidessus C01
    |--B. acuminatus R89
    |--B. affinis R89
    |--B. borrei R89
    |--B. ovoideus Régimbart 1895 B14
    |--B. seydeli B14
    |--B. sharpi B14
    `--B. unistriatus B14
  Clypeodytes Régimbart 1894 LM87
    |--*C. cribrosus (Schaum 1864) [=Hydroporus cribrosus] LM87
    |--C. bifasciatus (Zimmermann 1922) [=Bidessus (Clypeodytes) bifasciatus] LM87
    |--C. darlingtoni Watts 1978 LM87
    `--C. migrator (Sharp 1882) [=Bidessus migrator] LM87
  Guignotus Houlbert 1934 LM87
    |--*G. geminus (Fabricius 1792) [=Bidessus geminus] LM87
    |--G. basalis (Macleay 1871) [=Hydroporus basalis; incl. Bidessus fuscolineatus Lea 1899] LM87
    |--G. daemeli (Sharp 1882) [=Bidessus daemeli] LM87
    |--G. godeffroyi (Sharp 1882) [=Bidessus godeffroyi] LM87
    |--G. leai Guignot 1939 [=Bidessus pusillus Lea 1899 non Fabricius 1781] LM87
    |--G. mastersii (Macleay 1871) [=Hydroporus mastersii] LM87
    |--G. orthogrammus (Sharp 1882) [=Bidessus orthogrammus] LM87
    |--G. signatus (Sharp 1882) [=Bidessus signatus] LM87
    |--G. trifasciatus Watts 1978 LM87
    `--G. trilineatus Watts 1978 LM87
  Gibbidessus Watts 1978 LM87
    `--*G. chipi Watts 1978 LM87
  Terradessus Watts 1982 LM87
    `--*T. caecus Watts 1982 LM87

*Allodessus bistrigatus (Clark 1862) [=Hydroporus bistrigatus, Bidessus bistrigatus; incl. B. granularis Balfour-Browne 1944, Hydroporus luridus Macleay 1871, B. luridus, B. pallidus Lea 1899] LM87

*Type species of generic name indicated


[B14] Bouchard, P. (ed.) 2014. The Book of Beetles: A lifesize guide to six hundred of nature's gems. Ivy Press: Lewes (United Kingdom).

[C01] Csiki, E. 1901. Bogarak [Coleopteren]. In: Horváth, G. (ed.) Zichy Jenő Gróf Harmadik Ázsiai Utazása [Dritte Asiatische Forschungsreise des Grafen Eugen Zichy] vol. 2. Zichy Jenő Gróf Harmadik Ázsiai Utazásának Állattani Eredményei [Zoologische Ergebnisse der Dritten Asiatischen Forschungsreise des Grafen Eugen Zichy] pp. 75–120. Victor Hornyánszky: Budapest, and Karl W. Hierseman: Leipzig.

[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.

[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.

[R89] Régimbart, M. 1889. Enumération des Haliplidae, Dytiscidae et Gyrinidae recueillis par M.r le Prof. L. Balzan dans l’Amérique méridionale et description de quelques autres espèces voisines. Annali del Museo Civico di Storia Naturale di Genova, Serie 2a, 7: 256–268.

[S86] Spangler, P. J. 1986. Insecta: Coleoptera. In: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 622–631. E. J. Brill/Dr W. Backhuys: Leiden.

[WM13] Watts, C. H. S., & J. McRae. 2013. Limbodessus bennetti sp. nov., the first stygobitic Dytiscidae (Coleoptera) from the Pilbara region of Western Australia. Records of the Western Australian Museum 28 (2): 141–143.

Last updated: 30 January 2018.

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