Muelleria spauldingiae

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

Muelleria gibbula

 

Muelleria tetonensis

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - November 2015
Length Range: 29-66 µm
Width Range: 11.7-15.0 µm
Striae in 10 µm: 14-17 at valve center, 18-21 at the apices

Description

Valves are broadly lanceolate to elliptic-lanceolate in smaller specimens. Valve margins are convex and apices are cuneate. The raphe branches are straight, located between two longitudinal canals. Proximal raphe ends are unilaterally deflected within a small, elliptic central area. Striae are straight and radiate throughout. The central striae are more widely spaced than in the rest of the valve. Areolae in the central striae appear larger and more distinct than areolae in more distal striae. Under SEM, external areolae openings are lineolate and appear as apically-oriented slits. Proximal raphe ends do not enter the first row of areolae and distal raphe fissures are bifurcate with branches that separate at a wide angle.

More work is needed to determine if this taxon is conspecific with Muelleria spauldinga Kociolek 2014. The observed differences in external areolae openings (lineolate in M. spauldingiae, round in M. spauldinga) may be due to differential erosion of the external foramina. Although the maximum reported size of M. spauldinga is 48 µm long and 12 µm wide, larger valves may yet be found. Internal valve SEM views are needed for both taxa.

Nomenclatural note: The names Muelleria spauldingiana and M. spauldingiae were published for different species in January and March 2014, respectively. The epithet spauldingiana is an adjectival form based on the noun Spaulding. The epithet spauldingiae is the genitive form of the same noun. Although the use of the genitive and the adjectival form of the same word to designate two different species of the same genus should be avoided, the names are not likely to be confused and are not considered to be homonyms according to the Melbourne Code (McNeill et al. 2012, Article 53.3, Example 12).



Original Description

Basionym: Muelleria spauldingiae
Author: Bahls 2014
Length Range: 28.8-66.2 µm
Width Range: 11.7-15.0 µm
Striae in 10 µm: 14-17 at valve center, 18-21 near the apices

Original Description

Valves are elliptic to linear-elliptic in the largest specimens. Valve margins are convex and apices are obtusely rounded. Valve length 28.8-66.2 μm; valve width 11.7-15.0 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 14-17 in 10 μm at valve center, 18-21 in 10 μm at the apices.

Original Images


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

Species: Muelleria spauldingiae

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.

Kociolek, J.P., Laslandes, B., Bennett, D., Thomas, E., Brady, M. and Graeff, C. (2014). Diatoms of the United States 1: Taxonomy, Ultrastructure and Descriptions of New Species and Other Rarely Reported Taxa from Lake Sediments in the Western U.S.A. Bibliotheca Diatomologica 61, J. Cramer, Stuttgart.

McNeill J., Barrie, F.R., Buck, R., Demoulin, V., Greuter, W., Hawksworth, D.L., Herendeen, P.S., Knapp, S., Marhold, K., Prado, J., Prud'homme Van Reine, W.F., Smith, G.F., Wiersema, J.H. (2012). International Code of Nomenclature for algae, fungi, and plants (Melbourne Code) . Regnum Vegetabile 154. ISBN 978-3-87429-425-6. http://www.iapt-taxon.org/nomen/main.php

Van de Vijver, B., Zidarova, R. and Kopalová, K. (2014). New species in the genus Muelleria (Bacillariophyta) from the Maritime Antarctic Region. Fottea 14(1): 77–90.

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 spauldingiae has been collected from a small alpine tarn in the Teton Mountains of Wyoming and from a mossy pool in the Mission Mountains of Montana (photos below). These habitats lie at 9801 feet and 7940 feet elevation, respectively.

Images

Small alpine tarn in the northern Teton Range, Teton County, Wyoming: home of Muelleria spauldingiae.

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

Sample site where Muelleria spauldingiae was collected in the tarn pictured above.

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

Mossy pool in the Mission Mountains, Missoula County, Montana: type locality of Muelleria spauldingiae.

Credit/Source: Bill Agnew, Adventurers and Scientists for Conservation