Idothea baltica, copyright Ecomare.

Belongs within: Valvifera.

Idothea is a genus of broad-bodied isopods that may be found living on floating vegetation (Hatch 1947). They are predominantly grazers on macrophytes, and coloration in some species may change depending on the food species. The North Atlantic species I. baltica is found in the subtidal zone near the shore.

Characters (from Hatch 1947): Eyes lateral, the sides of the head below the eyes inflexed; head margined behind eyes, without a transverse furrow defining a “neck” region; first antennae with unsegmented flagellum; fifth segment of maxillipedal palp fused with fourth; thoracic segments two to four with distinct epimera; epimera of fifth thoracic segment usually not attaining posterior margin of the segment; legs subsimilar, prehensile, the propodite not dilated; abdomen three-segmented with the lateral sutures of another partially coalesced segment.

<==Idothea Fab. 1799 [=Idotaea, Idotea Fab. 1796 (preoc.); Idoteinae]H47
|--‘Idotea’ algirica Lucas 1846E12
|--‘Idotea’ angustata Lucas 1846E12
|--I. annulataN37
|--I. balticaM02
| |--I. b. balticaPP64
| `--I. b. basteriPP64
|--‘Idotea’ carinata Lucas 1846E12
|--I. emarginataB78
|--‘Idotea’ entomonG20
|--I. fewkesiH47
|--‘Idotea’ granulosaCS77
|--‘Idotea’ hecticaPP64
|--‘Idotea’ linearisPP64
|--‘Idotea’ marina (Linnaeus 1758)L02, L58 [=Oniscus marinusL02]
|--I. metallica Bosc 1802BP03
|--I. neglecta Sars 1897BP03
|--I. ochotensis [=Idotea ochotensis]H47
|--I. pelagicaBBB-S95
|--‘Idotea’ peroniiH15
|--I. rufescensH47
|--I. urotoma [=Idotea urotoma]H47
`--‘Idotea’ viridisCS77

*Type species of generic name indicated


[BBB-S95] Boubezari, K., G. Bitar & D. Bellan-Santini. 1995. Structure et organisation de trois moulières (Mytilus galloprovincialis et Perna perna) de la région d’Alger. Mésogée 54: 63–72.

[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.

[B78] Brusca, R. C. 1978. Studies on the cymothoid fish symbionts of the eastern Pacific (Crustacea: Isopoda: Cymothoidae) II. Systematics and biology of Lironeca vulgaris Stimpson 1857. Occasional Papers of the Allan Hancock Foundation New Series 2: 1–19.

[CS77] Cramp, S., & K. E. L. Simmons (eds) 1977. Handbook of the Birds of Europe, the Middle East and North Africa: The Birds of the Western Palaearctic vol. 1. Ostrich to Ducks. Oxford University Press: Oxford.

[E12] Evenhuis, N. L. 2012. Publication and dating of the Exploration Scientifique de l’Algérie: Histoire Naturelle des Animaux Articulés (1846–1849) by Pierre Hippolyte Lucas. Zootaxa 3448: 1–61.

[G20] Goldfuss, G. A. 1820. Handbuch der Naturgeschichte vol. 3. Handbuch der Zoologie pt 1. Johann Leonhard Schrag: Nürnberg.

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

[H15] Hedley, C. 1915. Presidential address. Journal and Proceedings of the Royal Society of New South Wales 49 (1): 1–77, pls 1–7.

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

[L58] Linnaeus, C. 1758. Systema Naturae per Regna Tria Naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata. Laurentii Salvii: Holmiae.

[M02] Munroe, T. A. 2002. Wrasses. Family Labridae. In: Collette, B. B., & G. Klein-MacPhee (eds) Bigelow and Schroeder’s Fishes of the Gulf of Maine 3rd ed. pp. 448–466. Smithsonian Institute Press: Washington.

[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.

[PP64] Peres, J. M., & J. Picard. 1964. Nouveau manuel de bionomie benthique de la mer Mediterranee. Recueil des Travaux de la Station Marine d’Endoume, Bulletin 31 (27): 5–137.


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