Cassidium filosum, Wilson, 1988

Holotype: Wilson, 1988, pl.2, figs.8a–b; Fensome et al., 1996, figs.1–2, p.2125.
Locus typicus: Hawkes Bay, New Zealand
Stratum typicum: Paleocene (Teurian)

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Original description: [Wilson, 1988, p.14-15]:

Description:
Cyst spherical to subspherical, intermediate to large, with relatively thick reticulate or rugulate autophragm, and bearing short irregular filamentous intratabular processes which are usually solitary but may occasionally be joined distally.
Processes comprise widely separated filaments which arise directly from autophragm reticulum.
Paratabulation apparently gonyaulacacean, poorly defined by narrow parasutural areas devoid of ornament.
Archeopyle apical, Type tA; principal archeopyle suture zig-zag; operculum free.
Paracingulum poorly defined on dorsal surface, not usually seen on ventral surface.

Dimensions:
Holotype: overall length (including operculum) 103 µm, breadth 85 µm, length excluding processes 76 µm, breadth 68 µm, length of processes up to 15 µm.
Range: overall breadth 76(86)98 µm, breadth excluding processes 68(75)81 µm. Maximum length of processes 11-15 µm (n = 10).

Affinities:
The species differs from the type in having irregular filamentous processes which C. fragile lacks.