Phanerodinium densibaculatum Below, 1987

Now Fibradinium?. Originally Phanerodinium, subsequently (and now) Fibradinium?.
Holotype: Below, 1987, pl 12, figs 4,9; Fensome, 1993, p.1115, figs.1-2
Locus typicus: Boursin, Boulonnais, France
Stratum typicum: Late Albian
Translation Below, 1987: Fensome, 1993

Original description: Below, 1987, p. 44
Arrangement of vesicles/plates on the dinoflagellate amphiesma cop, pop, cap, 4", 4a, 7", 7c, 6""", 2"""", as, FM subdivided into several periflagellar platelets, ls, rs, ps; pentagonal 1"""" and hexagonal 2"""" partiform; omegaform ps very large; adelopore on suture 1"/4"; growth of plates gonyaulacoid.
Cyst form proximate, acavate, spheroidal, hypocyst twice as long as epicyst, maximum diameter at the posterior cingular margin, equatorial section circular; size small; wall composed of thin pedium and rigid luxuria of densely packed, also fused, baculi, the baculi distally cauliflorate and partially fused into a granular or scabrate tectum, nonareate or fines recognizable in the luxuria as narrow, deep grooves without baculi; areation formula NR PR/X PR, NR"/4", 4a, 7", 7c, 6""", 2"""", as, FM, ls, rs, ps; PR undifferentiated; 4 small apicals, steno VII 1" (V), VIII 2" (L), VIII 3" (R), steno V 4" (VVR), or apicals not reflected; 4 small anterior intercalaries, small caroidal la (DL), fastigiate 2a (D), deltaform inverse-camerate 3a (DR), V 4a (RVR); 7 precingulars, anteriorly geniculate V-nE 1" (VVL), anteriorly geniculate V-nE 2" (L), anteriorly geniculate V-nE 3" (DDL), anteriorly geniculate V-nE 4" (DDR), finis 3"/4" characteristically dorsal, anteriorly geniculate V-nE 5" (R), anteriorly geniculate V-nE 6" (VR), small anteriorly geniculate V-nE 7" (VVR); cingulum planar or weakly helicoid laevorotatory, level or slightly indented, heptapartite, lati 1c to 6c, isofastigiate 7c; 6 postcingulars, posteriorly linear V-nE 1""" (VVL), posteriorly linear IV-nE 2""" (VL), posteriorly geniculate V-nE 3""" (DL), posteriorly linear IV-nE 4""" (DDR), posteriorly linear IV-nE 5""" (R), posteriorly linear V-nE 6""" (VR); 2 antapicals partiform, V 1"""" descending towards VL, VI 2"""" towards R; sulcus lightly indented on the hypocyst, partite, small VI as, small oval FM not, or rudimentarily, subdivided into very small areae, small V ls, small V rs, large omegaform VI ps; archeopyle apical/anterior intercalary, PR + 1" + 2" + 3" + 4" + 1a + 2a + 3a + 4a; operculum foederate, adnate, general opercular formula (PR + 1" + 2" + 3" + 4"+ 1a + 2a + 3a + 4a)[a].
Size of holotype: length 33 µm, breadth 32 µm, thickness 29 µm.