Pennales


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Pennales

[pə′nā·lēz]
(botany)
An order of diatoms (Bacillariophyceae) in which the form is often circular, and the markings on the valves are radial.
References in periodicals archive ?
Tambien es comun que la mayoria de las morfoespecies de diatomeas registradas sean de la forma pennales, ya que comparada con las centricas se encuentran morfologicamente mejor adaptadas.
We collected 66 chironomid species and morphospecies belonging to the subfamilies Chironominae, Orthocladiinae and Tanypodinae (Table 2), 282 diatom species that belong to the orders Centrales and Pennales (Table 3), 51 cladoceran species belonging to the orders Anompoda and Ctenopoda, six copepod species (Calanoida), and 29 ostracode species (Podocopina, Table 4).
The finding of a higher number of Bacillariophyceae after the waterfalls, mainly in the order Pennales, typically benthic organisms, indicates a strong influence of the current in this sampled section (Train et ah, 2000).
Bacillariophyceae, Order Pennales, presented Gomphonema and Eunotia as the most representative genera regarding the number of taxa.
Rhizosoleniaceae Rhizosolenia eriensis (Smith) Rhizosolenia gracilis (Smith) Pennales Achnanthaceae Achnanthes lanceolata (Breb) Bacillariaceae Nitzschia palea (Kuetz) Nitzschia vermicularis (Kuetz) Eunotiaceae Eunotia sp.
En unos pocos ejemplares se observaron clorofilas filamentosas y diatomeas Pennales.
Discotella is dominant in oligotrophic environments with great availability of light and a low Si:P ratio, if compared to other diatom groups, such as the Pennales.
Las diatomeas pennales dominaron ampliamente en las muestras, seguidas de las diatomeas centricas, dinoflagelados, cocolitoforidos y cianobacterias.