Phanerodinium diatretiforme Below, 1987

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

Holotype: Below, 1987, pl.12, figs.2,7; Fensome et al., 1993, p.1123
Locus typicus: Uefte clay pit near Schermbeck, Munsterland, Germany; 6.95 m below break in slope
Stratum typicum: Rupelian, Oligocene
Translation Below, 1987: Fensome et al., 1993

Original description: Below, 1987, p.46-47
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, equatorial section circular, size small; wall composed of thin pedium and firm, spongy luxuria fused distally into a tegillum, surface a very finely meshed reticulum connecting densely arranged patches of tegillum at equal intervals, tegillum seldom recessed along the fines, generally nonareate; areation NR PR, NR", NRa, NR", NRc/Xc, NR""", NR"""", NRs/Xs; positions of apical, anterior intercalary, and 7 precingular areae recognizable only from the archeopyle sutures; cingulum level or shallowly indented and helicoid laevorotatory, sulcus level or slightly indented on the hypocyst, nonareate, only FM deepened; 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 40 µm, breadth 36 µm, thickness 36 µm.