Luticola cohnii (Hilse) D.G.Mann 1990
Publication Details
Luticola cohnii (Hilse) D.G.Mann 1990: 670
Published in: Round, F.E., Crawford, R.M. & Mann, D.G. (1990). The diatoms. Biology and morphology of the genera. pp. [i-ix], 1-747. Cambridge: Cambridge University Press.
Type Species
The type species (holotype) of the genus Luticola is Luticola mutica (Kützing) D.G.Mann.
Status of Name
This name is of an entity that is currently accepted taxonomically.
Basionym
Stauroneis cohnii Hilse
Type Information
Type locality: Poland: near Strzelin; (INA 1996) Type: Hilse; iii.1860; (INA 1996)
General Environment
This is a freshwater species.
Description
Smaller valves broadly elliptical to linear-elliptical in larger valves, with convex margins and broadly rounded, non-protracted valve ends. Valve length 12-–20 µm, breadth 7.0–-7.5 µm. Axial area narrow, linear, slightly widening towards the central area The central area forms a rectangular to weakly wedge-shaped stauros bordered by one row of small, rounded areolae. One circular stigma is present, usually isolated but sometimes at the end of a short series of areolae. Raphe branches weakly curved with deflected central raphe endings and elongated terminal fissures, continuing onto the valve mantle. Transapical striae radiate in the middle to strongly radiate towards the apices, 20-–22 in 10 µm, composed of two to five small, rounded areolae. Areolae slightly transapically elongated near the valve margins.
Similar Species
Apart from a significantly higher number of striae in 10 µm (15-–20 vs 20–-22), based on the observed features, these valves clearly belong to Luticola cohnii. The species is often misidentified as Luticola mutica, which explains probably the much higher number of records of the latter in the (sub-)Antarctic region (Kellogg & Kellogg 2002). Both species can be separated by differences in the raphe structure (Lange-Bertalot & Bonik 1978). Luticola mutica has typical hooked and quite elongated central endings; whereas, L. cohnii only has short deflected ones. Other taxa such as Luticola muticoides (Hustedt) Mann differ sufficiently to avoid confusion.
Created: 11 April 2002 by M.D. Guiry.
Last updated: 18 May 2023
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Citing AlgaeBase
Cite this record as:
G.M. Guiry in Guiry, M.D. & Guiry, G.M. 18 May 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 04 December 2024
