1887 Styptosphaera spumacea - Haeckel p. 87 | 1970 Styptosphaera ? spumacea - Nigrini p. 167; pl. 1, figs. 7-8 | 1979 Styptosphaera (?) spumacea - Nigrini and Moore pl. 8, figs. 6a-b | 1995 Styptosphaera (?) spumacea - Schröder-Ritzrau pl. 3, fig. 5 | 1998 Styptosphaera spumacea - Bjørklund et al. p. 131 [not figured] |
|
|
|