Classification of the family Syndielasmatidae
Fm. †Syndielasmatidae Cooper 1956
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G. †Sowerbyites Teichert 1937
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†Sowerbyites delicatus Cooper 1956
†Sowerbyites gildersleevei Cooper 1956
†Sowerbyites hami Cooper 1956
†Sowerbyites hibernicus Mitchell 1977
†Sowerbyites isotes Percival 1991
†Sowerbyites lamellosus Cooper 1956
†Sowerbyites medioseptatus Teichert 1937
†Sowerbyites subnasutus Cooper 1956
†Sowerbyites triseptatus Willard 1928
†Sowerbyites vesciseptus Percival 1979
†Sowerbyites wahringaensis Percival et al. 2001