Neidium iridis (Ehrenberg) Cleve 1894
Publication Details
Neidium iridis (Ehrenberg) Cleve 1894: 69
Published in: Cleve, P.T. (1894). Synopsis of the naviculoid diatoms. Part I. Kongliga Svenska Vetenskapsakademiens Handlingar Series 4 26(2): 1-194, 5 pls.
Request PDFType Species
The type species (holotype) of the genus Neidium is Neidium affine (Ehrenberg) Pfitzer.
Status of Name
This name is of an entity that is currently accepted taxonomically.
Basionym
Navicula iridis Ehrenberg
Type Information
Type locality: "West-Point" [West Point, New York, USA]; (Ehrenberg 1843: 418) Lectotype [designated by Hamilton & al. 2019: 395]: Prof. [J.W.] Bailey; 2 April 1846; BHUPM; Ehrenberg collection, Mica: 260109d (Hamilton & al. 2019: 395)
Origin of Species Name
Noun (Latin), rainbow (Brown 1946).
General Environment
This is a freshwater species.
Description
"Frustule 26 µm in depth. Valves linear to linear elliptic with narrowing obtuse to sagittate apices. Length 198–320 µm long, 26–41 µm wide, 12–15 striae in 10 µm and 12–15 areolae in 10 µm. Areolae opening into longitudinal canal scattered, small and large (fig. 6C). A single row of ghost areolae or open areolae with radiating cribra present along axial area (fig. 6D–F). Cingulum composed of at least four open copulae with two rows of small pores. Copula even in width around the frustule." (emend. P.B.Ham. &
Stachura-Suchoples in Hamilton & al. (2019: 396)
Key Characteristics
This species "... is distinguished from the type species for the genus (Neidium affine (Ehrenb.) Pfitzer) by the number and formation of the longitudinal canals (one large canal versus 2–3 smaller canals), the extremely large size, and the sagittate to cuneate apices versus rostrate to subrostrate apices in Neidium affine. In LM examination the large size (comparable to large Pinnulara taxa) is the most striking feature for Neidium iridis" (Hamilton & al. 2019: 396).
Created: 11 April 2002 by M.D. Guiry.
Last updated: 13 February 2025
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Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=31932
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 13 February 2025. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 14 March 2025
