. Bulletin of the British Museum (Natural History). 138 COCKS & RONG Tangxiang Formation (Eifelian), Luofu of Nandan, Guanxi Province, China (no interiors illustrated). Plectodonta burtonae Hamada, 1969: 5; pi. 1, figs 8, 9 from beds of Devonian age, Kampong Pahil, south of Kroh, Perak, Malaysia (no brachial interiors figures; might be chonetacean). Sowerbyella {Plectodonta) hopfi Volk, 1939: 388; fig. 1 from Lower Middle Devonian Beds, Pfeiffersberg, Steinach, Thuringia, Germany (poorly preserved specimens, but Jahnke (1971: 51) considers the species to be a junior synonym
. Bulletin of the British Museum (Natural History). 138 COCKS & RONG Tangxiang Formation (Eifelian), Luofu of Nandan, Guanxi Province, China (no interiors illustrated). Plectodonta burtonae Hamada, 1969: 5; pi. 1, figs 8, 9 from beds of Devonian age, Kampong Pahil, south of Kroh, Perak, Malaysia (no brachial interiors figures; might be chonetacean). Sowerbyella {Plectodonta) hopfi Volk, 1939: 388; fig. 1 from Lower Middle Devonian Beds, Pfeiffersberg, Steinach, Thuringia, Germany (poorly preserved specimens, but Jahnke (1971: 51) considers the species to be a junior synonym of Plectodonta (Dalejodiscus) minor). Plectodonta loilemensis Reed, 1936: 113; pi. 4, figs 16- 20 from Loilem Formation (Ludlow?), Loilem, Southern Shan States, Burma (no brachial interiors figured). Species rejected Plectodonta aknistensis Rybnikova 1967: 188; pi. 19, figs 1, 2 from L. Ludlow borehole in Latvia, USSR (assigned here to Jonesea). Plectodonta thraivensis var. divergens Reed, 1944: 216; pi. 3, figs 3, 3a from Craighead Limestone (U. Caradoc), Craighead, Girvan, Strathclyde, Scotland (transferred to Eoplectodonta (Eoplectodonta)). Plectodonta exceptionis Rybnikova, 1967: 189; pi. 19, figs 8- 12 from M. Llandovery borehole in Latvia, USSR (assigned here to Eoplectodonta (Eoplectodonta)). Plectodonta propinqua Rybnikova, 1967: 191; pi. 19, figs 3-7 from L. Llandovery borehole in Latvia, USSR (assigned here to Eoplectodonta (Ygerodiscus)). Plectodonta shiqianensis Xian, 1978: 262; pi. 96, fig. 16 from Xiushan Formation (U. Llandovery), Raochaguan, Shiqian County, NE Guizhou, China (to Mesopholidostrophia). Plectodonta sp. of Harper 1973: 51; pi. 16, figs 1, 2 from French River Formation (L. Wenlock), Cobequid Mountains, Nova Scotia, Canada (certainly Eoplectodonta). PLECTODONTA (DALEJODISCUS) Havhcek, 1961 1961 Dalejodiscus Y{dL\\\iek: AA9 1965 Plectodonta Williams: H381 pars 1967 Dalejodiscus Havh'cek: 65 1971 Plectodonta {Dalejodiscus) Jahnke: 51 Type SPECIES. Stro
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