Field of Science

Dytiscinae

Megadytes latus, photographed by Wolfgang Walz Hillermann.


Belongs within: Dytiscidae.
Contains: Hydaticus, Aciliini.

The Dytiscinae are a large clade of diving beetles. With the exception of the basal Cybistrini, males of the Dytiscinae have the pro- and mesotarsomeres broadly expanded with ventral sucker-like setae, used to grip the female during mating. In a number of subsequent lineages, females have conversely evolved ornamented elytra that may reduce the effectiveness of such gripping setae (Miller 2003).

Chracters (from Miller 2001): Anterolateral margin of eye evenly rounded; female genitalia of dytiscine type, with bursa absent and spermatophore placed in membranous pouch ventrad of gonocoxae; gonocoxae strongly fused dorsally; median lobe bilaterally symmetrical; larvae with fringe of fine setae along last abdominal segments.

<==Dytiscinae
    |--+--Dytiscus Linnaeus 1758 [Dytiscini] M01
    |  |    |--D. alaskanus M01
    |  |    |--D. cordieri M01
    |  |    |--D. dauricus M01
    |  |    |--D. delictus Zaitsev 1906 I92
    |  |    |--D. fasciventris M03
    |  |    |--D. marginicollis M01
    |  |    |--D. sharpi Wehncke 1875 I92
    |  |    `--D. verticalis M03
    |  `--+--Hyderodes [Hyderodini] M03
    |     |    `--H. shuckardi M03
    |     `--+--Hydaticus M03
    |        `--+--+--Aciliini M03
    |           |  `--Notaticus [Aubehydrinae, Aubehydrini] M03
    |           |       `--N. fasciatus M03
    |           `--Eretes [Eretini] M03
    |                |--E. australis M03
    |                |--E. griseus M03
    |                `--E. sticticus M01
    `--Cybistrini M03
         |  i. s.: Regimbartina pruinosa M01
         |--+--Spencerhydrus M03
         |  |    |--S. latecinctus M03
         |  |    `--S. pulchellus M03
         |  `--+--Austrodytes insularis M01
         |     `--Onychohydrus M03
         |          |--O. (Onychohydrus) M01
         |          |    |--O. (O.) hookeri M01
         |          |    `--O. (O.) scutellaris M01
         |          `--O. (Sternhydrus) atratus M01
         `--+--Cybister M03
            |    |  i. s.: C. cephalotes G89
            |    |--C. marginicollis M01
            |    |--+--C. ellipticus M01
            |    |  `--C. fimbriolatus M01
            |    `--+--C. puncticollis M01
            |       `--C. tripunctatus M01
            |            |--C. t. tripunctatus I92
            |            `--C. t. orientalis Gschwendtner 1931 I92
            `--Megadytes M03
                 |  i. s.: M. aeneus Ormancey 1843 R89
                 |         M. fallax R89
                 |         M. puncticollis R89
                 |--M. (Bifurcitus) giganteus M01
                 `--+--M. (Paramegadytes) glaucus M01
                    `--M. (Megadytes) M01
                         |--M. (M.) fraternus M01
                         |--M. (M.) laevigatus M01
                         |--M. (M.) latus M01
                         `--M. (M.) marginithorax M01

*Type species of generic name indicated

REFERENCES

[G89] Gestro, R. 1889. Viaggio ab Assab nel Mar Rosso dei signori G. Doria ed O. Beccari con il R. Avviso «Esploratore» dal 16 Novembre 1879 al 26 Febbraio 1880. – IV. Coleotteri. Annali del Museo Civico di Storia Naturale di Genova, Serie 2a 7: 5-72.

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

[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.

[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.

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