Credit: USGS BioData
Distribution of Craticula accomoda in continental U.S. rivers in the National Water Quality Assessment program. Retrieved 03 June 2015.
Craticula accomoda
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Category
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Length Range19.0-20.3 µm
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Width Range4.8-6.4 µm
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Striae in 10 µm20-26
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ContributorIan Bishop, David R.L. Burge - May 2015
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ReviewerKalina Manoylov - May 2015
Identification
Description
Valves are linear-lanceolate, with rostrate to subcapitate, rounded apices. The axial area is narrow and the central area only slightly expanded. Striae are weakly radiate near the valve center, then parallel, becoming convergent near the apices. The raphe is filiform. The distal raphe ends are unidirectionally deflected. Areolae are not visible in LM.
Autecology
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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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BCG
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Waterbody
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Distribution
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Credit: USGS BioData
Distribution of Craticula accomoda in Alaskan rivers in the National Water Quality Assessment program. Retrieved 03 June 2015.
Original Description
Navicula accomoda nov. spec. Schalen elliptisch-lanzettlich mit kurz geschnäbelten Enden, um 22 µ lang, etwa 7,5 µ breit. Raphe gerade, fadenförmig, mit etwas entfernt gestellten Zentralporen und kleinen, kaum unterscheidbaren Polspalten. Axialarea schmal linear, um den Zentralknoten nur sehr wenig erweitert. Transapikalstreifen durchweg senkrecht zur Mittellinie, in der Mitte, etwa 25 in 10 µ, gegen die Enden allmählich enger werdend, bis etwa 32 in 10 µ, sehr zart punktiert. Taf. XXXIX, Fig. 17, 18.
Charemsee, sehr selten.
Die Art hat gewisse Ähnlichkeiten mit Navicula halophila (GRUN.) CLEVE und N. simplex KRASSKE, unterscheidet sich aber von beiden Formen durch die im mittleren Teil der Schalen entfernter stehenden Streifen, von N. simplex auch durch die Richtung besonders der Polstreifen.
Während des Druckes dieser Arbeit wurde die Art von weiteren Standorten bebannt: MAX MÖLLER (Odense) fand sie auf Fünen, MESSIKOMMER stellte sie in der Schweiz fest (massenhaft, fast rein, in einer Probe aus dem Hemmentaler Bach, Kanton Schaffhausen) und mein Schuler stud. ret. nat. MARTIN SCHEELE fand sie in der Fulda. Das Material von den genannten Standorten hat mir zur Nachprüfung vorgelegen.
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BasionymNavicula accomoda
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AuthorHust. 1950
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Length Range22 µm
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Width7.5 µm
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Striae in 10µm25
Original Images
Citations & Links
Citations
Links
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Index Nominum Algarum
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GenBank
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North American Diatom Ecological DatabaseNADED ID: 21003
Cite This Page
Bishop, I., Burge, D. (2015). Craticula accomoda. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/50469/craticula_accomoda
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Craticula accomoda 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.
Craticula accomoda
- Valves small
- Apices rostrate to subcapitate
- Stria density similar across valve
- Striae convergent near apices
Valves linear-lanceolate with rostrate to subcapitate rounded ends. Striae are weakly radiate near the valve center, then parallel, becoming convergent near the apices. The stria density is similar across the valve, and striae are visible at the apices. Areolae are not visible in LM.