Lacustriella lacustris

(W.Greg.) Lange-Bert. and Kulikovskiy 2012      Category: Symmetrical biraphid
BASIONYM: Navicula lacustris W.Greg. 1856
SYNONYM(S): Cavinula lacustris (W.Greg.) D.G.Mann and Stickle 

Kurtkrammeria weilandii


Lemnicola hungarica

LM scalebar = 10 µm = 40 pixels.


Contributor: Mark Edlund | David R.L. Burge - June 2017
Length Range: 36-47 µm
Width Range: 16-18 µm
Striae in 10 µm: 14-15 at the valve center, 15-16 at the apices


Valves lanceolate to linear-lanceolate. Apices small and protracted, ending bluntly rounded. The axial area is linear-lanceolate. The raphe is lateral with inflated proximal ends and the distal raphe ends deflect opposite each other continue on to the mantle. The central area is circular to elliptic. Striae parallel at the central area becoming curved radiate. Areolae round with highly variable spacing, occurring 13-21 in 10 µm. Areolae sometimes regularly spaced throughout and in other valves areolae are less densely spaced near the axial area becoming more densely spaced at the near the face mantle junction. The terminal areola on each stria is transapically elongated.

Original Description

Basionym: Navicula lacustris
Author: W.Greg. 1856
Length Range: µm
Striae in 10 µm:

Original Description

Navicula lacustris, W. G.—This fine species has only as yet occurred in the gathering from Lochleven, in which, though not abundant, it is yet far from scarce. It presents two well-marked varieties, a and ß, which pass into each other by intermediate forms: a, which is rather more abundant than the other, is elliptico-lanceolate, with acute apices. Nodule bright in the centre, but without definite outline. Median line double. Striae fine, but distinct, slightly inclined ; about 28 or 30 in. .001 ; length from .0016 to .0025 inch : ß agrees in every point with a, except in outline. It is broad, has straight sides, sometimes even a little incurvated, and suddenly contracted to narrow produced extremities. These two varieties are seen in fig’s. 23 and 23 ß, and there exists an intermediate form. The only species with which this could in any way be confounded is N. firma var. ß. But the latter is longer and larger, always of a brown colour, and in N. firma not only are the striae much finer and less con-spicuous, but they are almost exactly parallel. It is not easy in a drawing to give certain peculiarities of aspect, but anyone who compares the two species, N. firma ß and N. lacustris, will perceive that the latter has an aspect entirely different from the former. Moreover the side lines, always seen in N. firma, never occur in N. lacustris.

Original Images

Cite This Page:
Edlund, M., and Burge, D. (2017). Lacustriella lacustris. In Diatoms of the United States. Retrieved March 23, 2018, from

Species: Lacustriella lacustris

Contributor: Mark Edlund | David R.L. Burge

Reviewer: Rosalina Stancheva


Camburn, K.E., Lowe, R.L., and Stoneburner, D.L. (1978). The haptobenthic diatom flora of Long Branch Creek, South Carolina. Nova Hedwigia 30: 149-279.

Foged, N. (1981). Diatoms in Alaska. Bibliotheca Phycologica, Band 53, J. Cramer, Vaduz, 317 pp.

Gregory, W. (1856). Notice of some new species of British Fresh-water Diatomaceae. Quarterly Journal of Microscopical Science, new series, London 4:1-14, pl. I.

Kulikovskiy, M.S., Lange–Bertalot, H., Metzeltin, D. and Witkowski, A. (2012). Lake Baikal: Hotspot of endemic diatoms I. Iconographia Diatomologica, Vol. 23 (Lange–Bertalot, H., ed.) Koeltz Scientific Books. Koenigstein , pp. 7–607.

Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.

Round, F.E., Crawford, R.M. and Mann, D.G. (1990). The Diatoms. Biology and Morphology of the Genera. Cambridge University Press, Cambridge, 747 pp.

Stoermer, E.F. (1980). Characteristics of benthic algal communities in the upper Great Lakes. U.S. Environmental Protection Agency, Ecological Research Series, EPA 600/3-80-073. Environmental Research Laboratory, Duluth, Minnesota. 72 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA
Original INA

California Academy of Sciences (CAS)

Lacustriella lacustris CAS

North American Diatom Ecological Database (NADED)

NADED ID: 195007

Autecology Discussion

While this taxon was named for first being found in a lacustrine environment, it is also found in lotic environments of eastern and north central United States (Patrick and Reimer 1966), growing epilithic and epiphytic in stream habitats (Camburn et al. 1978). This taxon is common and prefers circumneutral water chemistry in Alaska (Foged 1981). Stoermer (1980) reported this taxon rare in shallow habitats of Lake Michigan, Lake Huron, and Lake Superior. Bahls (2017) reports it from a river in Nunavut, Canada.

Cavinula lacustris is distributed globally in lakes from Mongolia (Kulikovskiy et al. 2012) to the United Kingdom (Smith 1856).


The distribution of Cavinula lacustris in streams of the United States. Accessed on July 5, 2017.

Credit/Source: USGS Biodata