Spinidinium pulchrum (Benson, 1976) Lentin and Williams, 1977

Originally Deflandrea, subsequently Spinidinium, thirdly Magallanesium, fourthly (and now) Spinidinium? Questionable assignment: Sluijs et al. (2009, p.48), who retained the species in Spinidinium.
Holotype: Benson, 1976, pl.9, figs.4-7
Locus typicus: Round Bay, Maryland
Stratum typicum: Early Paleocene

Original diagnosis: Benson, 1976, p.194: Deflandrea pulchra
Cavate cyst, peridinoid outline with intratabularly arranged coni on periblast. Periphragm and endophragm each about 0.5 µm in thickness. Reflected tabulation 4", 3a, 7", ?c, 5""", 2"""". Apical horn with two short spines on antero-lateral margin, the spines directed anteriorly. Archeopyle intercalary (Type I/I) with posteriorly and occasionally laterally directed accessory sutures. Cingulum levorotary, offset up to 4 micra. Sulcus strongly developed, may extend up to 5 micra on epitract. Left antapical horn longer than right. Endoblast closely appressed to periblast, may protrude slightly into antapical horns.
Dimensions: Holotype: Periblast length 69 µm; width 50 µm; endoblast length 46 µm; width 46 µm; apical pericoel 13 µm.