BECAS
LAMEIRO RubÉn AgustÍn
artículos
Título:
Taxonomic revision of Coscinodiscus variabilis (Bacillariophyta): analysis of type material, lectotypification and transfer to the genus Actinocyclus
Autor/es:
LAMEIRO, RUBÉN A.; CEFARELLI, ADRIÁN O.; VOUILLOUD, AMELIA A.
Revista:
Phytotaxa
Editorial:
Magnolia Press
Referencias:
Lugar: Auckland; Año: 2023 vol. 626 p. 269 - 278
ISSN:
1179-3155
Resumen:
The centric diatom Coscinodiscus variabilis, described by Joaquín Frenguelli for the coastal waters of Mar del Plata City(Buenos Aires, Argentina), was examined to review and elucidate its taxonomic position. The type material contained inthe Frenguelli Collection was studied with light microscopy. The species has a particular and distinctive stellate pattern ofhyaline rays on the valve face that helps in its initial identification and exhibits a remarkable morphological variation. Thepresence of a distinctive pseudonodulus, radial sectoring and circular valves support its transfer to the genus Actinocyclusas Actinocyclus ferrarioae nom. nov. The valve morphology of A. ferrarioae is described and compared to its original description and closely related taxa. We have estimated the rimoportulae density as a morphometric character for comparingmorphologically similar Actinocyclus taxa. Since Frenguelli did not formally designate a holotype in the original description,we selected a lectotype and provide an expanded description of the species.
