Geissleria lateropunctata
(Wallace) Potapova and Winter 2006 Category: Symmetrical biraphid
BASIONYM: Navicula lateropunctata Wallace 1960
REPORTED AS: Geissleria neotropica (Metzeltin and Lange-Bertalot 1998 )
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - December 2010
Length Range: 15-25 µm
Width Range: 7-9 µm
Striae in 10 µm: 18-22
Description
Valves are elliptical-lanceolate, often slightly dorsiventral, with narrowly rostrate or subrostrate ends, 7.0-9.0 µm wide and 15-25 µm long. The raphe is straight and filiform. The axial area is narrow and linear. The central area is small, with one to five isolated areolae. Striae are uniseriate, radiate, 18-22 in 10 µm. Areolae are apically elongated, 65-70 in 10 µm. Subpolar areolae, or annulae, are larger than areolae on other parts of the valve. The annulae form three-four rows at each pole.
Original Description
Basionym: Navicula lateropunctata
Author: Wallace 1960
Length Range: 17-22 µm
Width Range: 8 µm
Striae in 10 µm: 22-24
Original Description
Valve late ellipticus, 17-22 µ longis, 8 µ latis, subpole valde constrictus, apicibus subcapitatus, striis subradiantibus, 22-24 in 10 µ, punctum solitarium unilateral prope nodulum cebtrales manifestum.
Original Images
Original text and images reproduced with permission by Academy of Natural Sciences of Philadelphia.
Cite This Page:
Potapova, M. (2010). Geissleria lateropunctata. In Diatoms of the United States. Retrieved May 24, 2013, from http://westerndiatoms.colorado.edu/taxa/species/geissleria_lateropunctata
Species: Geissleria lateropunctata
Contributor: Marina Potapova
Image Credit: Marina Potapova
- Valves elliptical-lanceolate with narrowly rostrate or subrostrate apices
- Central area formed by one shortened stria at each side
- One to five isolated areolae in central area
- Annulae in three or four rows at poles
Valves are elliptical-lanceolate, often slightly dorsiventral, with narrowly rostrate or subrostrate ends, 7.0-9.0 µm wide and 15-25 µm long. The central area is small, with one to five isolated areolae. Striae are radiate, and number 18-22 in 10 µm. The annulae form three-four rows at each pole.
Compare
Geissleria lateropunctata differs from G. punctifera by elliptical-lanceolate valves with narrowly rostrate or subrostrate apices. Valves of G. punctifera are more narrow, lanceolate, with broadly subrostrate apices. G. lateropunctata has one to five isolated areolae in central area while G. punctifera has one isolated areola. G. kriegeri is smaller and has no isolated areolae in central area.
Geissleria punctifera
Geissleria kriegeri
Citations
Potapova, M. and Winter, D. (2006). Use of nonparametric multiplicative regression for modeling diatom habitat: a case study of three Geissleria species from North America. In: Advances in Phycological Studies (N. Ognjanova-Rumenov and K. Manyolov, eds). Pensoft Publishers, Sofia-Moscow pp. 319-332.
Wallace, J. (1960). New and variable diatoms. Notulae Naturae 331: 1-8.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 210012
Autecology Discussion
Images
A cell of G. lateropuctata
Credit/Source: M. Potapova