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Fibradinium squamosum
From Fensome et al., 2019:
Fibradinium? squamosum (Below, 1987b, p.54–56, pl.11, figs.1–15; pl.12, figs.1,6,11; pl.16, fig.13) Lentin and Williams, 1989, p.136. Holotype: Below, 1987b, pl.11, figs.1,3–6; Fensome et al., 1993a, figs.1,3–6 — p.1355. Originally Phanerodinium, subsequently (and now) Fibradinium?. Lentin and Williams (1993, p.222) retained this species in Fibradinium. Questionable assignment: Lentin and Williams (1989, p.136). Age: Early Oligocene.
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Translation Below, 1987: Fensome et al., 1993
Original description: Below, 1987, p.54-55: Phanerodinium squamosum
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 to ovaloidal, hypocyst twice as long as the epicyst, equatorial section circular, size small; wall composed of thin pedium and spongy luxuria fused distally into a tegillum, surface glabrous, also with a few intraareate pits or pustules arranged diffusely or parallel to the finis, reflecting trichocyst pores; fines marked by deep furrows without luxuria or by limbi rising like bulges, areae also formed as scales and directly or inversely imitating, through their own overlapping, the overlapping of thecal plates; areation formula XPR/cop, pop, cap, 4’, 4a, 7’, 7c, 6’’’, 2’’’’, as, FM, Is, rs, ps; cop minute, circular, surrounded by an annular pop, small planate cap (V); 4 small apicals, steno VII 1’ (V), VIII 2’ (L), VIII 3’ (R), steno V 4’ (WR) with porichnion on finis 4’/1’; 4 small anterior intercalaries, caroidal la (DL), fastigiate 2a (D), deltaform inversecamerate 3a (DR), V 4a (RVR); 7 precingulars, anteriorly geniculate V-nE 1’ (WL), anteriorly geniculate V-nE 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 planispiral, level, heptapartite, lati 1c to 6c, isofastigiate 7c; 6 postcingulars, posteriorly linear V-nE 1’’’ (WL), 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’’’’ (VL), VI 2’’’’ (R); sulcus level, partite, small VI as, small oval FM often subdivided into very small areae, small V Is, small V rs, large omegaform V ps bulging gently into 2’’’’; 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 36 µm, breadth 35 µm, thickness 35 µm.
Fibradinium? squamosum (Below, 1987b, p.54–56, pl.11, figs.1–15; pl.12, figs.1,6,11; pl.16, fig.13) Lentin and Williams, 1989, p.136. Holotype: Below, 1987b, pl.11, figs.1,3–6; Fensome et al., 1993a, figs.1,3–6 — p.1355. Originally Phanerodinium, subsequently (and now) Fibradinium?. Lentin and Williams (1993, p.222) retained this species in Fibradinium. Questionable assignment: Lentin and Williams (1989, p.136). Age: Early Oligocene.
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Translation Below, 1987: Fensome et al., 1993
Original description: Below, 1987, p.54-55: Phanerodinium squamosum
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 to ovaloidal, hypocyst twice as long as the epicyst, equatorial section circular, size small; wall composed of thin pedium and spongy luxuria fused distally into a tegillum, surface glabrous, also with a few intraareate pits or pustules arranged diffusely or parallel to the finis, reflecting trichocyst pores; fines marked by deep furrows without luxuria or by limbi rising like bulges, areae also formed as scales and directly or inversely imitating, through their own overlapping, the overlapping of thecal plates; areation formula XPR/cop, pop, cap, 4’, 4a, 7’, 7c, 6’’’, 2’’’’, as, FM, Is, rs, ps; cop minute, circular, surrounded by an annular pop, small planate cap (V); 4 small apicals, steno VII 1’ (V), VIII 2’ (L), VIII 3’ (R), steno V 4’ (WR) with porichnion on finis 4’/1’; 4 small anterior intercalaries, caroidal la (DL), fastigiate 2a (D), deltaform inversecamerate 3a (DR), V 4a (RVR); 7 precingulars, anteriorly geniculate V-nE 1’ (WL), anteriorly geniculate V-nE 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 planispiral, level, heptapartite, lati 1c to 6c, isofastigiate 7c; 6 postcingulars, posteriorly linear V-nE 1’’’ (WL), 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’’’’ (VL), VI 2’’’’ (R); sulcus level, partite, small VI as, small oval FM often subdivided into very small areae, small V Is, small V rs, large omegaform V ps bulging gently into 2’’’’; 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 36 µm, breadth 35 µm, thickness 35 µm.