Raphidodinium deflandrei (Millioud, 1969, p.429–430, pl.2, figs.5–7) Below, 1987b, p.58. Emendations: Habib, 1973, p.52, as Druggidium deflandrei; Below, 1987a, p.58–59, as Raphidodinium deflandrei.

Now Druggidium. Originally Microdinium, subsequently (and now) Druggidium, thirdly Raphidodinium. Lentin and Williams, 1989 retained this species in Druggidium Habib, 1973.
Holotype: Millioud, 1969, pl.2, fig.5-6
Locus typicus: Angles, SE France
Stratum typicum: Barremian

Original diagnosis: Millioud 1969, p. 429: Microdinium deflandrei
A Microdinium having a rounded epitract and a somewhat rectangular hypotract. Epitract considerably smaller than hypotract; cingulum broad, weakly helicoidal. Tabulation only weakly indicated, but probably similar to that of Microdinium ornatum; sutures low, probably perforate. Wall finer vacuolar and sometimes scabrate. Archeopyle apical, open in some specimens.
Dimensions: Range: Length: 31-41 µm; Width: 20-27 µm; Length/width ratio: 1.25-1.72; width of cingulum: 3.5-5 µm. Additions: M.deflandrei is characterised by a very small epitract (in comparison with the hypotract). The antapex is flattened, giving to the hypotract a rounded rectangular outline. The cingulum is broad, slightly displaced. The very faint tabulation is probably similar to that described by Cookson and Eisenack for Microdinium ornatum. M.deflandrei has low crests (less than 1 µm), often showing a row of perforations; its wall seems sometimes vacuolar, sometimes scabrate.

Emended description: Below, 1987, p. 58
Vesicle/plate arrangement on amphiesma cop, pop, cap, 4", 4a, 7"", 7c, 6""", 2"""", as, FM subdivided into very small platelets, ls, rs, ps; pentagonal 1"""" and hexagonal 2"""" partiform; omegaform ps very large; adelopore on suture 1"/4". Cyst proximate, acavate, polyhedral, epicyst tholiform to biconical, hypocyst twice as long, steeply tentoriate, prismatic, circular to oval in equatorial section or equatorially circular but lenticular towards the antapex; size small; wall composed of thin pedium and firm, alveolate, spongy luxuria fused distally into a scabrate, shagreenate tegillum which is perforated infrequently by pores reflecting trichocyst pores; tegillum upfolded into low, distally denticulate, rigid septa along the fines, septa inclined towards the areae homologous to overlapped plates, intercalary striae reflected on the level flanks of the septa as transverse striae; paratabulation XPR, NR"/X", NRa/4a, 7"", 7c, 6""", 2"""", as, FM, Xls, Xrs, ps; PR a small apical peg, minute apical areae undifferentiated; 4 very small anterior intercalaries, caroidal 1a (DL), fatigiate 2a (D), deltaform inverse-camerate 3a (DR), V 4a (RVR); 7 precingulars, anteriorly geniculate steno V-nE 1"" (VVL), anteriorly geniculate V-nE 2"" (L), V-nE 3"" (DDL), V-nE 4"" (DDR), V-nE 5"" (R) and V-nE 6"" (VR), small anteriorly geniculate steno V-nE 7"" (VVR), finis 3""/4"" dorsal; cingulum helicoid levo-rotatory, lightly indented, heptapartite, lati 1c-5c, iso 6c, fastigiate 7c; 6 postcingulars, posteriorly linear V-nE 1""" (VVL) and IV-nE 2""" (VL), posteriorly geniculate V-nE 3""" (DL), posteriorly linear IV-nE 4""" (DDR), IV-nE 5""" (R) and V-nE 6""" (VR); 2 antapicals partiform, V 1"""" (VL), VI 2"""" (R); sulcus lightly indented on the hypocyst, paratabulation rudimentary, steno as, oval FM subdivided into very small area, very small ls and rs, large omegaform ps; archaeopyle precingular, 3""+4""; operculum solvate, secate, general opercular formula 3""(s)+4""(s).