Visit us at

Diatoms of the United States is now known as Diatoms of North America.
This site has been redesigned and updated, and will be closing soon.

Navicula ingenua

Hust. 1957      Category: Symmetrical biraphid

Navicula hodgeana


Navicula kotschyi

LM scalebar = 10 µm = 80 pixels.


Contributor: Meredith Tyree | Ian Bishop - March 2016
Length Range: 7-9 µm
Width Range: 3.0-4.0 µm
Striae in 10 µm: 20-22


Valves are small. Valves are elliptical-lanceolate with cuneate apices. The axial area is narrow. The central area forms a distinct, asymmetric fascia, broadly expanded near the margin on one side and narrow on the other. The fascia may contain shortened, marginal striae. The raphe is linear, with relatively widely separated and inflated proximal ends. The striae are radiate throughout. Areolae are coarse, punctate and visible in LM.

Note that Navicula ingenua lacks the features of the genus Navicula sensu stricto, and is due for inclusion in another (to be described?) genus.

Original Description

Author: Hust. 1957
Length Range: 7-5 µm
Width Range: 3-5 µm
Striae in 10 µm: 24

Original Description

  1. Navicula ingenua nov. spec. Schalen rhombisch-elliptisch mit stumpf gerundeten Enden, um 7,5 μ lang, etwa 3,5 μ breit. Rhaphe gerade, mit entfernt gestellten Zentralporen, Axialarea sehr eng, Zentralarea eine weite, aber unsymmetrische, bis an den Rand reichende Querbinde. Struktur grob, Transapikalstreifen stark radial, etwa 24 in 10 μ, sehr deutlich punktiert. Abb. 19,20.

Valvae rhomico-ellipticae apicibus obtuse rotundatis, circiter 7,5 μ longae et 3,5 latae. Rhaphe directa poris centralibus distantibus, area axialis angustissima, area centralis lata, asymmetrica, usque ad marginem dilatata. Structura valida, striae transapicales randiantes circiter 24 in 10 μ, grosse punctatae.

Nur im Maschinenfleet, sehr selten im Gundschlamm vor dem Gröpelinger Fleet, aber an diesem Fundort vielleicht kaum autochthon. Ökologisch nach diesem Einzelfund nicht zu charakterisieren.

Original Images

Cite This Page:
Tyree, M., and Bishop, I. (2016). Navicula ingenua. In Diatoms of the United States. Retrieved May 23, 2018, from

Species: Navicula ingenua

Contributor: Meredith Tyree | Ian Bishop

Reviewer: Pat Kociolek


Hustedt, F. (1957). Die Diatomeenflora des Flußsystems der Weser im Gebiet der Hansestadt Bremen. Abhandlungen des Naturwissenschaftlichen Verein zu Bremen 34(3):181-440.

Simonsen, R. (1987). Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer, Berlin & Stuttgart 1: 525 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Navicula ingenua CAS

North American Diatom Ecological Database (NADED)

NADED ID: 46362

Autecology Discussion

Navicula ingenua was verified in piedmont rivers of the southeast US, particularly those that have been impacted by pollutants.


Distribution of Navicula ingenua in rivers of the continental U.S. based on the National Water Quality Assessment program. Retrieved 02 May 2016.

Credit/Source: USGS BioData

EMAP Assessment

The Environmental Protection Agency (EPA) western Environmental Monitoring and Assessment Program (EMAP) study was completed during the years 2000-2004 (see citations at bottom of this page). Over 1200 streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming) were selected for sampling based on a stratified randomized design. This type of design insures that ecological resources are sampled in proportion to their actual geographical presence. Stratified randomized design also allows for estimates of stream length with a known confidence in several “condition classes” (good or least-disturbed, intermediately-disturbed, and poor or most-disturbed) for biotic condition, chemistry and habitat.

EMAP Distribution

Navicula ingenua

EMAP Response Plots

Navicula ingenua

EMAP citations

Results are published in:

Johnson, T., Hermann, K., Spaulding, S., Beyea, B., Theel, C., Sada, R., Bollman, W., Bowman, J., Larsen, A., Vining, K., Ostermiller, J., Petersen, D. Hargett, E. and Zumberge, J. (2009). An ecological assessment of USEPA Region 8 streams and rivers. U.S. Environmental Protection Agency Region 8 Report, 178 p.

Stoddard, J. L., Peck, D. V., Olsen, A. R., Larsen, D. P., Van Sickle, J., Hawkins, C. P., Hughes, R. M., Whittier, T. R., Lomnicky, G. A., Herlihy, A. T., Kaufman, P. R., Peterson, S. A., Ringold, P. L., Paulsen, S. G., and Blair, R. (2005). Environmental Monitoring and Assessment Program (EMAP) western streams and rivers statistical summary. U.S. Environmental Protection Agency Report 620/R-05/006, 1,762 p.

Stoddard, J. L., Peck, D. V., Paulsen, S. G., Van Sickle, J., Hawkins, C. P., Herlihy, A. T., Hughes, R. M., Kaufman, P. R., Larsen, D. P., Lomnicky, G. A., Olsen, A. R., Peterson, S. A., Ringold, P. L., and Whittier, T. R. (2005). An ecological assessment of western streams and rivers. U.S. Environmental Protection Agency Report 620/R-05/005, 49 p.