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Fibradinium densibaculatum
Fibradiniuium? densibaculatum (Below, 1987) Lentin and Willams, 1989
Originally Phanerodinium, subsequently (and now) Fibradinium?.
At the time of the transfer, Lentin and Williams, 1989, questionably included this species in 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: 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 Ám, breadth 32 Ám, thickness 29 Ám
Originally Phanerodinium, subsequently (and now) Fibradinium?.
At the time of the transfer, Lentin and Williams, 1989, questionably included this species in 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: 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 Ám, breadth 32 Ám, thickness 29 Ám