| Taxa | Valve | Nº of | RP in | Areolae | Striae in 10 | Valve | Hyaline rays length | Fasciculation | Environment | References |
|---|---|---|---|---|---|---|---|---|---|---|
| *Measured on the figures in the publications | ||||||||||
| Diameter | Fascicles | 100 µm | in 10 µm | µm | face features | pattern | ||||
| (µm) | ||||||||||
| Actinocyclus | 39–57 | 6–7 | 4.1–7* | 5–6* | 8 (center) | Flat with convex | Long (cosmiodiscoid); | Parallel* | Marine | Frenguelli (1928) |
| ferrarioae | 12 (margins) | edges | not so defined | Recent | as Coscinodiscus | |||||
| Lameiro, Vouilloud | (actinocycloid) | variabilis | ||||||||
| & Cefarelli | 29–59 | 6–14 | 4.8–8.2 | 8–10 | 8–10 (center) | Flat o almost | Complete, incomplete | Parallel | This study | |
| (44.1) | 8–12 (v. | flat; with central | (¾ to ⅓ of the valve | |||||||
| margin) | depressions, | face), not clearly | ||||||||
| curving towards | defined | |||||||||
| the mantle | ||||||||||
| A. asteriscus | 20–75 | 3–4 to 16 | 3.6–4.9* | 7–10 | 18–19 | Dome-shaped | Complete* | Parallel | Marine | Wu et al. |
| (Barron) Wu, | (center) | Fossil | (2022) | |||||||
| Williams, Pheng & | 9–13 | |||||||||
| Cheng | (margin) | |||||||||
| A. kanitzii | 50–100 | 13–15* | 10.4– | 7–9 | 14* | Flat | Incomplete (¾ to ⅓ of | Radial | Lacustrine | Bradbury & Krebs |
| (Pantocsek | 11.1* | the valve face)* | Fossil | (1995) | ||||||
| & Grunow) | ||||||||||
| Schauderna | ||||||||||
| A. ingens var. | 40–86 | 10* | 7* | 3–6 | 6*(valve | Flat with central | Incomplete (half of the | Parallel | Marine | Desikachary & |
| indica Desikachary | center) | depression and | valve face)* | Extant | Prema (1987) | |||||
| & Prema | 10*(valve | rounded margins* | ||||||||
| margin) | ||||||||||
| A. nipponicus | 15–73 | 6 to 20 | 5.7–8.3* | 10–12 | 14–18* | Almost entirely | Complete, incomplete | Radial–Subparallel– | Lacustrine | Hayashi et al. |
| Hayashi, Saito- | flat with inclined | (¾ to ⅓ of the valve | Parallel (according | Fossil | (2012) | |||||
| Kato & Tanimura | mantle | face), not clearly | to valve size) | |||||||
| defined* | ||||||||||
| A. nigriniae Barron | 15–70 | 3–15 | 7–8.75* | 8 (center) | 11–12* | Flat or domed | Incomplete | Parallel | Marine | Barron |
| 12 | (¾ to ⅓ of the valve | Fossil | (2005) | |||||||
| (margin) | face)* | |||||||||
| A. podolicus | 35–57 | 11* | 5.8– | 15–17 | 14–16* | Flat with slightly | Incomplete (¾ of the | Parallel | Brackish- | Ognjanova & |
| (Missuna) | 11.9* | raised center | valve face)* | Marine | Buczko | |||||
| Koryzenko | Fossil | (2015) | ||||||||
| A. claviolus | 17–60 | 6–8* | 6.4–7.3* | 13–14 | 20* | nearly flat with | Not clearly defined * | Radial and | Lacustrine | Bradbury & Krebs |
| Bradbury & Krebs | (27–30) | raised or depressed | Subparallel | Fossil | (1995) | |||||
| center | ||||||||||
| A. tenellus | 56–70 | 8–9* | 3.6–4.5* | 6 | 18 | Nearly flat | Not clearly defined* | Parallel | Marine | Andrews |
| (Brèbisson) | Fossil | (1976) | ||||||||
| Andrews | ||||||||||