Planothidium apiculatum
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Category
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Length Range25-31 µm
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Width Range9.0-12.7 µm
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Striae in 10 µm10-12
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ContributorMarina Potapova - Dec 2010
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ReviewerRex Lowe - Aug 2011
Identification
View image metadata
Type
Description
Valves are elliptic-lanceolate with apiculate apices. The raphe valve has a large rhomboid or transversely elliptic central area. The rapheless valve has an asymmetric central area, expanded on one side to the valve margin. This asymmetric central area also contains a cavum on the internal valve surface. The raphe is straight with expanded external proximal ends. The striae are strongly radiate on the raphe valve and slightly radiate on the rapheless valve. The striae are multiseriate.
Original Description
Valvae elliptico-lanceolatae, 28 μ longae, 10-11 μ latae, apicibus apiculatis. Valva superior ad instar soleae equinae effigiem in medio ostendens, pseudoraphe anguste lanceolata; striis radiantibus, 10-12 in 10 μ. Valva inferior aream axialem angustam et aream centralem rotundatam exhibens; striis validis radiantibus, 10 in 10 μ.
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BasionymAchnanthes lanceolata var. apiculata
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AuthorR.M.Patrick 1945
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Length Range28 µm
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Width10-11 µm
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Striae in 10µm10-12
Original Images
Citations & Links
Citations
Links
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North American Diatom Ecological DatabaseNADED ID: 155019
Cite This Page
Potapova, M. (2010). Planothidium apiculatum. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/45147/planothidium_apiculatum
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Planothidium apiculatum 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.
Planothidium apiculatum
- Valves elliptic-lanceolate with apiculate apices
- Valves 9.0-12.7 μm wide
- Rapheless valve with a cavum
Valves are elliptic-lanceolate with apiculate apices. The raphe valve has a large rhomboid or transversely elliptic central area. The rapheless valve has an asymmetric central area, expanded at one side to the valve margin, containing a prominent cavum. The striae are strongly radiate on the raphe valve and slightly radiate on the...