Cordosphaeridium microtriainum subsp. centrocarpum

"subsp. centrocarpum" (Deflandre and Cookson, 1955, p.272-273, pl.8, figs.3-4) de Coninck, 1969, p.32.  Holotype: Deflandre and Cookson, 1955, pl.8, figs.3-4; Matsuoka et al., 1997, pl.1, figs.1-6.  NOW Operculodinium centrocarpum.  Originally Hystrichosphaeridium centrocarpum, subsequently Baltisphaeridium centrocarpum (Appendix A), thirdly Cordosphaeridium centrocarpum, fourthly Cordosphaeridium tiara subsp. centrocarpum, fifthly (and now) Operculodinium centrocarpum, sixthly Cordosphaeridium microtriainum subsp. centrocarpum, seventhly Cleistosphaeridium centrocarpum.  Taxonomic junior synonyms: Operculodinium? echigoense, according to Matsuoka et al. (1997, p.22); Membranilarnacia delicata, according to Jain (1980, p.140).  Motile equivalent: Peridinium (now Protoceratium) reticulatum Claparède and Lachmann, 1859 (as Gonyaulax grindleyi Reinecke, 1967), according to Wall and Dale (1966, p.1025-1026) - however, see Head (1996b, p.1211).  Age: Miocene.Cordosphaeridium microtriainum