Conventus conventus

Conventus conventus
Conservation status
Least Concern  (IUCN 3.1) [1]
Secure  (NatureServe) [2]
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Sphaeriida
Family:	Sphaeriidae
Genus:	Conventus
Species:	C. conventus
Binomial name
Conventus conventus (Clessin, 1877)
Synonyms [3]
List Conventus (Conventus) conventus(Clessin, 1877) Conventus (Conventus) urinator(Clessin, 1877) Conventus (Kurilipisidium) iturupensisProzorova, 1997 Conventus (Kurilipisidium) occultusProzorova, 1997 Conventus (Kurilipisidium) subtilisProzorova, 1997 Cyclas erransPrime, 1869 Euglesa (Conventus) akkesiensis(Mori, 1938) Euglesa (Conventus) conventa(Clessin, 1877) Euglesa (Conventus) iturupensis(Prozorova, 1997) Euglesa (Conventus) occulta(Prozorova, 1997) Euglesa (Conventus) subtilis(Prozorova, 1997) Euglesa (Conventus) urinator(Clessin, 1877) Euglesa conventus(Clessin, 1887) Euglesa urinator(Clessin, 1877) Pisidium (Neopisidium) conventusClessin, 1877 Pisidium abditum var. abyssorumStimpson, 1874 Pisidium abortivumSterki, 1916 Pisidium abortivum exiguumSterki, 1916 Pisidium abortivum var. exiguumSterki, 1916 Pisidium abyssorumStimpson, 1898 Pisidium clessiniSurbeck, 1899 Pisidium conventusClessin, 1877 Pisidium conventus akkesienseMori, 1938 Pisidium hendersoniSterki, 1923 Pisidium imbecilleSterki, 1900 Pisidium notophthalmiSterki, 1922 Pisidium tornenseOdhner, 1908 Pisidium urinatorClessin, 1877 Pisidium urinatorClessin, 1876

Conventus conventus, the arctic-alpine pea clam, is a species of freshwater bivalve from the family Sphaeriidae.

Description

The small (2.2–2.8 mm.) shell is oval in shape and thin and fragile. It is broad and flattened (laterally compressed) with flattened umbos near the midpoint. The colour is yellowish-white and the periostracum (surface) is silky with fine, concentric striation.^{[ citation needed ]}

Ecology

C. conventus is a relict of colder climatic periods found only in deep, cold, upland lakes.^{[ citation needed ]}

Distribution and conservation status

• Germany – endangered (gefährdet) ^[4]
• Poland – vulnerable (VU) ^[5]
• Nordic countries: Faroes, Finland, Norway and Sweden (not in Denmark, Iceland) ^[6]
• Great Britain and Ireland ^[7]

References

1. Van Damme, D.; Killeen, I.; Mackie, G.; Seddon, M.B. (2017). "Euglesa conventus". IUCN Red List of Threatened Species . 2017 e.T155516A58615885. doi: 10.2305/IUCN.UK.2017-3.RLTS.T155516A58615885.en . Retrieved 27 January 2026.
2. NatureServe. "Pisidium conventus". NatureServe Explorer. Arlington, Virginia. Retrieved 27 January 2026.
3. Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O (eds.). "Conventus conventus (Clessin, 1877)". MolluscaBase. World Register of Marine Species.
4. Glöer P. & Meier-Brook C. (2003) Süsswassermollusken. DJN, pp. 134, page 109, ISBN   3-923376-02-2
5. Pisidium conventus - Polish Red Data Book of Animals
6. Kuiper, J. G. J.; Økland, K. A.; Knudsen, J.; Koli, L.; von Proschwitz, T.; Valovirta, I. (1989), "Geographical distribution of the small mussels (Sphaeriidae) in North Europe (Denmark, Faroes, Finland, Iceland, Norway and Sweden)" (PDF), Annales Zoologici Fennici, 26 (2): 73–101
7. Roy Anderson, 2005 An annotated list of the non-marine molluscs of Britain and Ireland Journal of Conchology, 38 (6): 607–637, (published 2005) .

External links

• Pisidium conventus at Animalbase taxonomy, short description, biology, status (threats)
• Polish Red Data Book