Amnicythere sp. 2

Fig. 24 i-q

Description. This species has an elongated carapace with a much wider and flattened anterior end in comparison to the posterior one. The dorsal margin is straight and pointed towards the posterior. The ventral margin shows a clear concavity at mid-length. The ornamentation is weakly pronounced and varies from finely pitted to areas that bear a reticulated pattern, mainly concentrated in the median region and posterior parts. Within the anterior half of the valve any kind of ornamentation is almost absent. In the postero – ventral part a more or less visible tubercula can be noticed that we interpret to be related to the sexual dimorphism. Medium sized conulus pores are present along the anterior-and posterior margins. The inner lamella is moderately developed in the anterior part and narrower along the posterior boarder. The hinge on the RV valve shows a long thin smooth median bar with two elongated, subdivided teeth at both ends. Dimension: L = 0,49 – 0,54 mm, H = 0,25 – 0,29 mm, the minimum sizes include juveniles too.