Fottea 2020, 20(2):112-120 | DOI: 10.5507/fot.2020.001

Majewskaea gen. nov. (Bacillariophyta), a new marine benthic diatom genus from the Adriatic Sea

Bart Van de Vijver1,2, Käthe Robert1,2, Andrzej Witkowski3, Suncica Bosak4
1 Meise Botanic Garden, Research Department, Nieuwelaan 38, 1860 Meise, Belgium; *corresponding author: bart.vandevijver@plantentuinmeise.be
2 University of Antwerp, Department of Biology - ECOBE, Universiteitsplein 1, 2610 Wilrijk, Belgium
3 Institute of Marine and Environmental Sciences, University of Szczecin, 70-383 Szczecin, Poland
4 Department of Biology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, 10000 Zagreb, Croatia

During a survey of the diatom flora attached to carapaces of loggerhead sea turtles (Caretta caretta) from the Adriatic Sea, a large population of an unknown marine achnanthoid species was observed that could not be assigned to any of the currently described monoraphid diatom genera. Detailed morphological analysis based on scanning electron microscopy observations and comparison with a large number of monoraphid genera such as Madinithidium, Scalariella, Kolbesia and Karayevia, resulted in the description of the new benthic marine genus Majewskaea gen. nov. with the newly described Majewskaea istriaca sp. nov. as generitype. The new genus is characterized by a sternum valve showing a clear recurving ridge surrounding the entire valve margin, the presence of macroareolae closed internally by perforated hymenes, separated by a longitudinal hyaline area, a well-developed sternum and vestigial raphe slits. The raphe valve has a simple straight raphe with bent terminal fissures, a very fine striation pattern composed of macroareolae cut in two by a longitudinal hyaline zone, and a very shallow mantle. The new genus is illustrated using both LM and SEM observations and compared with other resembling marine and brackish Planothidium monoraphid species.

Keywords: Adriatic Sea, marine diatoms, Majewskaea, sea turtles, new genus

Received: December 19, 2019; Accepted: April 6, 2020; Prepublished online: August 24, 2020; Published: October 14, 2020  Show citation

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Van de Vijver, B., Robert, K., Witkowski, A., & Bosak, S. (2020). Majewskaea gen. nov. (Bacillariophyta), a new marine benthic diatom genus from the Adriatic Sea. Fottea, 20(2), 112-120. doi: 10.5507/fot.2020.001
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