DNA Taxonomy: New Aulacoseira species (Bacillariophyta) from the Argentinean Patagonia and re-examination of type material of Melosira perpusilla Frenguelli

-

Aulacoseira species(Bacillariophyta) from the Argentinean Patagonia and re-examination of type material of Melosira perpusilla Frenguelli. 


 Phytotaxa 408 (3): 161-177. 


García, M.L., Morales, E.A., Guerrero, J.M., Tremarin, P.I. & Maidana, N.I. 2019.



We present a detailed morphological analysis with light and scanning electron microscopy of two new small Aulacoseira species occurring in lacustrine sediments from small lakes in the provinces of Santa Cruz and Neuquén (Patagonia, Argentina). These species differ from similar taxa by unique combinations of characters. Aulacoseira lauquenensis sp. nov. can be differentiated by its broad collum, deep and solid ringleist and presence of short, spatulate and forked-tip spines. Aulacoseira liucoensis sp. nov. is distinguished by the presence of a marginal row of valve face areolae, straight mantle rows of coarse areolae, developed collum, protruding ringleist and conical, anchor-tip spines. Additionally, we re-examine the type material of Melosira perpusilla Frenguelli and present an analysis of its identity.

 DOI: http://dx.doi.org/10.11646/phytotaxa.408.3.2
Link: https://biotaxa.org/Phytotaxa/article/view/phytotaxa.408.3.2

Comments

Post a Comment

Thank you for your comment. Due to an increased number of spam comments, we have felt the need to moderate this section. Your comment will appear in up to 72h. Thank you for your understanding.

Kind regards

Young ISDR

Popular posts from this blog

The role of geology behind diatom communities

-
Image
Geological setting in Finland The last glaciation, approximately 10 000 years ago, eroded and deposited material leaving behind a landscape full of glacial landforms in northern Europe. These landforms include thick layers of basal tills, glaciofluvial eskers, and moraines, to name a few. The retreating glacier also left behind a multitude of lakes in Finland. These lakes are often shallow and elongated in the direction of the ice flow. A majority of the lakes are located in central-eastern Finland, called the Finnish Lake District, where a relatively coarse-grained basal till covers most of the land surface. These tills deposited under actively flowing ice lobes that flushed away the finer materials. However, in the intersection of two actively flowing ice lobes, a passive interlobate area formed. This wedge-shaped area pierces central Finland in a NW-SE direction and is characterized by fine-grained basal till. The coastal areas of Finland, on the other hand, were under water ...
Read more

Diatom(s) of the Month - November 2017: the recently-digitized Diatom New Taxon File (DNTF) at the Academy of Natural Sciences

-
Image
by Alison Minerovic* What is the “DNTF”? The Diatom New Taxon File, or “DNTF”, is a digitized card catalog of all published diatom names, along with original descriptions, images, and literature citations of taxa published since 1933. It serves as a resource for diatom scientists, taxonomists, systematists, students, and enthusiasts! Figure 1 . DNTF Homepage (from 25 September 2017). The original card catalog lives in the Diatom Herbarium at the Academy of Natural Sciences in Philadelphia (ANSP), Pennsylvania, USA. Although we no longer add physical cards to the DNTF, Herbarium staff manage and update digital “cards” through our website: http://symbiont.ansp.org/dntf/  (Fig. 1) . Why is the DNTF important? As many of you know, diatom taxonomy – names, descriptions, and classification – is continually changing. Projects like the DNTF are important for maintaining consistent taxonomy, which forms the foundation of all applied diatom research. For example, s...
Read more