Germainaia geayi Germain, 1911



Taxonomy & Nomenclature

Synonym/s: Unio geayi Germain, 1911 (original combination); Nodularia geayi Germain, 1911; Caelatura geayi Germain, 1911 (comb. nov., Haas, 1969


Transferred to a newly erected genus Germainaia by (Graf & Cummings, 2009).


Conservation Status


Last record: before 1911

IUCN RedList status: Extinct





Biology & Ecology




Lectotype: MNHN 1704



For a photograph of the shell see:



Original scientific description:

Germain, L. (1911). Les Unionidae de Madagascar. Bulletin du Muséum National d'Histoire Naturelle 17: 136-140.


Other references:

Cowie, Robert H., Régnier, Claire, Fontaine, Benoît, and Bouchet, Philippe. (2017). Measuring the Sixth Extinction: what do mollusks tell us? The Nautilus 131(1): 3-41.

Graf, Daniel L. and Cummings, Kevin S. (2021). A ‘big data’ approach to global freshwater mussel diversity (Bivalvia: Unionoida), with an updated checklist of genera and species. Journal of Molluscan Studies 87(1): eyaa034.

Van Damme, D. (2016). Germainaia geayi. The IUCN Red List of Threatened Species 2016: e.T173096A91286832. Downloaded on 03 March 2018.

Graf, Daniel L. and Cummings, Kevin S. (2009). Actual and alleged freshwater mussels (Mollusca: Bivalvia: Unionoida) from Madagascar and the Mascarenes, with description of a new genus, Germainaia. Proceedings of the Academy of Natural Sciences of Philadelphia 158(1): 221-238.

Graf, Daniel L. and Cummings, Kevin S. (2011). Freshwater mussel (Mollusca: Bivalvia: Unionoida) richness and endemism in the ecoregions of Africa and Madagascar based on comprehensive museum sampling. Hydrobiologia 678: 17-36.

Haas, F. (1969). Superfamilia Unionacea. Das Tierreich, Lief. 88. Walter de Gruyter and Co., Berlin, 663 pp.

Máiz-Tomé, L., Sayer, C. and Darwall, W. (eds.). (2018). The status and distribution of freshwater biodiversity in Madagascar and the Indian Ocean islands hotspot. Gland, Switzerland: IUCN. viii + 128 pp.


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