Austridotea annectens, copyright Paddy Ryan.

Belongs within: Valvifera.

The Mesidoteinae are a group of relatively unspecialised valviferans exhibiting a benthic lifestyle (Nicholls 1937).

Characters (from Nicholls 1937): Body flattened and ovate; eyes small; distinct coxal plates present on six of the seven free mesosomatic segments; three or four pleonites present of at least I and II are free.

<==Mesidoteinae [Mesidoteini]
    |--Mesidotea Richardson 1905 (nom. cons.) (see below for synonymy)ICZN63
    |    |--*M. entomon (Linnaeus 1758)ICZN63 [=Oniscus entomonICZN63, Saduria entomonBP03, Mesidothea eniomon Gurjanova 1936ICZN63]
    |    |--*Idotaega’ longicauda Lockington 1877ICZN63
    |    |--M. sabini (Kröyer 1846)N37, S00 (see below for synonymy)
    |    `--M. sibiricaN37
    `--Austridotea Nicholls 1937N37
         |--A. (Austridotea)N37
         |    |--A. (A.) annectens Nicholls 1937N37
         |    `--A. (A.) benhami Nicholls 1937N37
         `--A. (Notidotea Nicholls 1937)N37
              |--A. (N.) lacustris (Thomson 1879) [=Idotea lacustris, Pentidotea lacustris]N37
              `--A. (N.) rotundicauda (Miers 1881) [=Idotea rotundicauda]N37

Mesidotea Richardson 1905 (nom. cons.) [=Mesidothea Stephensen 1913; incl. Idotaega Lockington 1877 (nom. rej.), Idotoega, Saduria Adams 1852 (nom. rej.)]ICZN63

Mesidotea sabini (Kröyer 1846)N37, S00 [=Idothea sabiniS00, Chiridotea sabiniS00, Chiridothea sabiniS00, Glyptonotus sabiniS00, Idotea sabiniS00, Mesidothea sabineiICZN63]

*Type species of generic name indicated


[BP03] Brandt, A., & G. C. B. Poore. 2003. Higher classification of the flabelliferan and related Isopoda based on a reappraisal of relationships. Invertebrate Systematics 17: 893–923.

[ICZN63] ICZN. 1963. Idotea Fabricius, 1798, and Mesidotea Richardson, 1905 (Crustacea, Decapoda): validation under the plenary powers. Bulletin of Zoological Nomenclature 20 (1): 18–25.

[N37] Nicholls, G. E. 1937. On the freshwater Idoteidae of New Zealand (Crustacea, Isopoda). Annals and Magazine of Natural History, series 10, 19: 113–136.

[S00] Stebbing, T. R. R. 1900. Arctic Crustacea: Bruce collection. Annals and Magazine of Natural History, series 7, 5: 1–16.

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