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Susadinium tabulatum
From Fensome et al., 2019:
Susadinium? tabulatum (Below, 1987a, p.123,125, pl.13, figs.1–15; text-figs.66a–i) Lentin and Williams, 1989, p.359. Holotype: Below, 1987a, pl.13, figs.1,4,8,12,13; Fensome et al., 1993a, figs.1,3,5–6 — p.1365. Originally Dodekovia, subsequently (and now) Susadinium?. Questionable assignment: Lentin and Williams (1989, p.359). Age: Toarcian.
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Locus typicus: Eastern slope of Knerten Hill, near DeGeerdalen, Spitsbergen
Stratum typicum: Toarcian
Translation Below, 1987: Fensome et al., 1993
Original description: Below, 1987, p.123: Dodekovia tabulata
Arrangement of vesicles/plates on the dinoflagellate amphiesma cop, pop, cap, 5', 3a, 7''-6", 7c, 5''', 2'''', as, x, y, z; 1'''' and 2'''' located symmetrically on either side of the dorsoventral plane; growth of thecal plates peridinioid.
Cyst form acavate, ovoidal, epicyst coniform, also with minute apical protuberance, larger than the semispheroidal hypocyst, both halves separated by a shallowly to deeply indented, weakly helicoid, laevorotatory cingulum, equatorial cross-section circular; size small; wall composed of thin pedium and luxuria, luxuria limbate, low, finate, distally smooth, also forming septa with t-shaped expansions or firm ridges, thick intraareate luxuria forming very prominent platforms consisting of a peniareate septum and intraareate spongy-granular filling which usually fuses distally to form a scabrate tegillum; complete reduction of the luxuria possible; areation determined by fines, limbi, and intraareate ornaments XPR/cop, pop, cap, 5', 3a, 7'', 7c, 5''', 2'''', as, x, y, z, ps; cop very small, circular, shaped like a peg or a ring, pentagonal to horseshoe-shaped pop and small rhombic cap between 1'/5' and pop; 5 apicals, steno VI 1' (V), large VI 2' (VL), deltaform inverse-camerate 3' (DL), deltaform inverse-camerate 4' (DR), large VIII 5' (VR); 3 anterior intercalaries, linteloid la (LDL),VI or VII 2a (D), inversecamerate 3a (DR); 7 precingulars, anteriorly geniculate V-nE 1'' (VVL), anteriorly geniculate V-nE 2'' (LVL), anteriorly linear IV-nE 3'' (LDL), anteriorly geniculate V-nE 4" (DDL) or anteriorly linear 4" with a heptagonal area 2a, anteriorly geniculate V-nE 5" (DDR), finis 4"/5" dorsal, anteriorly geniculate V-nE 6" (R), anteriorly linear V-nE 7'' (VVR) only seldom connected with 1'; or anteriorly geniculate V-nE 1'', anteriorly geniculate V-nE 2'', anteriorly geniculate V-nE 3", anteriorly geniculate VnE 4'', anteriorly geniculate V-nE 5", anteriorly linear IV-nE 6"; cingulum heptaareate, helicoid, laevorotatory, dextrocamerate V 1c (V), latifastigiate 2c (VL), lati VII 3c (LDL), latifastigiate 4c (D), lati VI 5c (DR), laticamerate 6c (VR),VIII 7c (V); 5 postcingulars, V-nE 1''' (VVL), posteriorly linear IVnE 2''' (L), posteriorly geniculate V-nE 3''' (DDL), posteriorly linear IV-nE 4''' (DR), finis 3'''/4''' dorsal, posteriorly linear V-nE 5''' (VR); large V 1''''(L) and large V 2'''' (R) on either side of the antapex; sulcus from large steno VII as usually in contact with 5' and 7', small caroid field x, camerate space y, latiplanate area z, large steno VI ps; archeopyle anterior intercalary, 2a; operculum monoareate, secate, opercular formula 2a[s].
Size: Holotype: length 27 µm, breadth 22 µm, thickness 22 µm.
Susadinium? tabulatum (Below, 1987a, p.123,125, pl.13, figs.1–15; text-figs.66a–i) Lentin and Williams, 1989, p.359. Holotype: Below, 1987a, pl.13, figs.1,4,8,12,13; Fensome et al., 1993a, figs.1,3,5–6 — p.1365. Originally Dodekovia, subsequently (and now) Susadinium?. Questionable assignment: Lentin and Williams (1989, p.359). Age: Toarcian.
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Locus typicus: Eastern slope of Knerten Hill, near DeGeerdalen, Spitsbergen
Stratum typicum: Toarcian
Translation Below, 1987: Fensome et al., 1993
Original description: Below, 1987, p.123: Dodekovia tabulata
Arrangement of vesicles/plates on the dinoflagellate amphiesma cop, pop, cap, 5', 3a, 7''-6", 7c, 5''', 2'''', as, x, y, z; 1'''' and 2'''' located symmetrically on either side of the dorsoventral plane; growth of thecal plates peridinioid.
Cyst form acavate, ovoidal, epicyst coniform, also with minute apical protuberance, larger than the semispheroidal hypocyst, both halves separated by a shallowly to deeply indented, weakly helicoid, laevorotatory cingulum, equatorial cross-section circular; size small; wall composed of thin pedium and luxuria, luxuria limbate, low, finate, distally smooth, also forming septa with t-shaped expansions or firm ridges, thick intraareate luxuria forming very prominent platforms consisting of a peniareate septum and intraareate spongy-granular filling which usually fuses distally to form a scabrate tegillum; complete reduction of the luxuria possible; areation determined by fines, limbi, and intraareate ornaments XPR/cop, pop, cap, 5', 3a, 7'', 7c, 5''', 2'''', as, x, y, z, ps; cop very small, circular, shaped like a peg or a ring, pentagonal to horseshoe-shaped pop and small rhombic cap between 1'/5' and pop; 5 apicals, steno VI 1' (V), large VI 2' (VL), deltaform inverse-camerate 3' (DL), deltaform inverse-camerate 4' (DR), large VIII 5' (VR); 3 anterior intercalaries, linteloid la (LDL),VI or VII 2a (D), inversecamerate 3a (DR); 7 precingulars, anteriorly geniculate V-nE 1'' (VVL), anteriorly geniculate V-nE 2'' (LVL), anteriorly linear IV-nE 3'' (LDL), anteriorly geniculate V-nE 4" (DDL) or anteriorly linear 4" with a heptagonal area 2a, anteriorly geniculate V-nE 5" (DDR), finis 4"/5" dorsal, anteriorly geniculate V-nE 6" (R), anteriorly linear V-nE 7'' (VVR) only seldom connected with 1'; or anteriorly geniculate V-nE 1'', anteriorly geniculate V-nE 2'', anteriorly geniculate V-nE 3", anteriorly geniculate VnE 4'', anteriorly geniculate V-nE 5", anteriorly linear IV-nE 6"; cingulum heptaareate, helicoid, laevorotatory, dextrocamerate V 1c (V), latifastigiate 2c (VL), lati VII 3c (LDL), latifastigiate 4c (D), lati VI 5c (DR), laticamerate 6c (VR),VIII 7c (V); 5 postcingulars, V-nE 1''' (VVL), posteriorly linear IVnE 2''' (L), posteriorly geniculate V-nE 3''' (DDL), posteriorly linear IV-nE 4''' (DR), finis 3'''/4''' dorsal, posteriorly linear V-nE 5''' (VR); large V 1''''(L) and large V 2'''' (R) on either side of the antapex; sulcus from large steno VII as usually in contact with 5' and 7', small caroid field x, camerate space y, latiplanate area z, large steno VI ps; archeopyle anterior intercalary, 2a; operculum monoareate, secate, opercular formula 2a[s].
Size: Holotype: length 27 µm, breadth 22 µm, thickness 22 µm.