Specimen of Mya truncata with protruded siphons, photographed by Claude Nozères.

Belongs within: Heterodonta.

The Myoidea, soft-shell clams, are a group of infaunal bivalves first recorded from the Upper Jurassic. The mostly burrowing Myidae have the shells elongate and chalky with a wide posterior gape (Cox et al. 1969).

Characters (from Cox et al. 1969): Valves elongate or ovate, subequal, porcelaneous to chalky, with thin periostracum; hinge margin mostly without teeth; ligament mainly internal; valve margins smooth; pallial sinus, with some exceptions, well developed.

<==Myoidea [Myacea]
    |--Myidae [Myacidae] GW02
    |    |--Sphenia BD86
    |    |    |--S. fragilis (Adams & Adams 1854) PP78
    |    |    `--S. rueppelli Adams 1850 [incl. Cuspidaria adenensis Jousseaume 1888] BD86
    |    `--Mya GW02
    |         |--M. arenaria Linnaeus 1767 L70
    |         |--M. priapus KBC03
    |         `--M. truncata Linnaeus 1758 L70
    `--Corbulidae GW02
         |--Bicorbula mactriformis G88
         |--Ursirivus G88
         |--Caryocorbula Gardner 1926 DK08
         |    `--C. pixidata (Tate 1887) [=Corbula pixidata] DK08
         |--Varicorbula GW02
         |    |--V. disparilis GW02
         |    `--V. speciosa (Reeve 1843) [=Corbula (Varicorbula) speciosa] PP78
         |--Notocorbula Iredale 1930 P61
         |    |--*N. vicaria P61
         |    |--N. fortisulcata (Smith 1878) MG-H11
         |    |--N. hydropica Iredale 1930 MG-H11
         |    |--N. smithiana (Brazier 1879) MG-H11
         |    `--N. stolata (Iredale 1930) MG-H11
         `--Corbula MG-H11 [incl. Anisocorbula Iredale 1930 P61]
              |--C. compressa Lea 1833 F27b
              |--C. ‘compressa’ d’Orbigny 1846 non Lea 1833 F27b
              |--C. crassa Hinds 1843 H09
              |--C. ephamilla Q72
              |--C. gibba (Olivi 1792) F27a
              |--C. humerosa [incl. C. canaliculata] F27a
              |--C. (Julicorbula) ira Dall 1908 PP78
              |--C. macgillivrayi Smith 1885 MG-H11 [=Notocorbula (*Anisocorbula) macgillivrayi P61]
              |--C. monilis Hinds 1843 H09
              |--C. nematophora Meek 1872 W77
              |--C. pumila A27
              |--C. scaphoides Hinds 1843 H09
              |--C. taitensis Lamarck 1818 H09
              |--C. tunicata Hinds 1843 H09
              |--C. verconis Finlay 1927 [=C. compressa Verco 1896 nec Lea 1833 nec d’Orbigny 1846] F27b
              `--C. zelandica (Quoy & Gaimard 1835) HS01, P61 [=Notocorbula (Anisocorbula) zelandica P61]

Nomen nudum: Corbula speighti Allan 1927 A27

*Type species of generic name indicated


[A27] Allan, R. S. 1927. The geology and palaeontology of the Lower Waihao Basin, south Canterbury, New Zealand. Transactions and Proceedings of the New Zealand Institute 57: 265–309.

[BD86] Barash, A., & Z. Danin. 1986. Further additions to the knowledge of Indo-Pacific Mollusca in the Mediterranean Sea (Lessepsian migrants). Spixiana 9 (2): 117–141.

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.

[DK08] Darragh, T. A., & G. W. Kendrick. 2008. Silicified Eocene molluscs from the Lower Murchison district, Southern Carnarvon Basin, Western Australia. Records of the Western Australian Museum 24 (3): 217-246.

[F27a] Finlay, H. J. 1927a. A further commentary on New Zealand molluscan systematics. Transactions and Proceedings of the New Zealand Institute 57: 320–485.

[F27b] Finlay, H. J. 1927b. New specific names for austral Mollusca. Transactions and Proceedings of the New Zealand Institute 57: 488–533.

[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.

[G88] Gray, J. 1988. Evolution of the freshwater ecosystem: the fossil record. Palaeogeography, Palaeoclimatology, Palaeoecology 62: 1–214.

[HS01] Hayward, B. W., A. B. Stephenson, M. S. Morley, W. M. Blom, H. R. Grenfell, F. J. Brook, J. L. Riley, F. Thompson & J. J. Hayward. 2001. Marine biota of Parengarenga Harbour, Northland, New Zealand. Records of the Auckland Museum 37: 45–80.

[H09] Hedley, C. 1909. The Marine Fauna of Queensland: Address by the President of Section D. Australasian Association for the Advancement of Science: Brisbane.

[KBC03] Kashin, I. A., E. V. Bagaveeva & S. F. Chaplygina. 2003. Fouling communities of hydrotechnical constructions in Nakhodka Bay (Sea of Japan). Russian Journal of Marine Biology 29: 267–283.

[L70] Leloup, E. 1970. Recherches sur l’ostreiculture dans le bassin de chasse d’Ostende en 1968. Bulletin de l’Institut Royal des Sciences Naturelles de Belgique 46 (6): 1–24.

[MG-H11] McEnnulty, F. R., K. L. Gowlett-Holmes, A. Williams, F. Althaus, J. Fromont, G. C. B. Poore, T. D. O’Hara, L. Marsh, P. Kott, S. Slack-Smith, P. Alderslade & M. V. Kitahara. 2011. The deepwater megabenthic invertebrates on the western continental margin of Australia (100–1100 m depths): composition, distribution and novelty. Records of the Western Australian Museum Supplement 80: 1–191.

[PP78] Poorman, F. L., & L. H. Poorman. 1978. Additional molluscan records from Bahía de Los Angeles, Baja California Norte. Veliger 20 (4): 369–374.

[P61] Powell, A. W. B. 1961. Shells of New Zealand: An illustrated handbook 4th ed. Whitcombe and Tombs Limited: Christchurch.

[Q72] Quilty, P. G. 1972. The biostratigraphy of the Tasmanian marine Tertiary. Papers and Proceedings of the Royal Society of Tasmania 106: 25–44.

[W77] White, C. A. 1877. Report upon the invertebrate fossils collected in portions of Nevada, Utah, Colorado, New Mexico, and Arizona, by parties of the expeditions of 1871, 1872, 1873, and 1874. U.S. Geographical Surveys West of the One Hundredth Meridian 4 (1): 1–219, pls 211–221.

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