• Category
  • Length Range
    2-45 µm
  • Width Range
    2-8 µm
  • Striae in 10 µm
    6 (pores)



Valves are linear with broad, rounded ends. The smallest valves are nearly circular. The sternum is broad and a single row of simple marginal pores is present. The pores are rimmed channels. In girdle view, frustules are rectangular. Frustules are joined together, forming filamentous chains. The valve face surfaces within a filament are alternately convex and concave and fit together convex surface to concave surface. Convex valves have pores that extend through the valve wall in a pervalvar direction. Concave valve pores extend in a transapical direction. The channels formed by these pores in the thick cell walls are notable in light microscopy and their orientation varies depending on a concave or convex valve surface. In girdle view, the mantle is extended at the apices to form prows. Within a frustule, the prows of the epivalve overlap the prows of the hypovalve (SEM). Cingula are incomplete and consist of segments that extend on one side of each valve between the prows. Only the epicingulum is visible in intact frustules. In prepared slides, many epicingula are lost. Post-auxospore valves are expanded centrally. Some valves have thick walls and broadened outlines; these valves are presumed to be resting cells.


Known only from the type location (Haena Wet Cave on the N shore of Kaua’i beside the road to Kee Beach). Reported from wet walls of other nearshore caves in Hawai’I (Rex Lowe).

Original Description

Frustules in girdle view rectangular, forming chains. Valves linear with round ends, 2-45 µm long, 2-8 µm wide, smallest valves nearly circular. Valves with a prow at each end; prows of epivalve overlap prows and mantle of hypovalve. Sternum broad with a single row of simple pores present near valve to mantle transition, 6 in 10 µm. The pores of concave valves extend through the wall in a transapical direction, while those of convex valves extend more or less in a pervalvar direction. Concave valve of one frustule adherent to a convex valve of adjacent frustule in the filament. Cingula composed of two nearly straight band segments and the prows at each end of the valve that separate them. Band segments with small flaps that form pars interior along advalvar edge. Hypocingulum band elements "hidden" under epicingulum of intact frustule.

  • Author
    Main 2003
  • Length Range
    2-45 µm
  • Width
    2-8 µm
  • Striae in 10µm

Original Images

Eolimna metafarta orig desc

Cite This Page

Main, S. (2011). Diprora haenaensis. In Diatoms of North America. Retrieved July 21, 2018, from https://diatoms.org/species/diprora_haenaensis1


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