Cosmioneis hawai'iensis
Lowe and Sherwood 2010 Category: Symmetrical biraphid
BASIONYM: Cosmioneis hawai'iensis Lowe and Sherwood 2010
Observations
Contributor: Rex Lowe - December 2011
Length Range: 30-42 µm
Width Range: 12-15 µm
Striae in 10 µm: 17 in the center, 22 at the ends
Description
Valves are distinctly capitate with broadly rounded margins. The axial area is narrow, expanding to rounded central area. Proximal raphe ends are slightly expanded on external surface of the valve. Distal raphe ends are curved in the same direction. Striae are punctate, radiate and curve from the margin toward the center of the valve. Striae number 17 in 10 μm in the center, becoming finer at the ends (22 in 10 μm). Areolae number 16 in 10 μm and are round toward valve ends and transversely elongate near the center valve.
Original Description
Basionym: Cosmioneis hawai'iensis
Author: Lowe and Sherwood 2010
Length Range: 30-42 µm
Width Range: 12-15 µm
Striae in 10 µm: 17 in the center, 22 at the ends
Original Description
Valves are distinctly capitate with broadly rounded margins (Figs. 19-24). Valves 30-42 μm long, 12-15 μm wide. Axial area narrow expanding to rounded central area. Proximal raphe ends slightly expanded on the valve surface in pyriform depression (Fig. 17), Distal raphe ends are curved in the same direction (Fig. 23). Internally, raphe ends are anchor-shaped (Fig. 24). Striae punctate, and radiate, curving from the margin toward the center of the valve. Striae 17 in 10 μm in the center becoming finer at the ends (22/10 μm). Puncta 16/10 μm round toward valve ends, transversely elongated near center.
Original Images
Cite This Page:
Lowe, R. (2011). Cosmioneis hawai'iensis. In Diatoms of the United States. Retrieved June 18, 2013, from http://westerndiatoms.colorado.edu/taxa/species/cosmioneis_hawaiiensis
Species: Cosmioneis hawai'iensis
Contributor: Rex Lowe
Image Credit: Rex Lowe
- Valve margins broadly rounded
- Apices capitate
Cosmioneis hawai’iensis has broadly rounded valve margins and distinctly capitate apices. The proximal raphe ends are slightly expanded and the distal raphe ends are curved in the same direction. The striae are punctate, radiate and curve toward the center of the valve.
Compare
Cosmioneis hawai’iensis is more broadly rounded and more strongly capitate than C. lundstroemii. Cosmioneis hawai’iensis should also be Cosmioneis capitata which is strongly capitate but narrower and less rounded than C. hawai’iensis. In addition, C. capitata is 11 μm in width, while C. hawai’iensis is 12-15 μm in width.
Cosmioneis capitata
(Hustedt) Lange-Bertalot
Cosmioneis lundstroemii
(Cleve) Round, Crawford and Mann
Citations
Lowe, R.L. and Sherwood, A.R. (2010). Three new species of Cosmioneis (Bacillariophyceae) from Hawai'i. Proceedings of the Academy of Natural Sciences of Philadelphia 160(1):21-28. 10.1635/053.160.0104
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID:
Autecology Discussion
Populations of C. hawai'iensis are primarily from subaerial habitats Hawai’i.