• Category
  • Length Range
    109-158 µm
  • Width Range
    13.9-18.6 µm
  • Striae in 10 µm
  • Synonyms
    Navicula clericii Freng.
  • Reported As
    Pinnularia hyalina (Metzeltin and Lange-Bertalot 1998, Pl. 187, figs 7-9)



Valves are linear, with a gibbous center and cuneate-subcapitate apices. The axial area is broad, linear, gradually widening into a large central area that is expanded to valve margins forming a rhombic fascia. The central area has four large, shallow depressions. The raphe is lateral with proximal raphe ends weakly expanded, deflected to primary side. The terminal raphe fissures are sickle-shaped. Striae are short throughout most of the valve, radiate at the valve center and convergent at the apices.

This taxon has been confused with Pinnularia hyalina (Metzeltin and Lange-Bertalot 1998).


The images shown here are from lakes in New Jersey - Oscaleta Lake, Stony Lake, and Bells Lake. The species was originally described from Argentina (Frenguelli 1923).

Original Description

13. Navicula (Pinnularia) Clericii n. sp. (pl. III, fig. 6)

Valva alargada, delgada, linear, con extremos algo dilatados con terminación subcuneiforme y parte mediana ampliamente ensanchada; rafe filiforme, levemente ondulado, con fisuras terminales ligeramente curvas enforma de coma y estigmas mediales distanciados eutre sí; nódulos central y terminales grandes, ovoidales, excentricos; area al rededor de un tercio delancho de la valva, ensanchandose a medida que la valva se dilata y formando un amplio espacio estauroneiforme al nivel del nódulo mediano; estrías 7 en 0,01, fuertemente radiantes en correspondencia de la diiatación mediana y convergentes en las extremidades, faltando non complete, y amplianmente, sobre los costado del espacio estauroneiforme. Largo, 0,190 a 0,195 mm.; ancho al nivel de la parte media, 0,024; y sólo 0,016 en las porciones comprendidas entre las gibosidades.

Próxima a N. gibba var. exilis de los tipos de Moeller y a N. tabellaria Ehr., particularmente a su variedad stauroneiforms H.V.H., de la cual se aparta por las proporciones de la dilatación mediana, por la forma del pseudo-estauro y de las terminaciones mediales del rafe, por el número de las estrías, por el tainano, etc.

  • Basionym
    Navicula clericii
  • Author
    Freng. 1923
  • Length Range
    190-195 µm
  • Width
    24 µm
  • Striae in 10µm

Original Images

Navicula clericii orig ill
Navicula clericii orig descr

Cite This Page

Kersey, M., Potapova, M. (2022). Pinnularia clericii. In Diatoms of North America. Retrieved June 21, 2024, from https://diatoms.org/species/pinnularia-clericii


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