Xenicodinium hispidum Drugg, 1970a, p.120–121; Emendations Lentin et al., 1994, p.571 (as Sumatradinium hispidum)

Now Sumatradinium. Originally Xenicodinium, subsequently (and now) Sumatradinium.

Holotype: Drugg, 1970, figs.12–14
Locus typicus: Rupat Island, Sumatra
Stratum typicum: Middle Miocene


Original description: Drugg, 1970:
Tract flattened dorso-ventrally, rounded pentagonal in outline. Wall single layered, thin, finely granulate. Trapezoidal six sided intercalary archeopyle on the dorsal epitract. The operculum separates first on the lower edges similar to the mode of opening of Wetzeliella. The tract is ornamented by processes 3-5 µm long. These are hollow and usually pointed distally but occasionally exhibiting blunt to slightly capitate morphology. The density of process distribution is variable with some specimens having fewer processes than the illustrated examples.

Dimensions: Tract 78-91 µm high, 72-87 µm wide.

Affinities:
This species differs from Xenicodinium densispinosum Klement in being flattened rather than egg-shaped and is slightly larger. In addition, the processes are less closely spaced. The affinity o species is probably peridinioid in view of its general similarity to Wetzeliella.