Reassignment of the Jurassic Todilto Limestone Ostocode Metacypris Todiltoensis Swain 1946, to Cytheridella, with notes on the phylogeny and environmental implications of this Ostracode

Abstract

-Metacypris todilroensis Swain, 1946, should be reassigned to the genus Cytheridel/a Daday, I 905, to accommodate it better in the current organization of the Limnocytheridae. This placement is based on muscle scar structure, the single sulcus and close similarity of surface ornamentation. This species represents an important link between the ancestral Lutkevichinella faunas of the Triassic and the extant genus Cwheridella. The occurrence of this ostracode in the saline to hypersaline Todilto environments can be understood in terms of readaptation of a brackish-water ostracode group and perhaps in the possible parthenogenic nature of this species.