Cosmioneis hawai'iensis
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Category
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Length Range30-42 µm
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Width Range12-15 µm
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Striae in 10 µm17 in the center, 22 at the ends
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ContributorRex Lowe - Dec 2011
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ReviewerSarah Spaulding - Aug 2013
Identification
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.
Autecology
Populations of C. hawai'iensis are primarily from subaerial habitats Hawai’i.
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Size Range, µm3
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Motility
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Attachment
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Habitat
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Colony
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Waterbody
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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.
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AuthorR.L.Lowe and A.R.Sherwood 2010
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Length Range30-42 µm
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Width12-15 µm
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Striae in 10µm17 in the center, 22 at the ends
Citations & Links
Cite This Page
Lowe, R. (2011). Cosmioneis hawai'iensis. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/47871/cosmioneis_hawaiiensis
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Cosmioneis hawai'iensis from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:
ELEVATION = stream reach elevation (meters)
STRAHLER = distribution plot of the Strahler Stream Order
SLOPE = stream reach gradient (degrees)
W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.
PHSTVL = pH measured in a sealed syringe sample (pH units)
log_COND = log concentration of specific conductivity (µS/cm)
log_PTL = log concentration of total phosphorus (µg/L)
log_NO3 = log concentration of nitrate (µeq/L)
log_DOC = log concentration of dissolved organic carbon (mg/L)
log_SIO2 = log concentration of silicon (mg/L)
log_NA = log concentration of sodium (µeq/L)
log_HCO3 = log concentration of the bicarbonate ion (µeq/L)
EMBED = percent of the stream substrate that is embedded by sand and fine sediment
log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).
DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.
Cosmioneis hawai'iensis
- 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.