Phanerodinium balteus Below, 1987

Now Microdinium. Originally Phanerodinium, subsequently (and now) Microdinium.
Holotype: Below, 1987, pl.15, fig.11-15
Locus typicus: Strouane, Boulunnais, France
Stratum typicum: Middle-late Albian
Translation Below, 1987: Fensome et al., 1993

Original description: Below, 1987, p. 40
Vesicle/plate arrangement of amphiesma cop, pop, cap, 4", 4a, 7"", 7c, 6""", 2"""", as, FM subdivided into periflagellar platelets, ls, rs, ps; pentagonal 1"""" and hexagonal 2"""" parti- form; omegaform ps very large, adelopore on suture 1"/4". Growth of thecal plates gonyaulacoidal. Cyst proximochorate, acavate-finicavate, ovaloidal- polyhedral, tentoriate, hypocyst appr. twice as long as epicyst, maximal diameter at posterior cingular margin, equatorial section circular; size small; wall composed of thin pedium, luxuria composed of diffusely scattered, coarse granules sometimes close together and fused, which are spanned only along the fines by the carinate,
upfolded tegillum; the vertices of these hollow septa bear very long, very coarse, densely arranged but individual spinules, over which the finis runs as a fine suture; areate; paratabulation XPR/cop, pop, cap, 4", 4a, 7"", 7c, 6""", 2"""", as, FM, ls, rs, ps; cop very small, circular, surrounded by an annular pop, small planate cap (V); 4 small apicals, steno VII 1" (V), VIII 2" (L), VIII 3" (R), steno V 4", (VVR); 4 small anterior intercalar- ies, caroidal 1a (DL), fastigiate 2a (D), deltaform inverse-camerate 3a (DR), V 4a (RVR); 7 precingulars, anteriorly geniculate V-nE 1"" (VVL), V-nE 2"" (L), V-nE 3"" (DDL), V-nE 4"" (DDR), V-nE 5"" (R) and V-nE 6"" (VR), small anteriorly geniculate V-nE 7"" (VVR), finis 3""/4"" characteristic dorsal location; cingulum weakly helicoid levorotatory, not very deeply indented, heptapartite, lati 1c to 6c, iso fastigiate 7c; 6 postcingulars, posteriorly linear V-nE 1""" (VVL) and V-nE 2""" (VL), posteriorly geniculate V-nE 3""" (DL), posteriorly linear V-nE 4""" (DDR), V-nE 5""" (R) and V-nE 6""" (VR); 2 antapicals partiform, V 1"""" descending towards VL, VI 2"""" towards R; sulcus slightly indented on the hypocyst, partite, small VII as, small oval FM not, or rudimentarily, subdivided into very small areae, small V ls, small V rs, large omegaform VI ps bulging into 2""""; archaeopyle apical/anterior intercalary, PR+1"+2"+3"+4"+1a+2a+3a+4a; operculum foederate, adnate, general opecular formula (PR+1"+2"+3"+4"+1a+2a+3a+4a)a.

Dimensions of holotype: length 38µm, breath 36µm, thickness 36µm.