Classification of Rõõmusoks 1959
Subor. †Strophomenoidea Opik 1934
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Superfm. †Plectambonitacea Jones 1928
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Subg. †Sowerbyella (Sowerbyella) Jones 1928
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†Sowerbyella (Sowerbyella) eha Opik 1930
†Sowerbyella (Sowerbyella) forumi Rõõmusoks 1959
†Sowerbyella (Sowerbyella) oepiki Rõõmusoks 1959
†Sowerbyella (Sowerbyella) raegaverensis Rõõmusoks 1959
†Sowerbyella (Sowerbyella) tenera Rõõmusoks 1959
†Sowerbyella (Sowerbyella) trivia Rõõmusoks 1959
Subg. †Sowerbyella (Viruella) Roomusoks 1959
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†Sowerbyella (Viruella) liliifera Opik 1930
†Sowerbyella (Viruella) limata Opik 1930
†Sowerbyella (Viruella) minima Rõõmusoks 1959
†Sowerbyella (Viruella) orvikui Rõõmusoks 1959
†Sowerbyella (Viruella) uhakuana Rõõmusoks 1959