Pisidium henslowanum, from here.

Belongs within: Heterodonta.

The Sphaeriidae is a family of small freshwater bivalves, first definitely recorded from the Cretaceous (Cox et al. 1969).

Characters (from Cox et al. 1969): Small to minute shells, oval or quadrate to subtriangular; shell texture thin to opaque, some forms appearing porous. Ligament partially to completely immersed (rarely external); hinge curved, narrow, with anterior and posterior lateral teeth in both valves; cardinal teeth small, not more than two, those of right valve straight or united into inverted V, of left valve wholly separate.

    |--Corneocyclas FĂ©russac 1818 F27
    |--Sphaerium GW02
    |    |--S. anderssoni ZZ88
    |    |--S. avanum TC89
    |    |--S. corneum GW02
    |    |--S. indicum TC89
    |    |--S. jeholense ZZ88
    |    |--S. montanum Tapparone Canefri 1889 TC89
    |    |--S. pujiangense ZZ88
    |    |--S. rotundum ZZ88
    |    |--S. selenginense ZZ88
    |    |--S. shouchangensis ZZ88
    |    |--S. striatinum GW02
    |    |--S. striatum GW02
    |    |--S. subplanum ZZ88
    |    `--S. yanbianense ZZ88
    `--Pisidium Pfeiffer 1821 BV86
         |  i. s.: P. henslowanum GW02
         |--P. (Pisidium) BV86
         |    |--P. cavaticum Shadin 1952 BV86
         |    |--P. ljovuschkini Starobogatov 1962 BV86
         |    `--P. subterraneum Shadin 1932 BV86
         `--P. (Neopisidium Odhner 1921) BV86
              `--P. (N.) cavernicum Mori 1938 BV86


[BV86] Bole, J., & F. Velkovrh. 1986. Mollusca from continental subterranean aquatic habitats. In Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) (L. Botosaneanu, ed.) pp. 177-208. E. J. Brill / Dr. W. Backhuys: Leiden.

Cox, L. R., N. D. Newell et al. 1969. Treatise on Invertebrate Paleontology pt N. Bivalvia vol. 2. The Geological Society of America, Inc. and The University of Kansas.

[F27] Finlay, H. J. 1927. A further commentary on New Zealand molluscan systematics. Transactions and Proceedings of the New Zealand Institute 57: 320-485.

[GW02] Giribet, G., & W. Wheeler. 2002. On bivalve phylogeny: A high-level analysis of the Bivalvia (Mollusca) based on combined morphology and DNA sequence data. Invertebrate Biology 121 (4): 271-324.

[TC89] Tapparone Canefri, T. 1889. Viaggio di Leonardo Fea in Birmania e regioni vicine. XVIII. – Molluschi terrestri e d'acqua dolce. Annali del Museo Civico di Storia Naturale di Genova, Serie 2a 7: 295-359.

[ZZ08] Zhu G.-X. & Zhou Y.-Z. 1988. Fresh-water molluscan fauna across Jurassic-Cretaceous boundary in southeast Jilin. Acta Palaeontologica Sinica 27 (6): 713-721.

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