. Bulletin of the British Museum (Natural History). 128 COCKS & RONG. Genera assigned. Anoptambonites Williams, 1962 (includ- ing Chaganella Nikitin, 1974); Aulie Nikitin & Popov, 1984; Hesperomena Cooper, 1956; Kassinella (Kassinella) Borrissiak, 1956 (including Durranella Percival, 1979); Kassinella {Tri- murellina) Mitchell, 1977. Range. U. Llanvim {Hesperomena leptellinoidea) to M. Ashgill {Kassinella moneta). ANOPTAMBONITES mUiams, 1962 Figs 107-111 1962 Anoptambonites Williams: 170 1963 Anoptambonites Roomusoks: 233 pars 1965 Anoptambonites Williams: H376 1974 Chaganell
. Bulletin of the British Museum (Natural History). 128 COCKS & RONG. Genera assigned. Anoptambonites Williams, 1962 (includ- ing Chaganella Nikitin, 1974); Aulie Nikitin & Popov, 1984; Hesperomena Cooper, 1956; Kassinella (Kassinella) Borrissiak, 1956 (including Durranella Percival, 1979); Kassinella {Tri- murellina) Mitchell, 1977. Range. U. Llanvim {Hesperomena leptellinoidea) to M. Ashgill {Kassinella moneta). ANOPTAMBONITES mUiams, 1962 Figs 107-111 1962 Anoptambonites Williams: 170 1963 Anoptambonites Roomusoks: 233 pars 1965 Anoptambonites Williams: H376 1974 Chaganella Nikitin: 65 Type species. Leptaena grayae Davidson, 1883. The type species of Chaganella is C. chaganensis Nikitin, 1974. Diagnosis. Cardinal process striated posteriorly. With ele- vated platform. Small pedicle valve muscle scars restricted by bilobed muscle boundary ridges. No pedicle valve median septum. No posterolateral tubercles in ventral valve. With chilidium. Remarks. We can find no important points of difference in the morphologies of Anoptambonites and Chaganella, al- though Nikitin (1974) did not compare them, and thus we synonymize the two genera here. Species assigned Chaganella chaganensis Nikitin, 1974: 66; pi. 6, figs 11-17 from L. Bestamak Formation (Llandeilo), Chagan River, Chinghiz Mountains, Kazakhastan, USSR. Leptaena grayae Davidson, 1883: 171; pi. 12, figs 23-25 from Craighead Limestone (U. Caradoc), Craighead, Girvan, Scotland (revised WilHams 1962: 171; pi. 16, figs 11-14, 17). Anoptambonites grayae sibirica Severgina 1984/?: 40; pi. 3, figs 6-11 from Chakirksi horizon (Ashgill), Gornoi Altai Mountains, USSR. Anoptambonites orientalis Popov, 1980fe: 149; pi. 2, figs 12-17 from Anderkenski horizon (U. Llandeilo-L. Caradoc), Anderken-Akchok, Chu-Ili Mountains, Kazakhstan, USSR. Anoptambonites cf. A. grayae of Ross & Dutro 1966: 12; pi. 2, figs 1, 3, 5, 7, 9 from beds of Caradoc age, Hard Luck Creek, Alaska, USA. Anoptambonites sp. of Mitchell 1977
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