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Spiniferella cornuta subsp. flexa
Spiniferella cornuta subsp. flexa (He Chengquan, 1991, p.151, pl.22, fig.4) Williams et al., 1998, p.566.
Originally Spiniferites cornutus subsp. flexus, subsequently (and now) Spiniferella cornuta subsp. flexa.
Holotype: He Chengquan, 1991, pl.22, fig.4.
Age: Paleocene.
Description from He Chengquan, 1991, translated by Suning Hou, 07-01-2019
Description: Body ellipse or oval, wall thickness about 2μm, two layers, the inner layer is more dense, smooth; Outer surface significantly granular. There is a long apical horn, curved, wide basally, banded, tapering distally, rod-shaped, in the middle there are a few small processes, with short bifurcation at the top. Tabulation is clear, marked by high septa as the boundary, the septa nearly smooth, 1.5-3μm high, usually higher near the process base. Processes gather at the apex, antapex and cingulum area, one type of processes is large, generally conical, with a rope-like structure, quite pliable, strongly curved, distally trifurcated; Branches bend backwards, the end are bifurcated; Processes located at the gonal positions, occasionally there are intergonal processes on the septa, thin strips, end bifurcatied. Cingulum left spiral, width 5 μm; No sulcus. Archeopyle precingular, P-type, formed by the loss of the third precingular plate. Operculum free. Body length (not including apical horn and processes) 55 μm, width 43 μm, apical horn length about 30 μm, process length 8 -15μm.
Comparison: The sub-species differs from Spiniferites cornutus var. crassifurcatus in a longer and larger apical horn, strong curved processes and significant granular-short winkled surface of the wall; It differs from S. cornutus subsp. ovalis in ellipse shape, tabulation marked by septa rather than low ridge, processes strongly curved and fibrous.
Location and stratigraphy: Wuqia County Baseburak; Qimguen fm lower part of the lower member.
Originally Spiniferites cornutus subsp. flexus, subsequently (and now) Spiniferella cornuta subsp. flexa.
Holotype: He Chengquan, 1991, pl.22, fig.4.
Age: Paleocene.
Description from He Chengquan, 1991, translated by Suning Hou, 07-01-2019
Description: Body ellipse or oval, wall thickness about 2μm, two layers, the inner layer is more dense, smooth; Outer surface significantly granular. There is a long apical horn, curved, wide basally, banded, tapering distally, rod-shaped, in the middle there are a few small processes, with short bifurcation at the top. Tabulation is clear, marked by high septa as the boundary, the septa nearly smooth, 1.5-3μm high, usually higher near the process base. Processes gather at the apex, antapex and cingulum area, one type of processes is large, generally conical, with a rope-like structure, quite pliable, strongly curved, distally trifurcated; Branches bend backwards, the end are bifurcated; Processes located at the gonal positions, occasionally there are intergonal processes on the septa, thin strips, end bifurcatied. Cingulum left spiral, width 5 μm; No sulcus. Archeopyle precingular, P-type, formed by the loss of the third precingular plate. Operculum free. Body length (not including apical horn and processes) 55 μm, width 43 μm, apical horn length about 30 μm, process length 8 -15μm.
Comparison: The sub-species differs from Spiniferites cornutus var. crassifurcatus in a longer and larger apical horn, strong curved processes and significant granular-short winkled surface of the wall; It differs from S. cornutus subsp. ovalis in ellipse shape, tabulation marked by septa rather than low ridge, processes strongly curved and fibrous.
Location and stratigraphy: Wuqia County Baseburak; Qimguen fm lower part of the lower member.