Phanerodinium lacertum Below, 1987

Now Fibradinium?. Originally Phanerodinium, subsequently (and now) Fibradinium?.

Holotype: Below, 1987, pl.9, figs.7-10; pl.12, fig.5, Fensome et al., 1993, p.1247, figs.1-5
Locus typicus: Coastal section between Wissant and Strouane, Boulonnais, France
Stratum typicum: Middle Albian
Translation Below, 1987: Fensome et al., 1993

Original description: Below, 1987, p.50-51
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, ovaloidal, epicyst somewhat shorter than hypocyst, maximum diameter at the posterior cingular margin, equatorial section circular; size small; wall composed of thin pedium and firm, coarsefibred luxuria, fibres at close, but irregular intervals and laterally often fused to a variable height, distally expanding and anastomosing to fuse into a very irregular, perforated, patchy tegillum, areate, fines without tegillum; areation formula XPR, X"/4", 4a, 7", 7c, 6""", 2"""", Xs/as, FM, ls, rs, ps; PR unstructured, undifferentiated; 4 small apicals, steno VII 1" (V), VIII 2" (L), VIII 3" (R), steno V 4" (WR); 4 small anterior intercalaries, caroidal la (DL), fastigiate 2a (D), deltaform inverse-camerate 3a (DR), V 4a (RVR); 7 precingulars, anteriorly geniculate V-nE 1" (VVL), anteriorly geniculate VnE 2" (L), anteriorly geniculate V-nE 3" (DDL), anteriorly geniculate V-nE 4" (DDR), finis 3"/4" dorsal, anteriorly geniculate V-nE 5" (R), anteriorly geniculate V-nE 6" (VR), small anteriorly geniculate V-nE 7" (WR); cingulum very weakly helicoid, level or only shallowly indented, heptapartite, lati 1c to 6c, isofastigiate 7c; 6 postcingulars, posteriorly linear V-nE 1""" (WL), posteriorly linear IV-nE 2""" (VL), posteriorly geniculate VnE 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 with variable clarity, small as, small FM subdivided into several very small areae, small ls, small 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: Holotype: length 39 µm, breadth 31 µm, thickness 31 µm.