• Category
  • Length Range
    12-60 µm
  • Width Range
    10-16 µm
  • Striae in 10 µm
  • Synonyms
    Cystopleura musculus (Kütz.) Kuntze 1891
    Rhopalodia gibberula var. musculus (Kütz.) A.Cleve 1952



Valves of this species are semi-elliptical, strongly convex along the dorsal margin, concave along the ventral margin, tapering to narrowly rounded ends. The raphe is located in the canal along the dorsal margin. There are distinct costae along the valve face that number 3-5 in 10 µm. Striae are in rows of 2-4 between the costae.


Original Description

  • Basionym
    Epithemia musculus
  • Author
    Kütz. 1844

EMAP Assessment

EMAP Distribution

Rhopalodia Musculus   Kùtzing   Mùller 10
Map 10

Response Plots

Rhopalodia Musculus

Citations & Links


  • Index Nominum Algarum
  • CAS
  • North American Diatom Ecological Database
    NADED ID: 58006

Cite This Page

Kociolek, P. (2011). Rhopalodia musculus. In Diatoms of North America. Retrieved July 18, 2019, from https://diatoms.org/species/rhopalodia_musculus


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