Humidophila perpusilla | Species - Diatoms of North America

Category

Symmetric Biraphid
Length Range

9.7-17.7 µm
Width Range

3.7-4.7 µm
Striae in 10 µm

32-36

Synonyms

Schizonema perpusillum (Grunow) Kuntze
Navicula gallica var. perpusilla (Grunow) Lange-Bert.
Diadesmis perpusilla D.G.Mann

Contributor

Meredith Tyree Polaskey - May 2018
Reviewer

Ionel Ciugulea - Sep 2018

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Identification

Humidophila Perpusilla Nh10063 A 121117 26 C

Humidophila Perpusilla Nyhp001 A 121417 15 C

Humidophila Perpusilla Nh10063 A 121117 60 C

Humidophila Perpusilla Vt10094 A 111017 48 C

Humidophila Perpusilla Me10009 B 101317 137 C

Humidophila Perpusilla Me10043 A 110117 48 C

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Description

Valves are elliptic-lanceolate to linear-lanceolate with a slight central inflation. Ends are slightly rostrate in large to mid-size individuals and broadly rounded in small individuals. The axial area is wide and lanceolate, expanding into an elliptic central area. The striae are radiate throughout. The raphe is filiform with unexpanded proximal ends.

Autecology

Humidophila perpusilla favors aerial and low-light habitats, such as intermittently wettened rocks, soils, and caves. Humidophila perpusilla is widespread throughout North America, Asia, and Europe, but typically not in high abundance. This taxon frequently co-occurs with H. contenta (Lange-Bertalot et al. 2017).

Cells may be joined, valve face to valve face, in short filaments.

Size Range, µm3

11-100
Motility

Slightly motile
Attachment

Unattached
Habitat

Soils Moist habitats Benthic
Colony

Colonies occasional
Occurrence

Rare
Waterbody

Inland Rivers Lakes
Distribution

Western rivers 2004 Southeast rivers 2014 Northeast lake sediments
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Original Description

Navicula perpusilla m. (Synedra perpusilla K g.?)

Navicula minuta a latere secundario lineari oblonga obtuse medio leviter tumida, nodulo centrali parvo, striis transversalibus subtillimis sub-parallelis plerumque vix conspicuis ultra 60 in 0.001’’. Longit. 0.00023-0.0007’’, latid. 0.0001-0.0002’’.

Habitat inter algas in vitreis diu asservatas. Tab. Nostr. II, Fig. 7 a, b, c, d, e, f, 400/1, g 800/1 aucta.

Basionym

Navicula perpusilla
Author

Grunow 1860
Length Range

5.8-17.8 µm
Width

2.5-5.1 µm
Striae in 10µm

24

Original Images

Citations & Links

Citations

Cite This Page

Polaskey, M. (2018). Humidophila perpusilla. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/62114/humidophila-perpusilla

Responses

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