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Fibradinium follis
From Fensome et al., 2019:
Fibradinium follis (Below, 1987b, p.47–48, pl.9, figs.1–6) Lentin and Williams, 1989, p.135. Holotype: Below, 1987b, pl.9, figs.1–5; Fensome et al., 1993a, figs.1–5 — p.1197. Originally Phanerodinium, subsequently (and now) Fibradinium?. Questionable assignment: Lentin and Williams (1989, p.135). NIA. Age: late Bajocian–middle Callovian.
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Translation Below, 1987: Fensome et al., 1993
Original description: Below, 1987, p.47: Phanerodinium follis
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, epicyst somewhat smaller than hypocyst, without polar protuberances, maximum diameter on the anterior portion of the postcingulars; size small- wall composed of thin pedium, luxuria spongy or composed of short trabecula of uniform length at irregular intervals, fused distally into a glabrous to shagreenate tegillum, free from ornament, tegillum occasionally perforated reflecting trichocyst pores and recessed along fines; areation formula XPR/cop, pop, cap, 4’, 4a, 7’, 7c, 6’’’, 2’’’’, as, FM, ls, rs, ps; PR generally undifferentiated; 4 small apicals, steno VII 1’ (V), VIII 2’ (L), VIII 3’ (R), steno V 4’ (VVR); 4 small anterior intercalaries, caroidal 1a (DL), fastigiate 2a (D), deltaform inversecamerate 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’ dorsal, anteriorly geniculate V-nE 5’ (R), anteriorly geniculate V-nE 6’’ (VR), small anteriorly geniculate V-nE 7’ (VVR); cingulum level, weakly helicoid laevorotatory, heptapartite, lati 1c to 6c, isofastigiate 7c; 6 postcingulars, posteriorly linear V-nE 1’’’ (VVL), 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, V 1’’’’ descending towards VL, VI 2’’’’ towards R; sulcus lightly indented on the hypocyst, partite, small VI as, small oval FM subdivided into several very small areae, small V ls, small V rs, large omegaforrn VI ps bulging slightly 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 29 µm, breadth 29 µm, thickness 29 µm.
Fibradinium follis (Below, 1987b, p.47–48, pl.9, figs.1–6) Lentin and Williams, 1989, p.135. Holotype: Below, 1987b, pl.9, figs.1–5; Fensome et al., 1993a, figs.1–5 — p.1197. Originally Phanerodinium, subsequently (and now) Fibradinium?. Questionable assignment: Lentin and Williams (1989, p.135). NIA. Age: late Bajocian–middle Callovian.
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Translation Below, 1987: Fensome et al., 1993
Original description: Below, 1987, p.47: Phanerodinium follis
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, epicyst somewhat smaller than hypocyst, without polar protuberances, maximum diameter on the anterior portion of the postcingulars; size small- wall composed of thin pedium, luxuria spongy or composed of short trabecula of uniform length at irregular intervals, fused distally into a glabrous to shagreenate tegillum, free from ornament, tegillum occasionally perforated reflecting trichocyst pores and recessed along fines; areation formula XPR/cop, pop, cap, 4’, 4a, 7’, 7c, 6’’’, 2’’’’, as, FM, ls, rs, ps; PR generally undifferentiated; 4 small apicals, steno VII 1’ (V), VIII 2’ (L), VIII 3’ (R), steno V 4’ (VVR); 4 small anterior intercalaries, caroidal 1a (DL), fastigiate 2a (D), deltaform inversecamerate 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’ dorsal, anteriorly geniculate V-nE 5’ (R), anteriorly geniculate V-nE 6’’ (VR), small anteriorly geniculate V-nE 7’ (VVR); cingulum level, weakly helicoid laevorotatory, heptapartite, lati 1c to 6c, isofastigiate 7c; 6 postcingulars, posteriorly linear V-nE 1’’’ (VVL), 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, V 1’’’’ descending towards VL, VI 2’’’’ towards R; sulcus lightly indented on the hypocyst, partite, small VI as, small oval FM subdivided into several very small areae, small V ls, small V rs, large omegaforrn VI ps bulging slightly 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 29 µm, breadth 29 µm, thickness 29 µm.