First Record Of Calcareous Green Algae (Dasycladales, Halimedaceae) From The Paleocene Chehel Kaman Formation Of North-Eastern Iran (Kopet-Dagh Basin) Author SCHLAGINTWEIT, FELIX Lerchenauerstr. 167, 80935 Munich, Germany felix.schlagintweit@gmx.de Author RASHIDI, KOOROSH 2 Department of Geology, Yazd University, 89195 - 741 Yazd, Iran kooroshrashidi@yazd.ac.ir Author MOSAVINIA, ABDOLMAJID Department of Geology, Payame Noor University, Tehran, Iran, Po Box 19395 - 3697 text Acta Palaeontologica Romaniae 2021 2021-01-18 17 1 51 64 http://dx.doi.org/10.35463/j.apr.2021.01.06 journal article 10.35463/j.apr.2021.01.06 1842-371x 10520821 Cymopolia mayaense Johnson & Kaska, 1965 Figs. 3 c-d, 8a-e, g-h *1965 Cymopolia mayaense n. sp. – Johnson and Kaska, p. 83-85, pl. 18, figs. 1-4. 2013 Cymopolia mayaense Johnson and Kaska – Granier in Granier et al., p. 283, Fig. 3.1-4 , pl. 4, figs. d-f, pl. 5, figs. a-i, pl. 6, figs. a-c, pl. 7, figs a-f, pl. 8, fig. e (with synonymy). Fig. 5 Thyrsoporella / Trinocladus , tangential section ( c ), Uteria aff. merienda (Elliott) ( b ), oblique longitudinal section from Paleocene carbonates of the Chehel Kaman Formation, northeastern Iran. Thin-sections: Nf 13 ( a ), NF 4 ( b ). Remarks: C. mayaense represents a species showing a rather wide variability of article morphology and range of biometric data. The type-material of the Johnson collection has been recently revised by Granier in Granier et al. (2013) . Characteristics of the Iranian specimens are a smooth inner surface, comparably small ovoid sporangia surrounded by 4 to 5 secondary laterals ( Fig. 8 c-e, h). Most specimens are represented by cylindrical segments (length up to 4.0 mm; diameter up to 0.9 mm ). The primary laterals bearing numerous fertile ampullae at the distal end are shorther than the secondaries. In some samples, C . cf. mayaense shows an assemblage with the calcareous benthic foraminifera Rahaghia khorassanica (Rahaghi) ( Fig. 3c , 8g ).