Distribution and morphometric analysis of Cyclostephanos andinus comb. nov., a planktonic diatom from the Central Andes

Tapia, PM; Theriot, EC; Fritz, SC; Cruces, F; rivera, p

Abstract

The taxonomic position of Cyclotella andina Theriot, Carney et Richerson, a tropical freshwater planktonic diatom originally identified from Lake Titicaca, is modified based on morphological characters. The presence of striae arranged in discrete fascicles on the valveface, coupled with the placing of fulto- and rimoportulae on the same internal costa below the position of external spines (or on the valve face / mantle region in spineless individuals), form the basis to transfer this species from the genus Cyclotella Kützing to the genus Cyclostephanos Round. Morphometric analyses of 350 valves from seven populations from three Andean lakes demonstrate a morphological continuum in fossil and modern assemblages. Principal Component Analysis (PCA) shows that three main factors characterize most of the variability in morphology. PC1 (?1 = 71.7%) is a size-related component (e.g. valve diameter); PC2 (?2 = 23.9%) is a size-free component that relates the length of biseriate to uniseriate areolae, and PC3 (?3 = 1.73%) represents the ratio between the number and distance of biseriate or uniseriate areolae. We herein propose the taxonomic transfer of Cyclotella andina as Cyclostephanos andinus comb. nov.

Más información

Título según WOS: Distribution and morphometric analysis of Cyclostephanos andinus comb. nov., a planktonic diatom from the Central Andes
Título según SCOPUS: Distribution and morphometric analysis of Cyclostephanos andinus comb. nov., a planktonic diatom from the central Andes
Título de la Revista: DIATOM RESEARCH
Volumen: 19
Número: 2
Editorial: TAYLOR & FRANCIS LTD
Fecha de publicación: 2004
Página de inicio: 311
Página final: 327
Idioma: English
Notas: ISI, SCOPUS