Cliftonia sp. A

Hints, Linda & Harper, David A. T., 2015, The Hirnantian (Late Ordovician) brachiopod fauna of the East Baltic: Taxonomy of the key species, Acta Palaeontologica Polonica 60 (2), pp. 395-420 : 407

Cliftonia sp. A

Fig. 9G.

Material.— Seven specimens embedded in rock. Porkuni Regional Stage , Kuldiga Formation , Hirnantian ( Upper Ordovician ); western Latvia. Drill core and depth (in meters) of sample intervals with brachiopods. Collection GIT 542 : Aizpute-41, 1000.3; Mežmaļi-16, 915.6; 916.1; Sturi-8, 943.0, Priekule-20, 1363.0; Riekstini-15, 860.8–860.9, Vilcini-19, 913.5 .

Remarks.—These specimens may represent a subspecies of Cliftonia cf. psittacina . They are distinctive, being small, less than 15 mm in length, with a strongly convex dorsal valve, weakly impressed sulcus with five costae, cardinal process is grooved. These specimens occur in the lowermost part of the Porkuni Stage, commonly below the first appearance of C. psittacina (in the Stirnas-18 core in the chitinozoan Spinachitina taugourdeaui Zone ; Hints et al. 2010).