Asellus (Asellus)

Water hoglouse Asellus aquaticus, copyright Peter Pfeiffer.

Belongs within: Asellidae.

The subgenus Asellus of the genus freshwater isopod genus Asellus is characterised by a lack of spines on the propodite of the male first legs (Hatch 1947). Representatives include the Holarctic species A. aquaticus which has cultivated as a source of fish food.

Characters (from Hatch 1947): Body usually elongate, depressed. Head usually narrower and shorter than first thoracic segment; eyes usually present; mandible with three-segmented palp. Abdomen usually not longer than broad. Male with inner margin of posterior surface of propodite of first legs not produced in teeth or immovable spines.

<==Asellus Geoffroy 1762 (Asellus)HLM86
    |--A. (A.) amamiensis Matsumoto 1961HLM86
    |--A. (A.) aquaticus (Linnaeus 1758)HLM86 [=Oniscus aquaticusL02]
    |    |--A. a. aquaticusHLM86
    |    |--A. a. carsicus Karaman 1952HLM86
    |    |--A. a. cavernicolus Racovitza 1925HLM86
    |    |--A. a. cyclobranchialis Sket 1965HLM86
    |    |--A. a. fribergensis Schneider 1887HLM86
    |    `--A. a. longicornis Sket 1965HLM86
    |--A. (A.) birsteini Levanidov 1976HLM86
    |--A. (A.) ezoensis Matsumoto 1962HLM86
    |--A. (A.) hilgendorfi Bovallius 1886HLM86
    |    |--A. h. hilgendorfi Bovallius 1886HLM86
    |    `--A. h. ryukyuensis Ueno 1938HLM86
    |--A. (A.) hyugaensis Matusmoto 1960HLM86
    |--A. (A.) kumaensis Matsumoto 1960HLM86
    |--A. (A.) monticola [incl. A. monticola var. fontinalis Birstein 1936]HLM86
    |--A. (A.) musashiensis Matsumoto 1961HLM86
    |--A. (A.) shikokuensis Matsumoto 1960HLM86
    |--A. (A.) tamaensis Matsumoto 1961HLM86
    `--A. (A.) tomalensisH47

*Type species of generic name indicated

References

[H47] Hatch, M. H. 1947. The Chelifera and Isopoda of Washington and adjacent regions. University of Washington Publications in Biology 10 (5): 155–274.

[HLM86] Henry, J.-P., J. J. Lewis & G. Magniez. 1986. Isopoda: Asellota: Aselloidea, Gnathostenetroidoidea, Stenetrioidea. In: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 434–464. E. J. Brill/Dr W. Backhuys: Leiden.

[L02] Latreille, P. A. 1802. Histoire Naturelle, générale et particulière des crustacés et des insectes vol. 3. Familles naturelles des genres. F. Dufart: Paris.

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