Megadesmidae

Myonia sp., copyright Kauffy.

Belongs within: Pholadomyoida.

Myonia is a genus of burrowing bivalves known from the Upper Carboniferous to the Permian.

MegadesmidaeJB12
|--Unklesbayella geinitzi (Meek 1867)SB93
|--MegadesmusJB12
| |--M. globosus Sowerby in Mitchell 1838F71
| `--M. nobilissimus [=Edmondia nobilissima]F71
|--PyramusJB12
| |--P. barringtonensisBRW98
| |--P. ellipticus Dana 1849 [=Maeonia (Pyramia) elliptica]F71
| |--P. laevis (Sowerby in Mitchell 1838) (see below for synonymy)F71
| |--P. myiformis Dana 1849 (see below for synonymy)F71
| |--P. planus Nakazawa & Newell 1968SB93
| `--P. undatus (Dana 1849) [=Pholadomya (Platymya) undata, Myonia undata]F71
`--Myonia [Myoniinae]BRW98
|--M. carinata (see below for synonymy)F71
|--M. carinellaBRW98
|--M. corrugata Fletcher 1932F71
|--M. elongata Dana 1849 [=Maeonia elongata; incl. My. accentuata Fletcher 1932]F71
|--M. erecta Dana 1849F71
|--M. morrisi (Etheridge 1919) (see below for synonymy)F71
|--M. parallela Dun 1932F71
|--M. recta [=Maeonia recta]F71
|--M. subarbritataF71
|--M. sulcata Runnegar 1967F71
`--M. valida Dana 1849 [=Maeonia valida; incl. My. depressa Fletcher 1932]F71

Myonia carinata [=Maeonia carinata; incl. My. minor var. etheridgei Fletcher 1932, My. fragilis Dana 1849, Maeonia fragilis, Ma. carinata var. minor Etheridge 1919, Myonia minor]F71

Myonia morrisi (Etheridge 1919) [=Maeonia morrisi, Pachymyonia morrisi; incl. Myonia davidis Dun 1932, My. farleyensis Dun 1932]F71

Pyramus laevis (Sowerby in Mitchell 1838) [=Megadesmus laevis; incl. M. antiquatus Sowerby in Mitchell 1838, Pachydomus antiquatus, M. cuneatus Sowerby in Mitchell 1838]F71

Pyramus myiformis Dana 1849 [=Clarkia myiformis; incl. Maeonia axina Dana 1849, Pyramus axina, Notomya clavata M’Coy 1847, N. securiformis M’Coy 1847, Cypricardia sinuosa Dana 1847]F71

*Type species of generic name indicated

References

[BRW98] Beesley, P. L., G. J. B. Ross & A. Wells (eds) 1998. Fauna of Australia vol. 5. Mollusca: The Southern Synthesis. Part A. Australian Biological Resources Study: Canberra.

[F71] Fletcher, H. O. 1971. Catalogue of type specimens of fossils in the Australian Museum, Sydney. Australian Museum Memoir 13: 1–167.

[JB12] Johnson, M. E., & B. G. Baarli. 2012. Development of intertidal biotas through Phanerozoic time. In: Talent, J. A. (ed.) Earth and Life: Global biodiversity, extinction intervals and biogeographic perturbations through time pp. 63–128. Springer.

[SB93] Skelton, P. W., & M. J. Benton. 1993. Mollusca: Rostroconchia, Scaphopoda and Bivalvia. In: Benton, M. J. (ed.) The Fossil Record 2 pp. 237–263. Chapman & Hall: London.

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