Psammothidium daonense | Species - Diatoms of North America

Category

Monoraphid
Length Range

9-23 µm
Width Range

4.8-7.5 µm
Striae in 10 µm

24-30

Synonyms

Psammothidium grischunum f. daonensis (Lange-Bert.) Bukht. and Round

Contributor

Marina Potapova - Aug 2010
Reviewer

Sarah Spaulding - Aug 2013

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Identification

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Description

Valves are elliptical to linear-elliptical. The raphe valve has a linear axial area, which widens into a transapically elliptical, rectangular, or diamond-shaped central area. The raphe is straight, without terminal fissures. The central and terminal raphe ends are slightly expanded externally. The central raphe ends curve toward opposite sides internally. The rapheless valve has a large rhomboid axial area, which has an irregular border. The central area is usually not differentiated from the axial area. Striae are radiate on both valves, 24-30 in 10 µm, interrupted at the valve margin. One row of areolae is present on the mantle of both valves; occasionally a second row of areolae is inserted on the valve margin. Areolae are 36-48 in 10 µm within the striae. The external openings of the areolae are mostly circular, occasionally elongated.

Autecology

Size Range, µm3

101-1000
Motility

Slightly motile
Attachment

Prostrate
Habitat

Benthic
Colony

Solitary
Occurrence

Rare
BCG

BCG 2
Waterbody

Inland Rivers
Distribution

Western rivers 2004 California coastal rivers 2017 Northeast lake sediments
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Original Description

Valvae ellipticae ad lineari-ellipticae apicibus late rotundatis non protractis, 10-26 μm longae, 5-8 μm latae. Raphovalva: Raphe filiformis recta, poros terminales influens; pori centrales modice approximate. Area axialis anguste linearis area centralis variabiliter transverse dilatata. Areovalva: Area axialis plus minusque late lanceolata influens in aream centralis rhombicam irregulariter marginatum. Striae transapicales modice radiantes in media parte valvarum usque ad apices, 27-32/10 μm. Quamquam similis a A. marginulata, A. kryophila, A. helvetica satis differt.

Basionym

Achnanthes daonensis
Author

Lange-Bert. 1989
Length Range

10-26 µm
Width

5-8 µm
Striae in 10µm

27-32

Original Images

Citations & Links

Citations

Cite This Page

Potapova, M. (2010). Psammothidium daonense. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/44783/psammothidium_daonense

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Psammothidium daonense 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.