Muelleria tetonensis

Bahls 2014      Category: Symmetrical biraphid
BASIONYM: Muelleria tetonensis Bahls 2014

Muelleria spauldingiae

 

Navicula aitchelbee

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - November 2015
Length Range: 27-53 µm
Width Range: 8.6-11.7 µm
Striae in 10 µm: 16-20 at valve center, 20-24 at the apices

Description

Valves are broadly linear with parallel margins and obtusely rounded to cuneate apices. The raphe is straight and positioned between the two longitudinal canals. The raphe sternum fills a straight and narrow axial area, which is confluent with a somewhat wider elliptic central area. Proximal raphe ends are unilaterally deflected and terminate at the first row of areolae. Distal raphe fissures are bifurcate and the two branches separate at a wide angle. Striae are weakly curved near the valve center, otherwise straight, and radiate throughout, becoming almost parallel near the apices. Central striae are more distantly spaced that in the rest of the valve. Areolae in the central striae appear larger and more distinct than areolae in more distal striae. External areola openings are simple and round to lineolate. Lineolate openings may be oriented apically, transapically or diagonally depending on their location. Internally, proximal raphe ends are simple and terminate at a central rectelevatum. Distal raphe ends terminate in helictoglossae.



Original Description

Basionym: Muelleria tetonensis
Author: Bahls 2014
Length Range: 27.2-52.6 µm
Width Range: 8.6-11.7 µm
Striae in 10 µm: 16-20 at valve center, 20-24 near the apices.

Original Description

Valves are linear-elliptic with parallel margins and obtusely rounded to cuneate apices. Valve length 27.2-52.6 μm; valve width 8.6-11.7 μm. The raphe is straight and filiform between two thickened longitudinal ribs, which occupy a narrow axial area. Proximal raphe ends are bent to the same side within a small elliptic central area. Striae are straight and radiate throughout. Areolae in the central striae appear larger and more distinct than areolae in more distal striae. Striae number 16-20 in 10 μm at valve center, 20-24 in 10 μm at the apices.

Original Images


Cite This Page:
Bahls, L. (2015). Muelleria tetonensis. In Diatoms of the United States. Retrieved March 23, 2017, from http://westerndiatoms.colorado.edu/taxa/species/muelleria_tetonensis

Species: Muelleria tetonensis

Contributor: Loren Bahls

Reviewer: Bart Van de Vijver

Citations

Bahls, L. (2014). New diatoms from the American West–A tribute to citizen science. Proceedings of the Academy of Natural Sciences of Philadelphia 163: 61-84.

Spaulding, S.A. and Stoermer, E.F. (1997). Taxonomy and distribution of the genus Muelleria Frenguelli. Diatom Research 12: 95-113.

Spaulding, S.A., Kociolek, J.P. and Wong, D. (1999). A taxonomic and systematic revision of the genus Muelleria (Bacillariophyta). Phycologia 38: 314-341.

Van de Vijver, B., Mataloni, G., Stanish, L. and Spaulding, S.A. (2010). New and interesting species of the genus Muelleria (Bacillariophyta) from the Antarctic region and South Africa. Phycologia 49: 22-41. 10.2216/09-27.1

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Muelleria tetonensis was described from a sample of benthic algae collected near the shore of a small alpine tarn in the northern part of Grand Teton National Park, Wyoming (photos below). Also found in this sample were Muelleria gibbula and Muelleria spauldingiae.

Images

Small alpine tarn at 9801 feet elevation in the northern Teton Range, Wyoming: type locality of Muelleria tetonensis.

Credit/Source: Beverly Boynton, Adventurers and Scientists for Conservation

Sample site where Muelleria tetonensis was collected in alpine tarn pictured above.

Credit/Source: Beverly Boynton, Adventurers and Scientists for Conservation