Fottea, 2015 (vol. 15), issue 1

Fottea 15(1): 63-75, 2015 | 10.5507/fot.2015.006

Cyclotella paleo-ocellata, a new centric diatom (Bacillariophyta) from Lake Kinneret (Israel)

Hannah Vossel1, Jane M. Reed2, Václav Houk3, Aleksandra Cvetkoska4, Bart Van de Vijver5,6
1 Rheinische Friedrich-Wilhelms-University of Bonn, Steinmann Institute of Geology, Mineralogy & Paleontology, Nussallee 8, 53115 Bonn, Germany; Corresponding author e-mail: hvossel@uni-bonn.de
2 University of Hull, Department of Geography, Environment and Earth Sciences, Cottingham Road, Hull, HU6 7RX, United Kingdom
3 Institute of Botany, C.A.S. Dukelská 135, 379 82 Třeboň, Czech Republic
4 University of Ss Cyril and Methodius, Faculty of Natural Sciences, Institute of Biology, Arhimedova 3, 1000 Skopje, R. Macedonia
5 Botanic Garden Meise, Department of Bryophyta & Thallophyta, Nieuwelaan 38, B-1860 Meise, Belgium
6 University of Antwerp, Department of Biology, ECOBE, Universiteitsplein 1, B-2610 Wilrijk, Antwerpen, Belgium

Large, subfossil populations of an unknown centric, planktonic diatom were observed in a lake sediment core from Lake Kinneret (Israel), which is here described as Cyclotella paleo-ocellata sp. nov. The new taxon, which belongs to the Cyclotella ocellata species complex, is described and separated from other similar taxa (e.g., Cyclotella ocellata, Cyclotella kuetzingiana, Cyclotella polymorpha, Cyclotella paraocellata) based on a combination of the following morphological characters: valve diameter, number of orbiculi depressi (circular depressions), number of striae/10 µm, stria length, number and position of rimoportulae and the number of central and marginal fultoportulae. Cyclotella paleo-ocellata can be distinguished mainly by two prominent characteristics: (1) the number and the arrangement of the orbiculi depressi (4-8) which increase with the valve diameter and (2) the marginal fultoportulae, situated on each, every second or third costa. Since Cyclotella paleo-ocellata is at present only known from the subfossil bottom sediments of Lake Kinneret, its ecological preferences are inferred simply from the associated diatom flora.

Keywords: Bacillariophyta, Cyclotella paleo-ocellata, Lake Kinneret, morphology, taxonomy

Received: June 6, 2014; Accepted: November 12, 2014; Published: April 22, 2015

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