Naslov
Observations on the diatom Navicula hedinii Hustedt (Bacillariophyceae) and its transfer to a new genus Envekadea Van de Vijver et al. gen. nov.

Autori
Gligora, Marija ; Kralj, Koraljka ; Plenković-Moraj, Anđelka ; Hinz, Friedel ; Acs, Eva ; Grigorszky, Istvan ; Cocquyt Christine ; Van de Vijver, Bart

Izvornik
European Journal of Phycology (0967-0262) 44 (2009), 1; 123-138

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Naviculaceae; Envekadea gen. nov.; Envekadea pseudocrassirostris; Envekadea hedinii; ultrastructure; taxonomy.

Sažetak
The population of an unknown naviculoid diatom from Lake Vrana in Croatia was identified as Navicula hedinii Hustedt, a species that was described in 1922 from a small lake in eastern Turkestan. This species has some similarities with Navicula pseudocrassirostris Hustedt, a marine species found in European coastal waters. Based on the ultrastructure of the two species, they can no longer be included within the taxonomical concept of Navicula s.s. Bory. Following a morphological comparison analysis of both species with genera bearing similar characters (Adlafia, Veigaludwigia, Kobayasiella, Cavinula, Stenoneis, Sellaphora, Cosmioneis), a new genus, Envekadea Van de Vijver, Gligora, Kralj & Cocquyt gen. nov. is proposed for the three species. The new genus is characterized by a sigmoid raphe course with golfclub-like terminal fissures deflected into opposite directions, by a typical areolae structure, the presence of an external velum covering the areolae and the presence of 1 chloroplast, H-shaped in valve view.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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