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Fibradinium lacertum
From Fensome et al., 2019:
Fibradinium? Iacertum (Below, 1987b, p.50–51, pl.9, figs.7–10; pl.12, fig.5) Lentin and Williams, 1989, p.136. Holotype: Below, 1987b, pl.9, figs.7–10; pl.12, fig.5; Fensome et al., 1993a, figs.1–5 — p.1247. Originally Phanerodinium, subsequently (and now) Fibradinium?. Questionable assignment: Lentin and Williams (1989, p.136). Age: middle Albian.
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Translation Below, 1987: Fensome et al., 1993
Original description: Below, 1987, p.50-51: Phanerodinium lacertum
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.
Fibradinium? Iacertum (Below, 1987b, p.50–51, pl.9, figs.7–10; pl.12, fig.5) Lentin and Williams, 1989, p.136. Holotype: Below, 1987b, pl.9, figs.7–10; pl.12, fig.5; Fensome et al., 1993a, figs.1–5 — p.1247. Originally Phanerodinium, subsequently (and now) Fibradinium?. Questionable assignment: Lentin and Williams (1989, p.136). Age: middle Albian.
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Translation Below, 1987: Fensome et al., 1993
Original description: Below, 1987, p.50-51: Phanerodinium lacertum
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.