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Microdinium reteinvolvatum
Microdinium? reteinvolvatum (Below, 1987) Lentin and Williams, 1989
Originally Phanerodinium, subsequently (and now) Microdinium?.
At the time of the transfer, Lentin and Williams, 1989, questionably included this species in Microdinium.
Holotype: Below, 1987, pl.12, fig.3; Fensome et al., p.1297, fig.1
Locus typicus: The coastal section between Wissant and Strouane, Boulonnais, France
Stratum typicum: Middle Albian
Translation Below, 1987: Fensome et al., 1993
Original description: Below, 1987, p.51: Phanerodinium reteinvolvatum
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, hypocyst twice as long as epicyst, equatorially circular; size small; wall composed of thin pedium and firm, spongy luxuria, surface glazed to a tegillate reticulum of variable mesh size, fines marked by narrow, deep furrows in the luxuria; 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" (VVR); 4 small anterior intercalaries, caroidal la (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" 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 1c to 6c, isofastigiate 7c; 6 postcingulars, posteriorly linear V-nE 1""" (VVL), 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 µm, breadth 34 µm, thickness 34 µm.
Originally Phanerodinium, subsequently (and now) Microdinium?.
At the time of the transfer, Lentin and Williams, 1989, questionably included this species in Microdinium.
Holotype: Below, 1987, pl.12, fig.3; Fensome et al., p.1297, fig.1
Locus typicus: The coastal section between Wissant and Strouane, Boulonnais, France
Stratum typicum: Middle Albian
Translation Below, 1987: Fensome et al., 1993
Original description: Below, 1987, p.51: Phanerodinium reteinvolvatum
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, hypocyst twice as long as epicyst, equatorially circular; size small; wall composed of thin pedium and firm, spongy luxuria, surface glazed to a tegillate reticulum of variable mesh size, fines marked by narrow, deep furrows in the luxuria; 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" (VVR); 4 small anterior intercalaries, caroidal la (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" 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 1c to 6c, isofastigiate 7c; 6 postcingulars, posteriorly linear V-nE 1""" (VVL), 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 µm, breadth 34 µm, thickness 34 µm.