Dissocladella compressa n. sp., a new Dasycladale (green algae) from the Upper Maastrichtian of Iran
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ORIGINAL PAPER
Dissocladella compressa n. sp., a new Dasycladale (green algae) from the Upper Maastrichtian of Iran K. Rashidi 1 & F. Schlagintweit 2 Received: 13 November 2018 / Accepted: 4 March 2019 # Saudi Society for Geosciences 2019
Abstract The new dasycladalean alga Dissocladella compressa is described from the lower part of the Tarbur Formation of SW Iran (Zagros Zone). The medium-sized representative of the genus is characterized by rather large primaries displaying slight vertical compression. It occurs in a foraminiferan-algal packstone associated with larger benthic foraminifera typically Omphalocyclus macroporus Lamarck, Loftusia sp., Siderolites cf. calcitrapoides Lamarck, and scattered corals. Associated algae include Trinocladus tripolitanus Raineri, Thyrsoporella longa Radoičić, Ovulites delicatula Elliott, accessory udoteaceans, and corallinaceans. Keywords Dasycladales . Larger benthic foraminifera . Taxonomy . Systematics
Introduction The Upper Cretaceous Tarbur Formation, named after the village of Tarbur (Fars Province), and cropping out in the SW Zagros Basin, represents a predominantly carbonate lithostratigraphic unit that contains rich microfauna and microflora associated with rudists (James and Wynd 1965). It extends from the northwest to the southeast of the Zagros Basin along the western edge of the imbricated Zagros zone, between the main Zagros Fault and the Sabzposhan Fault to the east (Alavi 2004). The Tarbur Formation overlies and interfingers (towards the southwest) with the Gurpi Formation. Microflora of the Tarbur Formation is still rather poorly known and consists almost exclusively of calcareous green algae with a clear dominance of Dasycladales. Some taxa of dasycladalean algae were illustrated in some
Editorial handling: P. Selden * F. Schlagintweit K. Rashidi [email protected] 1
Department of Geology, Yazd University, 89195-741, Yazd, Iran
2
Munich, Germany
recently published papers (Abyat et al. 2012, 2015; Afghah 2016; Afghah and Farhoudi 2012; Afghah and Yaghmour 2014; Dehghani et al. 2016; Khosrow Tehrani and Afghah 2004). These determinations, however, are dubious if not incorrect and therefore require further investigations. First results and critical revisions of the microflora of the Tarbur Formation were published recently (Rashidi et al. 2013; Schlagintweit et al. 2016c; Rashidi and Schlagintweit 2018a, 2018b). The present paper deals with the description of a new dasycladale, Dissocladella c o m p re s s a n . s p . R e p r e s e n t a t i v e s o f t h e g e n u s Dissocladella were so far not reported from the Campanian-Maastrichtian interval (see Barattolo 2002, Table 2).
Studied sections Almost all specimens of Dissocladella compressa n. sp. illustrated here are from the type locality, the Rod-Abad section (Fig. 1). More rarely, the new taxon has also observed in the nearby Mandegan section as well as the Naghan section.
Rod-Abad section (type locality) Type level of the new species of Dissocladella is located in the Rod-Abad section (Fig.
