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Trichodinium castanea ssp. bifurcatum
From Fensome et al., 2019:
Trichodinium castanea ssp. bifurcatum (Jain and Millepied, 1975, p.140, pl.1, figs.14–16) Schrank, 1987, p.263.
Holotype: Jain and Millepied, 1975, pl.1, fig.14; Jan du Chêne et al., 1986a, pl.121, figs.6–8.
Originally Trichodinium bifurcatum, subsequently (and now) Trichodinium castanea subsp. bifurcatum.
Age: Maastrichtian.
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Original description: [Jain and Millepied, 1975]:
Trichodinium bifurcatum sp. nov. (Pl. 1, Fig. 14-16)
Holotype - Pl. 1, Fig. 14; Slide No. 8668-7.
Type locality Bore hole no. CM-4, depth 980 metres; Senegal Basin, W. Africa.
Horizon - Maestrichtian.
Diagnosis - Shell oval to spherical, girdle narrow; apical horn madc up of three large spines with a short central rounded hump in between; longitudinal furrow present, mostly restricted to hypotheca ; shel mcmbrane spongeous, punctate, sparcely covered with short spines; spine base broader, tips blunt or bifid, both types occur together. Archaeopyle precingular, formed of one complete plate extending from apex to cingulum. Tabulation indeterminable.
Measurements
Overall shell size: holotype: 65.5 x 65.5 μm, range: 60-70 μm
girdle width: holotype: 5 μm, range: 5-7 μm
apical horn: holotype: 4 x 4 μm, range: 4-6 x 4-6 μm
spine size: holotype: 4 x 2.6 μm, range: 2-6 x 1-3 μm
Comparison - Trichodinium bifurcalum sp. nov. resembles best with T. paucispinum Eisenack & Cookson (1960) in having apical horn formed by three divergent spines, sparscly placed spines with broader base; but differs in its much smaller size, bifurcated spine types, shorter apical horn with hump like rounded projection in between three divergent spines.
Trichodinium castanea ssp. bifurcatum (Jain and Millepied, 1975, p.140, pl.1, figs.14–16) Schrank, 1987, p.263.
Holotype: Jain and Millepied, 1975, pl.1, fig.14; Jan du Chêne et al., 1986a, pl.121, figs.6–8.
Originally Trichodinium bifurcatum, subsequently (and now) Trichodinium castanea subsp. bifurcatum.
Age: Maastrichtian.
---------------------------------------------------------------------------------------------------
Original description: [Jain and Millepied, 1975]:
Trichodinium bifurcatum sp. nov. (Pl. 1, Fig. 14-16)
Holotype - Pl. 1, Fig. 14; Slide No. 8668-7.
Type locality Bore hole no. CM-4, depth 980 metres; Senegal Basin, W. Africa.
Horizon - Maestrichtian.
Diagnosis - Shell oval to spherical, girdle narrow; apical horn madc up of three large spines with a short central rounded hump in between; longitudinal furrow present, mostly restricted to hypotheca ; shel mcmbrane spongeous, punctate, sparcely covered with short spines; spine base broader, tips blunt or bifid, both types occur together. Archaeopyle precingular, formed of one complete plate extending from apex to cingulum. Tabulation indeterminable.
Measurements
Overall shell size: holotype: 65.5 x 65.5 μm, range: 60-70 μm
girdle width: holotype: 5 μm, range: 5-7 μm
apical horn: holotype: 4 x 4 μm, range: 4-6 x 4-6 μm
spine size: holotype: 4 x 2.6 μm, range: 2-6 x 1-3 μm
Comparison - Trichodinium bifurcalum sp. nov. resembles best with T. paucispinum Eisenack & Cookson (1960) in having apical horn formed by three divergent spines, sparscly placed spines with broader base; but differs in its much smaller size, bifurcated spine types, shorter apical horn with hump like rounded projection in between three divergent spines.