Hystrichosphaeridium articulatum

"articulatum" (Wetzel in Eisenack, 1938b, p.186; text-fig.4) Pastiels, 1948, p.42.  Holotype: 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: Rhombodinium (as Wetzeliella) coronatum, Rhombodinium pentagonum, Wetzeliella echinulata, and Wetzeliella hampdenensis, all according to Costa and Downie (1979, p.40,43) - however, Lentin and Williams (1981, p.290) retained Wetzeliella hampdenensis; Wetzeliella horrida, according to Stover and Evitt (1978, p.131); 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