Cribrospira paradenticulata sp. nov.

Figure 6G‒H

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Derivation of the Name. For its similarity with C. denticulata .

Material. Holotype (HPU-SDB114-2, Figure 6G) and four paratypes (Table 1).

Repository. School of Resources and Environment, Henan polytechnic University (HPU).

Type Locality and Horizon. Shuidong section, Mikhailovian (late Viséan).

Occurrence. Middle Viséan to early Serpukhovian in the Shuidong section, and early Serpukhovian in the Kacai section.

Diagnosis. Cribrospira of moderate-small size with tooth-like septa and moderate evolution rate between whorls.

Description. Test free, composed of 2‒2.5 whorls, of which, coiling initially irregular in a different plane, and the final or final 1.5 are planispiral, with a diameter (D) between 670 and 1200 μm. Wall granular, calcareous. Septa slightly directed backward, short, pointed to swollen. The evolution rate increases between whorls slowly and uniformly. Height (H) of the lumen in the final chamber is 130‒280 μm, with a low H/D ratio of 0.14‒0.29. Number of chambers is moderate, ranging in the last whorl between 9 and 11. Thickness of the wall in the last chamber is 20‒45 μm. Rudimentary cribrate aperture composed of a few holes concentrated in the lower part of the apertural face.

Remarks. The species differs from C. denticulata by a higher number of chambers for similar number of whorls, larger diameter, more rudimentary aperture, thicker wall, and the occurrence of some swollen septa. It differs from other species of the genus by the shape of the septa and the granular wall.