portrait

描述：

The epicone of this species showing the typically curved anterior horn, with its open end. The hypocone is seen extending into two asymmetric posterior horns, whose ends are pointed and closed. The circumferential flagellum (cannot be seen in the picture) lies in the well visible cingulum, a circular , equatorial groove. The longitudinal flagellum, passing through the sulcus, is seen between the posterior horns. Some of the borders between the plates of the specimen are recognizable. The complete tabulation of the species (not visible in picture) is said to consist of 16 plates, 9 on the epicone, 7 on the hypocone. The cellulose-containing plates are perforated by numerous pores, some of which discernible in the image.