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Petrodictyon gemma (Ehrenberg) D.G.Mann 1990

Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Bacillariophyceae
Subclass Bacillariophycidae
Order Surirellales
Family Surirellaceae
Genus Petrodictyon


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Petrodictyon gemma (Ehrenberg) D.G.Mann
Close-up _Location: UK. 11 May 2014. Robert Lavigne. © Robert Lavigne (MicroscopyView.com).

Petrodictyon gemma (Ehrenberg) D.G.Mann
Power 600x Dim. 44 x 97 µm _Location: UK. 11 May 2014. Robert Lavigne. © Robert Lavigne (MicroscopyView.com).

Petrodictyon gemma (Ehrenberg) D.G.Mann
Essex UK. 17 Sep 2013. Wulf Herwig. © Wulf Herwig (WEHerwig@arcor.de).


Microcystis zanardinii (Hauck) P.Silva

Petrodictyon gemma (Ehrenberg) D.G.Mann Close-up _Location: UK
© Robert Lavigne (MicroscopyView.com)

Publication details
Petrodictyon gemma (Ehrenberg) D.G.Mann in Round, R.M.Crawford & D.G.Mann 1990: 638, 674

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
This is the type species (holotype) of the genus Petrodictyon.

Status of name
This name is of an entity that is currently accepted taxonomically.

Navicula gemma Ehrenberg

Type information
Lectotype locality: "An der Elbmündung bei Cuxhaven in der Nordsee" [North Sea, Germany] (Jahn & Kusber 2004: 585). Notes: Lectotype (designated by Jahn & Kusber 2004; 585): "Specimen of Taxonomic preparations No. 540032-3 in BHUPM (Fig. 41). The lectotype specimen corresponds to the valve on the left hand side of drawing sheet No. 1147 in BHUPM, except for the bacteria, which Ehrenberg might have interpreted as cilia (Fig. 40)."

Origin of species name
Noun (Latin), bud, eye (of a plant), jewel, precious stone (Brown 1946).

Homotypic Synonym(s)
Navicula gemma Ehrenberg 1840
Surirella gemma (Ehrenberg) Kützing 1844

Nomenclatural notes
According to INA, this names is invalid as the basionym cited as Surirella gemma (INA); name was published as Navicula (Surirella) gemma. Jahn & Kusber (2004: 585) comment: "Navicula gemma Ehrenb. was classified originally within Surirella, an unranked infrageneric name within Navicula. Petrodictyon gemma was based on Navicula gemma sub "Surirella gemma Ehrenb. 1839. Abh. Akad. Wiss. Berlin 1839: 156". Although cited wrongly by Mann (in Round & al. 1990), the basionym is indicated by citing the protologue." - (9 Nov 2016) - Wendy Guiry

General environment
This is a marine species.

Detailed distribution with sources (Click to Load)

Key references
Jahn, R. & Kusber, W.H. (2004). Algae of the Ehrenberg collection - 1. Typification of 32 names of diatom taxa described by C.G. Ehrenberg. Willdenowia 34(2): 577-595, 1 table.

John, J. (2020). Diatoms from arid Australia: taxonomy and biogeography. The diatom flora of Australia Volume 3. pp. [1]-578, 341 figs. Schmitten – Oberreifenberg: Koeltz Botanical Books.

Plinski, M. & Witkowski, A. (2020). Diatoms from the Gulf of Gdansk and surrounding waters (the southern Baltic Sea). pp. [1]-442, incl. 31 SEM pls, 16 photo pls. Gdansk: Gdansk University Press.

Sims, P.A. (ed.) (1996). An atlas of British diatoms arranged by B. Hartley based on illustrations by H.G. Barber and J.R. Carter. pp. [2], 1-601, incl. 290 pls. Bristol: Biopress Ltd.

Witkowski, A., Lange-Bertalot, H. & Metzeltin, D. (2000). Diatom flora of marine coasts I. Iconographia Diatomologica 7: 1-925, 219 pls with 4504 figs.

Created: 23 April 2002 by M.D. Guiry

Verified by: 30 October 2020 by M.D. Guiry

Accesses: This record has been accessed by users 1580 times since it was created.

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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 22 October 2021.

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