Placoneis placentula (Ehrenberg) Mereschkowsky 1903
Publication Details
Placoneis placentula (Ehrenberg) Mereschkowsky 1903: 24
Published in: Mereschkowsky, C. (1903). Über Placoneis, ein neues Diatomeen-Genus. Beihefte zum Botanischen Centralblatt 15(1): 1-30, pl. 1.
Request PDFType Species
The type species (lectotype) of the genus Placoneis is Placoneis gastrum (Ehrenberg) Mereschkowsky.
Status of Name
This name is currently regarded as a synonym of Paraplaconeis placentula (Ehrenberg) Kulikovskiy & Lange-Bertalot.
Source of Synonymy
Kulikovskiy, M.S., Lange-Bertalot, H., Metzeltin, D. & Witkowski, A. (2012). Lake Baikal: Hotspot of endemic diatoms I. Iconographia Diatomologica 23: 1-607, incl. 156 pls.
Basionym
Pinnularia placentula Ehrenberg
Type Information
Type locality: "Vera Cruz" [Mexico]; (Ehrenberg 1843: 443) Lectotype [Epitype for lectotype: BM 93093 (Lilliesleaf Pond, "England")]: seaweeds and sediments from the coast of the ocean; BHUPM; fig. 19 on Ehrenberg's drawing sheet No. 2062 (Jahn 2004: 232, fig. 1) Notes: "Cox (2003) designated a neotype for Placoneis placentula (Ehrenberg) Mereschkowski because no Ehrenberg specimen could be found. The original drawing by Ehrenberg is, however, available and was therefore chosen as lectotype by Jahn (2004) with Cox’s neotype rededicated as epitype." (Jahn & Kusber 2009: 103). However, "Lilliesleaf" appears to be in Melrose, Scotland, not England. Ehrenberg (1843: 443) specified "Von den 120 vorn verzeichneten und von mir in Zeichnung vorgelegten Arten von mexikanischen Seethierchen haben hier nur 50 eine Stelle finden können." Thus the lectotype is from a marine habitat in Verz Cruz; it seems strange therefore to have an epitype for this name from a freshwater habitat in Scotland.
General Environment
This is a freshwater species.
Created: 11 April 2002 by M.D. Guiry.
Last updated: 19 March 2025
Verification of Data
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Nomenclatural note
Combination apparently also introduced by Heinzerling (1908, not seen). - (19 May 2016) - M.D. Guiry
Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=34260
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 19 March 2025. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 17 July 2025
