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Cribroperidinium magnum
From Fensome et al., 2019:
Cribroperidinium magnum (Jain, 1977b, p.175–176, pl.4, figs.40–42) Williams et al., 1998, p.149. Holotype: Jain, 1977b, pl.4, figs.41–42; Jan du Chêne et al., 1986a, pl.122, fig.8. Originally Trichodinium, subsequently Acanthaulax, thirdly (and now) Cribroperidinium. Age: early Albian.
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Original description: [Jain, 1977b]:
Trichodinium magnus sp. nov.
Pl. 4, figs. 40-42
1973 - Gonyaulacysta serrata Cookson & Eisenack, in Jain & Taugourdeau-Lantz, p. 62, pI. 2, figs, 14-15.
1974 - Trichodinium sp., in Davey & Verdier, p. 640, pI. 92, fig. 7.
Holotype-Pl. 4, figs. 41-42; Slide no. 5049-17.
Locality - Kallakkudi Limestone Quarry II, Dalmiapuram, South India.
Horizon - Grey Shale Member, Dalmiapuram, Formation; Early Albian.
Diagnosis- Cyst oval, covered with sparsely placed processes, processes broader proximally, narrower distally, distal end peltate, closed. Transverse and longitudinal furrows distinct in holotype specimen. Archaeopyle precingular, broadly triangular. Apical horn rarely seen; tabulation indistinct (Oa, 5-6", ?c, 5-6"; 1p, 1"", 3-4S).
Measurements Holotype Range
Cyst size with 60 X 60 μm 60-70 X 60-85 μm
processes
Length of 4·8 μm 3-5 μm
processes
Width of 3 μm 3-5 μm
archaeopyle
Comparison - Trichodinium magnus sp. nov. is characterized in having well-developed processes and indication of tabulation.
The known species of the genus, viz., T. castanea (Deflandre) Clarke & Verdier, T. hirsutum Cookson, T. paucispinum Eisenack & Cookson and T. pellitum Eisenack & Cookson differ mainly in the absence of processes.
Remarks - The stratigraphic distribution of Trichodinium ranges from Upper Hauterivian to Palaeocene. Recently Cookson and Eisenack (1974) have reported it from Pebble Point Formation, S. W. Victoria, Australia.
Cribroperidinium magnum (Jain, 1977b, p.175–176, pl.4, figs.40–42) Williams et al., 1998, p.149. Holotype: Jain, 1977b, pl.4, figs.41–42; Jan du Chêne et al., 1986a, pl.122, fig.8. Originally Trichodinium, subsequently Acanthaulax, thirdly (and now) Cribroperidinium. Age: early Albian.
---------------------------------------------------------------------------------------------------
Original description: [Jain, 1977b]:
Trichodinium magnus sp. nov.
Pl. 4, figs. 40-42
1973 - Gonyaulacysta serrata Cookson & Eisenack, in Jain & Taugourdeau-Lantz, p. 62, pI. 2, figs, 14-15.
1974 - Trichodinium sp., in Davey & Verdier, p. 640, pI. 92, fig. 7.
Holotype-Pl. 4, figs. 41-42; Slide no. 5049-17.
Locality - Kallakkudi Limestone Quarry II, Dalmiapuram, South India.
Horizon - Grey Shale Member, Dalmiapuram, Formation; Early Albian.
Diagnosis- Cyst oval, covered with sparsely placed processes, processes broader proximally, narrower distally, distal end peltate, closed. Transverse and longitudinal furrows distinct in holotype specimen. Archaeopyle precingular, broadly triangular. Apical horn rarely seen; tabulation indistinct (Oa, 5-6", ?c, 5-6"; 1p, 1"", 3-4S).
Measurements Holotype Range
Cyst size with 60 X 60 μm 60-70 X 60-85 μm
processes
Length of 4·8 μm 3-5 μm
processes
Width of 3 μm 3-5 μm
archaeopyle
Comparison - Trichodinium magnus sp. nov. is characterized in having well-developed processes and indication of tabulation.
The known species of the genus, viz., T. castanea (Deflandre) Clarke & Verdier, T. hirsutum Cookson, T. paucispinum Eisenack & Cookson and T. pellitum Eisenack & Cookson differ mainly in the absence of processes.
Remarks - The stratigraphic distribution of Trichodinium ranges from Upper Hauterivian to Palaeocene. Recently Cookson and Eisenack (1974) have reported it from Pebble Point Formation, S. W. Victoria, Australia.