Stauroneis kishinena
Bahls 2010 Category: Symmetrical biraphid
BASIONYM: Stauroneis kishinena Bahls 2010
LM scalebar = 10 µm = 20 pixels.
Observations
Contributor: Loren Bahls - November 2011
Length Range: 122-182 µm
Width Range: 26-33 µm
Striae in 10 µm: 11-12
Description
Valves are broadly lanceolate with rounded apices. A prominent pseudoseptum is present at each apex. The axial area is broad, about three times the width of the raphe, and becomes wider near the central area. The central area is a nearly rectangular stauros, expanding slightly near the valve margins. External raphe fissures are lateral, becoming reverse lateral and strongly curved near the large, proximal pores. Striae are radiate throughout and extend onto the valve mantles. Areolae are round, coarse and number 12-16 in 10 µm. Cells are commonly joined, face-to-face, in colonies.
Original Description
Basionym: Stauroneis kishinena
Author: Bahls 2010
Length Range: 122-182 µm
Width Range: 26-33 µm
Striae in 10 µm: 11-12
Original Description
Frustules commonly found adherent face-to-face in short chains; intercalary bands evident in girdle view. Valves broadly lanceolate with rounded ends that appear subtly protracted only in very large specimens. Length 122-182 µm, width 26-33 µm. A prominent pseudoseptum is present at each end. Axial area broad, expanding in deltoid fashion into the central area. Central area a nearly rectangular fascia, widening slightly near valve margins. Raphe fissures lateral, becoming reverse lateral and strongly hooked near the large central pores. Distal raphe fissures hooked toward the secondary side. Striae radiate throughout, continuing over onto the valve mantles, 11-12 in 10 µm. Striae puncta 12-16 in 10 µm. For measurements, n = 30 valves.
Original Images
Cite This Page:
Bahls, L. (2011). Stauroneis kishinena. In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/species/stauroneis_kishinena
Species: Stauroneis kishinena
Contributor: Loren Bahls
Reviewer: Mark Edlund
Image Credit: Loren Bahls
- Valves broadly lanceolate, width up to 33 µm
- Pseudosepta present
- Proximal raphe ends strongly curved
- Striae 11-12 in 10 µm
- Apices not protracted
Stauroneis kishinena has large, broadly lanceolate valves without protracted apices. Pseudosepta are present. Proximal raphe ends are strongly curved and expanded. Striae are widely spaced and number 11-12 in 10 µm.
Compare
Stauroneis kishinena differs from S. americana by having strongly curved and expanded proximal raphe ends. Stauroneis finlandia and S. ursamaioris have protracted ends and more closely spaced striae. Stauroneis javanica, a fossil species from the Southern Hemisphere, has somewhat narrower valves (< 30 µm wide) and proximal raphe ends that are less strongly curved and expanded.
Stauroneis americana
Stauroneis finlandia
Stauroneis javanica
(Grunow) Cleve
Stauroneis ursamaioris
Lange-Bertalot and Van de Vijver
Citations
Bahls, L. (2010). Stauroneis in the Northern Rockies: 50 species of Stauroneis sensu stricto from western Montana, northern Idaho, northeastern Washington and southwestern Alberta, including 16 species described as new. Northwest Diatoms, Volume 4. The Montana Diatom Collection, Helena, 172 pp.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID:
Autecology Discussion
Stauroneis kishinena is known only from the type locality, Starvation Ridge Pond in Glacier National Park, which it shares with S. americana and S. finlandia. Water quality measurements were not taken at this site.
Images
Starvation Ridge Pond, Glacier National Park, Montana: type locality of Stauroneis kishinena.
Credit/Source: Billy Schweiger, National Park Service