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Fibradinium lacertum
Fibradinium? Iacertum (Below, 1987) Lentin and Williams, 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.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: Silenus Zone, Middle Albian
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 Ám, breadth 31 Ám, thickness 31 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.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: Silenus Zone, Middle Albian
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 Ám, breadth 31 Ám, thickness 31 Ám.