Navicula cryptocephala
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Category
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Length Range21-34 µm
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Width Range5.2-6.5 µm
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Striae in 10 µm15-17
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ContributorMarina Potapova - Feb 2011
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ReviewerSarah Spaulding - Nov 2011
Identification
Description
Valves are lanceolate with protracted apices The axial area is narrow and straight. The central area is large and circular. The raphe is straight, with 'drop-like' expanded external proximal ends. Striae are radiate around the center, becoming convergent at the apices. The areolae are sometimes visible under LM, and number approximately 35 in 10 μm.
Autecology
This taxon is broadly distributed in rivers and lakes of the US. It is common in waters of moderate to high pH, in higher nutrient waters, and in sites with higher sedimentation.
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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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Occurrence
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BCG
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Waterbody
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Distribution
- Learn more about this
Original Description
N. minuta, laevissima, anguste lanceolata acuminate, apicibus globuloso-capitatis. Long. 1/75’’’-1/85’’’.
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AuthorKütz. 1844
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Length Range26.5-30 µm
Original Images
Citations & Links
Citations
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Publication Link: 10.1080/0269249X.1995.9705330
Links
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Index Nominum Algarum
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GenBank
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North American Diatom Ecological DatabaseNADED ID: 46014
Cite This Page
Potapova, M. (2011). Navicula cryptocephala. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/45918/navicula_cryptocephala
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Navicula cryptocephala 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.
Navicula cryptocephala
- Valves lanceolate with protracted apices
- Central area large, circular
- External proximal raphe ends expanded
Valves are lanceolate with protracted apices The central area is large and circular. The raphe is straight, with 'drop-like' expanded external proximal ends. Striae are radiate around the center, becoming convergent at the apices. The areolae are sometimes visible under LM, approximately 35 in 10 μm.