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Fibradinium densibaculatum
From Fensome et al., 2019:
Fibradiniuium? densibaculatum (Below, 1987b, p.44, pl.12, figs.4,9) Lentin and Williams, 1989, p.135. Holotype: Below, 1987b, pl.12, figs.4,9; Fensome et al., 1993a, figs.1–2 — p.1115. Originally Phanerodinium, subsequently (and now) Fibradinium?. Questionable assignment: Lentin and Williams (1989, p.135). Age: middle–late Albian.
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Translation Below, 1987: Fensome, 1993
Original description: Below, 1987, p. 44: Phanerodinium densibaculatum
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. Holotype: length 33 µm, breadth 32 µm, thickness 29 µm
Fibradiniuium? densibaculatum (Below, 1987b, p.44, pl.12, figs.4,9) Lentin and Williams, 1989, p.135. Holotype: Below, 1987b, pl.12, figs.4,9; Fensome et al., 1993a, figs.1–2 — p.1115. Originally Phanerodinium, subsequently (and now) Fibradinium?. Questionable assignment: Lentin and Williams (1989, p.135). Age: middle–late Albian.
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Translation Below, 1987: Fensome, 1993
Original description: Below, 1987, p. 44: Phanerodinium densibaculatum
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. Holotype: length 33 µm, breadth 32 µm, thickness 29 µm