Ponticocythereis species are a discrete phylogenetic group within the Trachyleberididae that evolved in the SW Pacific and Australasian regions during the Tertiary. The presence of similar scale-like spines on the unrelated species Ponticocythereis manis Whatley & Titterton, 1981 and Trachyleberis floridus sp. nov. is presented as an example of convergent evolution.
- Received June 1, 1992.
- Accepted December 1, 1994.
- © 1996 The Micropalaeontological Society