Luticola stigma

(R.M.Patrick) J.R.Johansen 2004      Category: Symmetrical biraphid
BASIONYM: Navicula mutica var. stigma R.M.Patrick 1959

Luticola mobiliensis


Mastogloia albertii

LM scalebar = 10 µm = 80 pixels.


Contributor: Ian Bishop - December 2015
Length Range: 23-39 µm
Width Range: 6.9-9.2 µm
Striae in 10 µm: 19-22


Valves are lanceolate with broadly rounded, protracted apices. The central area is transverse with marginal areolae and a single, distinct stigma positioned near the valve margin. Striae are radiate and increasingly so toward the apices. Areolae are coarse and easily visible in LM, measuring 16-18 in 10 µm at mid-valve, increasing to 20 µm at the apices. The axial area is narrow and linear, expanding slightly toward the central area. The raphe is filiform, with both proximal raphe ends deflected unilaterally, away from the isolated stigma.

Original Description

Basionym: Navicula mutica var. stigma
Author: R.M.Patrick 1959
Length Range: 21-36 µm
Width Range: 7-11 µm
Striae in 10 µm: 16-19 at center; up to 24 at ends of valve

Original Description

Valve broadly lanceolate with broadly rostrate ends, and axial area narrow, central area transverse. On one side of the central nodule a distinct stigma. Striae radiate throughout the valve. Strie, 16-19 in 10 µ at center of valve to 24 in 10 µ at ends of valve. Length, 21-36 µ (type, 36 µ). Breadth, 7-11 µ (type, 11 µ).

Original Images

Cite This Page:
Bishop, I. (2015). Luticola stigma. In Diatoms of the United States. Retrieved April 25, 2018, from

Species: Luticola stigma

Contributor: Ian Bishop

Reviewer: Marina Potapova


Johansen, J.R., Lowe, R., Gomez, S.R., Kociolek, J.P. and Makosky, S.A. (2004). New algal species records for the Great Smoky Mountains National Park, U.S.A., with an annotated checklist of all reported algal species for the park. Archiv für Hydrobiologie Supplement 150: 17-44.

Levkov, Z., Metzeltin, D. and Pavlov, A. (2013). Luticola and Luticopsis. In: Diatoms of Europe, Diatoms of the European Inland Waters and Comparable Habitats, Volume 7, Koeltz Scientific Books, pp. 698.

Patrick, R.M. (1959). New species and nomenclatural changes in the genus Navicula (Bacillariophyceae). Proceedings of the Academy of Natural Sciences of Philadelphia 111 (1959): 91-108 .

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.

Potapova, M. (2013). The types of 22 Navicula (Bacillariophyta) species described by Ruth Patrick. Proceedings of the Academy of Natural Sciences of Philadelphia 162: 1-23.

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)

Transfer INA
Original INA

California Academy of Sciences (CAS)

Luticola stigma CAS

North American Diatom Ecological Database (NADED)

NADED ID: 130019

Autecology Discussion