Selected synonymic references
Undella heros: Cleve, 1900b
Undella heros var. gaussi: Laackmann, 1910
Xystonellopsis heros: Kofoid and Campbell, 1929; Balech, 1962b; Souto, 1970a, 1979
Xystonellopsis gaussi: Kofoid and Campbell, 1929
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