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Cladopyxidium septocrispum
Cladopyxidium septocrispum, Below, 1987
Holotype: Below, 1987b, pl.18, fig.6; Fensome et al., 1993a, fig.1 - p.1333.
Locus typicus: Kanne, Albert Channel, Belgium
Stratum typicum: Late Maastrichtian
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Original description: [Below, 1987, p. 33-34]: (Translation: GSC 1988, p. 92-94):
Description:
Arrangement of vesicles\plates on the dinoflagellate amphiesma cop, pop, cap, 4", 4a, 7"", 7c, 6""", 2"""", as, FM subdivided into several periflagellar areae, ls, rs, ps; pentagonal 1"""" and hexagonal 2"""" partiform; omegaform ps very large; adelopore on suture 1"/4"; tegulation 6*, 4**, 4***, 2**** (SP), 7c, 4*, 4**, 3*** (SB); primtegulate epithecal series connected sinistrally with as; growth of thecal plates peridinoidal.
Cyst habit proximochorate, acavate, ovaloidal, hypocyst twice as long as epicyst, equatorial section circular, size small; wall composed of thin pedium and thin, spongy luxuria which closes distally into a tegillum with a smooth surface, the tegillum perforated by peniareate rows of pores; the luxuriate tegillum forms finate, smooth-walled, distally level septa equal in height to 1/6 of the diameter of the cyst, often with T-shaped distal expansions and central longitudinal furrows, shagreenate and also covered with granules; areation formula XPR/cop, pop NR cap/cap, 4", 7"", 7c, 6""", 2"""", as, FM, ls, ps; cop minute, circular and surrounded by an annular pop, cap generally not reflected; 4 apicals, steno VII 1" (V), small VII2" (DL), small VI 3" (VR), steno V 4" (VVR); 4 small anterior intercalaries, caroidal 1a (LDL), deltaform inverse-camerate 2a (DL), deltaform fastigiate 3a (DDR), deltaform inverse-camerate 4a (R); 7 precingulars, quasi- trigonal IV-nE 1"" (VVL), anteriorly bigeniculate VI-nE 2"" (LVL), anteriorly geniculate V-nE 3"" (DL), anteriorly geniculate V-nE 4"" (D), anteriorly geniculate V-nE 5"" (DR), latiform, anteriorly geniculate V-nE 6"" (VR), small anteriorly geniculate V-nE 7"" (VVR); cingulum weakly helicoid levorotatory, heptapartite with latiform 1c to 6c and iso-fastigiate 7c; 6 postcingulars, posteriorly linear V-nE 1""" (VVL), posteriorly linear IV-nE 2""" (LVL), posteriorly geniculate V-nE 3""" (LDL), posteriorly linear IV-nE 4""" (D), posteriorly linear IV-nE 5""" (DR), posteriorly linear V-nE 6""" (VR); 2 antapicals partiform, V 1"""" descending towards VL and VI 2"""" descending towards R, sulcus comprising small VI as, small, rounded FM subdivided into several area, small V ls and large steno omegaform VI ps; archaeopyle apical, PR + 2" + 3"; operculum foederate, secate, general opercular formula (PR + 2" + 3")s.
Dimensions:
of holotype: length 25 microns, breadth 25 microns, thickness 25 microns.
Remarks:
the characteristic feature of this species is the septa with their distal edges dusted with granules. The thecal plates grew on all margins in the peridinoidal fashion. This is indicated by the pores forming peniareate rings in the tegillum all around each area; they reflect trichocyst pores (see Phanerodinium carinatum). However, overlapping of thecal plates is not reflected.
Holotype: Below, 1987b, pl.18, fig.6; Fensome et al., 1993a, fig.1 - p.1333.
Locus typicus: Kanne, Albert Channel, Belgium
Stratum typicum: Late Maastrichtian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Below, 1987, p. 33-34]: (Translation: GSC 1988, p. 92-94):
Description:
Arrangement of vesicles\plates on the dinoflagellate amphiesma cop, pop, cap, 4", 4a, 7"", 7c, 6""", 2"""", as, FM subdivided into several periflagellar areae, ls, rs, ps; pentagonal 1"""" and hexagonal 2"""" partiform; omegaform ps very large; adelopore on suture 1"/4"; tegulation 6*, 4**, 4***, 2**** (SP), 7c, 4*, 4**, 3*** (SB); primtegulate epithecal series connected sinistrally with as; growth of thecal plates peridinoidal.
Cyst habit proximochorate, acavate, ovaloidal, hypocyst twice as long as epicyst, equatorial section circular, size small; wall composed of thin pedium and thin, spongy luxuria which closes distally into a tegillum with a smooth surface, the tegillum perforated by peniareate rows of pores; the luxuriate tegillum forms finate, smooth-walled, distally level septa equal in height to 1/6 of the diameter of the cyst, often with T-shaped distal expansions and central longitudinal furrows, shagreenate and also covered with granules; areation formula XPR/cop, pop NR cap/cap, 4", 7"", 7c, 6""", 2"""", as, FM, ls, ps; cop minute, circular and surrounded by an annular pop, cap generally not reflected; 4 apicals, steno VII 1" (V), small VII2" (DL), small VI 3" (VR), steno V 4" (VVR); 4 small anterior intercalaries, caroidal 1a (LDL), deltaform inverse-camerate 2a (DL), deltaform fastigiate 3a (DDR), deltaform inverse-camerate 4a (R); 7 precingulars, quasi- trigonal IV-nE 1"" (VVL), anteriorly bigeniculate VI-nE 2"" (LVL), anteriorly geniculate V-nE 3"" (DL), anteriorly geniculate V-nE 4"" (D), anteriorly geniculate V-nE 5"" (DR), latiform, anteriorly geniculate V-nE 6"" (VR), small anteriorly geniculate V-nE 7"" (VVR); cingulum weakly helicoid levorotatory, heptapartite with latiform 1c to 6c and iso-fastigiate 7c; 6 postcingulars, posteriorly linear V-nE 1""" (VVL), posteriorly linear IV-nE 2""" (LVL), posteriorly geniculate V-nE 3""" (LDL), posteriorly linear IV-nE 4""" (D), posteriorly linear IV-nE 5""" (DR), posteriorly linear V-nE 6""" (VR); 2 antapicals partiform, V 1"""" descending towards VL and VI 2"""" descending towards R, sulcus comprising small VI as, small, rounded FM subdivided into several area, small V ls and large steno omegaform VI ps; archaeopyle apical, PR + 2" + 3"; operculum foederate, secate, general opercular formula (PR + 2" + 3")s.
Dimensions:
of holotype: length 25 microns, breadth 25 microns, thickness 25 microns.
Remarks:
the characteristic feature of this species is the septa with their distal edges dusted with granules. The thecal plates grew on all margins in the peridinoidal fashion. This is indicated by the pores forming peniareate rings in the tegillum all around each area; they reflect trichocyst pores (see Phanerodinium carinatum). However, overlapping of thecal plates is not reflected.