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 Thyrsoporella Gümbel, 1871 – Trinocladus Raineri, 1922 Fig. 5a Remarks: The available tangential section does not allow the recognition of the lateral morphology and number of orders. We can just mention similarities to sections of Trinocladus perplexus Elliott ( Elliott, 1955 ; Deloffre and Fourcade, 1994 ) and Thyrsoporella longa Radoičić , both described from Paleocene strata of Iraq . Granier and Braik (2002) already put up for discussion the possibility that some of the forms described as Trinocladus perplexus are identical to the thyrsoporellids reported by Radoičić (1990) . If verified, it would then result in the new combination Thyrsoporella perplexa (Elliott) due to priority reason. On the other side, the existence of three orders of laterals (> Trinocladus ) has been demonstrated by Deloffre and Fourcade (1994 , transverse section in pl. 1, fig. 16) in material from Mexico excluding the belonging to Thyrsoporella (> 3 orders).