Triblastula quasicribrata O. Wetzel, 1961

Now Hystrichosphaeropsis. Originally Triblastula, subsequently (and now) Hystrichosphaeropsis.
Taxonomic junior synonyms: Triblastula nuda and Triblastula tubulata, both according to Marheinecke (1992, p.44); (at specific rank) Deflandrea (as Amphidiadema) rectangularis subsp. samuelsonii, according to Gocht (1976, p.322).
Contrary to the opinion of Stover and Evitt (1978, p.94), Gocht (1976, p.322) did not consider this species to be the taxonomic senior synonym of Amphidiadema rectangularis, but only the specimen identified by Kjellström (1973, p.17).

Holotype: O. Wetzel, 1961, pl.2, fig.3; Sarjeant, 1985, pl.2, fig.1; Jan du Chêne et al., 1986, pl.46, figs.9-10
Locus typicus: Baltic Cretaceous flintstones
Stratum typicum: Erratikum, ?Late Cretaceous

Original diagnosis: O. Wetzel, 1961, p.340
Central body spheroidal and spineless. Both "caps" are cylindrical-cuboidal, narrower towards the ends, especially the one ("epitheca") having a more projecting field of pore-meshes with terminal edges protruding. "Pylomes" are common.
Dimensions: ca. 100 x 50 µm.