Myonia

Myonia sp., copyright Kauffy.

Belongs within: Bivalvia.

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

Characters (from Cox et al. 1969): Shell elongate, lenticular, with small umbones; tapering backward as viewed from above and side; posterior end obliquely truncate; obscure sulcus extending from beaks to ventral margin, usually bounded behind by posterior umbonal ridge; cardinal teeth lacking or obscure; margins not gaping; pallial line continuous, but radially striate; mantle within pallial line attached to shell by scattered deep pits.

<==Myonia F71
    |--M. carinata (see below for synonymy) F71
    |--M. corrugata Fletcher 1932 F71
    |--M. elongata Dana 1849 [=Maeonia elongata; incl. My. accentuata Fletcher 1932] F71
    |--M. erecta Dana 1849 F71
    |--M. morrisi (Etheridge 1919) (see below for synonymy) F71
    |--M. parallela Dun 1932 F71
    |--M. recta [=Maeonia recta] F71
    |--M. subarbritata F71
    |--M. sulcata Runnegar 1967 F71
    `--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

*Type species of generic name indicated

REFERENCES

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