. Bulletin of the British Museum (Natural History). 1 55a 155b 156 Figs 153-156 Krzywcze, Figs X 6; Fig. 154, n. Plectodonta mariae Kozlowski, 1929, from Taina Formation, Borshchov Group (Lochkovian), Figs 153, 155 from river bank at 154, 156 from Rukhotin Valley in Rukhotin Village, both Podolia, Ukraine, USSR. Fig. 153, brachial valve interior, B 81372, atural internal mould of brachial valve, BB 65810, x 11; Fig. 155, dorsal and ventral views of a pair of conjoined valves, B 81371, X 4-5; Fig. 156, natural internal mould of brachial valve, BB 65811, x 11. Some authors, Wang (
. Bulletin of the British Museum (Natural History). 1 55a 155b 156 Figs 153-156 Krzywcze, Figs X 6; Fig. 154, n. Plectodonta mariae Kozlowski, 1929, from Taina Formation, Borshchov Group (Lochkovian), Figs 153, 155 from river bank at 154, 156 from Rukhotin Valley in Rukhotin Village, both Podolia, Ukraine, USSR. Fig. 153, brachial valve interior, B 81372, atural internal mould of brachial valve, BB 65810, x 11; Fig. 155, dorsal and ventral views of a pair of conjoined valves, B 81371, X 4-5; Fig. 156, natural internal mould of brachial valve, BB 65811, x 11. Some authors, Wang (1949) and Howe (1972), have argued that there are strongly developed accessory teeth and delthyrial thickening in Thaerodonta which distinguish it from Eochonetes, but we can find no substantial differences between them. Therefore Eochonetes is now established as a senior synonym of Thaerodonta. Species assigned Chonetes (Eochonetes) advena Reed, 1917: 915; pi. 21, figs 6- 11 from Drummuck Group (M. Ashgill), Thraive Glen, Girvan, Scotland. Thaerodonta aspera Wang, 1949: 20; pi. 11, figs 1-5 from Elgin Member of Maquoketa Formation (L. Ashgill), Orleans, Iowa, USA. Eochonetes canaliferus Havlicek, 1971: 69; pi. 20, figs 12, 13 from U. Ktaoua Formation (Ashgill), Jbel Mimount, Maidere, Morocco. Eochonetes celticus Mitchell, 1977: 88; pi. 17, figs 20-25 from Junction Beds (Caradoc-Ashgill), Pomeroy, Co. Tyrone, Northern Ireland. Thaerodonta convexa Roomusoks, 1981: 67; pi. 2, figs 1-5 from Korgessaare Formation (L. Ashgill), Paopa, Estonia, USSR. Thaerodonta dignata Wang, 1949: 22; pi. 11, figs 1-6 from L. Maquoketa shale (L. Ashgill), Clermont, Iowa, USA. Thaerodonta johnsonella Amsden, 1974: 60; pi. 23, figs 3a-e; pi. 24, figs la-u from Leemon Formation (U. Ashgill), Blue Shawnee Creek, Cape Girardeau County, Missouri, USA. Thaerodonta magna Howe, 1965: 651; pi. 82, figs 1-7 from Aleman Limestone (L. Ashgill), Hueco Mountains, Texas, USA. Thaerodonta moelsi Roomusoks, 1981: 66;
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