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Microdinium granocarinatum
Microdinium granocarinatum (Below, 1987) Lentin and Williams, 1989
Originally Phanerodinium, subsequently (and now) Microdinium.
Holotype: Below, 1987, pl.16, figs.7,10,15; Fensome et al., 1993, p.1219, figs1,4,6
Locus typicus: Pit IV, Misburg, Germany
Stratum typicum: Late Campanian
Translation Below, 1987: Fensome et al., 1993
Original description: Below, 1987, p.48: Phanerodinium granocarinatum
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-finicavate, spheroidal to polyhedral-bitentoriate, epicyst somewhat smaller than hypocyst, maximum diameter at the posterior cingular margin, equatorial section circular; size small; wall composed of thin pedium, luxuria of densely packed, firm, coarse, fused granules spanned along the fines by a tegillum folded up into a broad-based, hollow, distally thickened, irregularly notched keel with the finis running along the top as a very fine suture; areation formula cop, pop, cap, 4", 4a, 7", 7c, 6""", 2"""", as, FM, ls, rs, ps; cop very small, 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" approximately dorsal, anteriorly geniculate V-nE 5" (R), anteriorly geniculate V-nE 6" (VR), small anteriorly geniculate V-nE 7" (VVR); cingulum helicoid laevorotatory, level, heptapartite, lati lc 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"""" descending towards VL, VI 2"""" towards R; sulcus level, partite, small VI as, small oval FM often 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 34 Ám, breadth 30 Ám, thickness 30 Ám.
Originally Phanerodinium, subsequently (and now) Microdinium.
Holotype: Below, 1987, pl.16, figs.7,10,15; Fensome et al., 1993, p.1219, figs1,4,6
Locus typicus: Pit IV, Misburg, Germany
Stratum typicum: Late Campanian
Translation Below, 1987: Fensome et al., 1993
Original description: Below, 1987, p.48: Phanerodinium granocarinatum
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-finicavate, spheroidal to polyhedral-bitentoriate, epicyst somewhat smaller than hypocyst, maximum diameter at the posterior cingular margin, equatorial section circular; size small; wall composed of thin pedium, luxuria of densely packed, firm, coarse, fused granules spanned along the fines by a tegillum folded up into a broad-based, hollow, distally thickened, irregularly notched keel with the finis running along the top as a very fine suture; areation formula cop, pop, cap, 4", 4a, 7", 7c, 6""", 2"""", as, FM, ls, rs, ps; cop very small, 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" approximately dorsal, anteriorly geniculate V-nE 5" (R), anteriorly geniculate V-nE 6" (VR), small anteriorly geniculate V-nE 7" (VVR); cingulum helicoid laevorotatory, level, heptapartite, lati lc 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"""" descending towards VL, VI 2"""" towards R; sulcus level, partite, small VI as, small oval FM often 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 34 Ám, breadth 30 Ám, thickness 30 Ám.