Hystrichosphaeridium articulatum

"articulatum" (Wetzel in Eisenack, 1938b, p.187; text-fig.4) Pastiels, 1948, p.42.  Holotype: Eisenack, 1938b, fig.4; Eisenack, 1954b, pl.7, fig.3 (not pl.7, fig.1 as indicated in Eisenack, 1954b, p.90).  NOW Wetzeliella.  Originally (and now) Wetzeliella, subsequently Palaeoperidinium (name not validly published), thirdly Hystrichosphaeridium, fourthly Wetzeliella subgenus Wetzeliella.  Taxonomic junior synonyms: Wetzeliella echinulata, according to Costa and Downie (1979, p.40); Wetzeliella horrida, according to Stover and Evitt (1978, p.131); Rhombodinium (as Wetzeliella) coronatum, according to Costa and Downie (1979, p.43) — however, Iakovleva and Heilmann-Clausen (2010, p. 211,226) retained Rhombodinium (as Wetzeliella) coronatum; Rhombodinium pentagonum, according to Costa and Downie (1979, p.40) — however, Lentin and Williams (1981, p.244) retained Rhombodinium pentagonum; Wetzeliella hampdenensis, according to Costa and Downie (1979, p.40) — however, Lentin and Williams (1981, p.290) retained Wetzeliella hampdenensis; Wetzeliella (now Charlesdowniea) clathrata, according to Pastiels (1948, p.42) — however, this synonymy has not been generally accepted.  Age: late Eocene–early Oligocene.

Parent: Hystrichosphaeridium