Gibbosula crassa (Wood, 1815)

Trai Cóc Dày

Taxonomy & Nomenclature

Synonyms: Mya crassa W. Wood, 1815 (basionym); Lamprotula crassa (Wood, 1815); Unio (Quadrula) mansuyi Dautzenberg & H. Fischer, 1908

Conservation Status

Last record: 1990's (Do, 2011, 2013)

Since Rediscovered (taxonomically) [by implication] (Richter, 2012; Graf & Cummings, 2025)

IUCN RedList status: Critically Endangered (Possibly Extinct)

Was considered a Missing (= possibly Extinct) Vietnamese endemic by (Do, 2011, 2013; Cowie et al., 2017), with a last record sometime in the 1990's (Do, 2011, 2013). While the synonymy of Lamprotula mansuyi under Gibbosula crassa has been disputed over the last half century (Richter, 2012; Graf & Cummings, 2025), but is today widely accepted and thus G. crassa is undopubtedly extant after being considered possibly Extinct.

Distribution & Habitat

China & Bang River, Cao Bang Province, northern Vietnam

Biology & Ecology

Hypodigm

Media

References

Original scientific description:

Wood, W. (1815). General conchology or a description of shells, arranged according to the Linnean system. London, John Booth. Vol. 1, lxi + 7 + 246 pp., 60 pl.

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.

Dautzenberg, P. and Fischer, H. (1908). Liste des Mollusques récoltés par M. Mansuy en Indo-Chine et description d'espèces nouvelles. II. Journal de Conchyliologie 56 (3): 169-217, pls 4-8.

Do, V. (2011). Lamprotula crassa. The IUCN Red List of Threatened Species 2011: e.T171843A6806433. https://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T171843A6806433.en. Accessed on 04 July 2025.

Do, V. (2013). Lamprotula crassa. The IUCN Red List of Threatened Species 2013: e.T171843A6806433. https://dx.doi.org/10.2305/IUCN.UK.2011-1.RLTS.T171843A6806433.en. Downloaded on 25 December 2015.

Do, T. V., Tuan, L. Q. and Bogan, Arthur E. (2018). Freshwater mussels (Bivalvia: Unionida) of Vietnam: Diversity, distribution, and conservation status. Freshwater Mollusk Biology and Conservation 21: 1-18.

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.

Graf, Daniel L. and Cummings, Kevin S. (2025). The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves). MUSSEL Project Web Site, https://www.mussel-project.net/. Accessed 4 July 2025.

Haas, F. (1969). Superfamilia Unionacea. Das Tierreich 88: x, 1-663. Berlin: Walter de Gruyter & Co.

Liu, Y., Zhang, W., Wang, Y. and Wang, E. (1979). Economic fauna of China - Freshwater Mollusca. Science Press, Beijing.

McMahon, R. F. and Bogan, A. E. (2001). Mollusca: Bivalvia, pp. 331-430. In: Thorp, J. H. and Covich, A. P. (eds.). Ecology and Classification of North American Freshwater Invertebrates. San Diego, CA: Academic Press.

MolluscaBase eds. (2025). MolluscaBase. Gibbosula crassa (W. Wood, 1815). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1251081 on 2025-07-04

Richter, K. (2012). Lamprotula mansuyi. The IUCN Red List of Threatened Species 2012: e.T166252A1122985. https://dx.doi.org/10.2305/IUCN.UK.2012-1.RLTS.T166252A1122985.en. Accessed on 04 July 2025.

Simpson, Charles Torrey. (1900). Synopsis of the naiades, or pearly fresh-water mussels. Proceedings of the United States National Museum 22(1205): 501-1044, pl. 18.

Simpson, Charles Torrey. (1914). A descriptive catalogue of the naiades, or pearly fresh-water mussels. Parts I-III. Detroit, Michigan: Bryant Walker. 1540 pp.

https://extinctanimals.proboards.com/thread/23841/lamprotula-crassa

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