Subprionocyclus neptuni (Geinitz)
| 1993. | Subprionocyclus neptuni (Geinitz) Tanabe, K. 1993 p. 348, pl. 1, fig. 12a–c |
| Condition: | Present |
| Taxonomy: | Mollusca: Cephalopoda: Ammonitida: Ammonitina: Acanthoceratoidea: Collignoniceratidae: |
| Geologic Time: | Mesozoic: Cretaceous: Late Cretaceous: Turonian: |
| Horizon: | Middle Yezo Group: Member Mn: |
| Locality: | Japan: Hokkaido: Obira: Tappu: R 4020, middle course of the Obirashibe River.: |
| Tanabe, K., 1993: Variability and mode of evolution of the middle Cretaceous ammonite Subprionocyclus (Ammonitina: Collignoniceratidae) from Japan. Geobios, no. 15, pp. 347–357, pl. 1. (Reference No. 0695) |
| Tanabe, K., Ito, Y., Moriya, K. and Sasaki, T., 2000: Database of Cretaceous ammonite specimens registered in the Department of Historical Geology and Paleontology of the University Museum, University of Tokyo. The University Museum, The University of Tokyo, Material Reports, no. 37, pp. i–iv + 1–509. (Reference No. 0879) |
 |
| Ichikawa, T., 1995, no. 33, p. 52. |
| Tanabe et al., 2000, no. 37, p. 357. |
