Sinuocythere n. gen. (Ostracoda, Limnocytheridae, Timiriaseviinae), a new genus of limnic ostracode from southern Tethyan Middle and Upper Jurassic

A new genus of limnic ostracode, Sinuocythere n. gen., belonging to the fam ily Limnocytheridae, subfamily Timiriaseviinae, and three new species, Sinu ocythere subsinuosa n. sp., Sinuocythere pedrogaensis n. sp. and Sinuocythe re candeeirosensis n. sp. are described. This genus belongs to the Timirias evia-Metacypris group, which first appeared at the end of the Triassic and began to diversify during the Middle Jurassic. It differs from other member s of the group by its elongate subovate carapace, slightly compressed poste rior margin, and its sinuous and posteriorly upturned dorsal margin. All the known species of this genus have a stratigraphical distribution lim ited to the Middle and early Upper Jurassic (Bathonian-Oxfordian) of the so uthern Tethyan realm (Tunisia, Morocco and Portugal). Sinuocythere has a typical euryhaline behavior, contrasting with the salini ty tolerance of living and fossil species of the genera Metacypris and Vect icypris, which are essentially limnic-oligohaline.