| Alchichica | Prasad et al. (1990) | Maidana omero (1995) | Carvalho et al. (1995) |
---|---|---|---|---|
Diameter μm | 4.9–12 | 3.5–9.5 | 3–10 | 6.9–10.6 |
Striae per 5 μm | 12–14 | 10–13 | 10 | 9–12 |
Marginal fultoportulae | every 2, 3, 4 costae (7–14 per valve) | every 3 or 7 costae (5–14 per valve) | every 3 or 7 costae | every 2, 4 costae |
Number of satellite pores of marginal fultoportulae | 2 | 2 | 2 | 2 |
Central fultoportulae | 2, rarely 3 | 1, rarely 2–3 | 1–6 | 2–6 |
Number of satellite pores of central fultoportulae | 3 | 3 | 3, occasionally 2 | 3 |
Marginal rimoportula | 1 | 1 | 1 | 1 |
Central area of external view of valve | with tangential undulations and colliculate | with tangential undulations and colliculate | with tangential undulations and colliculate | colliculate |
Silica granules in the marginal area of valve external view | with granules | with granules | without granules | with granules |