Planothidium dubium

(Grunow) Round and Bukhtiyarova 1996      Category: Monoraphid
BASIONYM: Achnanthes lanceolata var. dubia Grunow 1880

Planothidium delicatulum

 

Planothidium frequentissimum

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Marina Potapova - August 2011
Length Range: 7-20 µm
Width Range: 4-8.5 µm
Striae in 10 µm: 13-15

Description

Valves are linear-elliptical with rostrate, subrostrate or narrowly subcapitate apices. The raphe valve has a linear axial area and transversely rectangular central area. The rapheless valve has a narrow, linear axial area. The asymmetric central area on the rapheless valve contains a shallow depression on the internal valve surface. The raphe is straight with expanded external proximal endings. The striae are radiate throughout both valves.



Original Description

Basionym: Achnanthes lanceolata var. dubia
Author: Grunow 1880
Length Range: 15-17 µm
Width Range: 7-7.2 µm
Striae in 10 µm: 13-14

Original Description

A. lanceolata var. dubia GRUN. (Achnanthidium delicatulum KG. ex parte?) Steht der vorigen Art sehr nahe, und unterscheidet sich fast nur durch die kurzen, breit lanzettlichen kurz zugespitzten Schaalen, und den etwas schmäleren Pseudostauros der unteren Schaalen. Querstreifen 13-14 in 0,01 mm. Länge 0,015-0,017 mm., Breite 0,007-0,0072 mm. Buchberg in Unterösterreich, Belgien.

Original Images


Cite This Page:
Potapova, M. (2011). Planothidium dubium. In Diatoms of the United States. Retrieved November 23, 2014, from http://westerndiatoms.colorado.edu/taxa/species/planothidium_dubium

Species: Planothidium dubium

Contributor: Marina Potapova

Reviewer: Sarah Spaulding

Citations

Cleve, P.T. and Grunow, A. (1880). Beiträge zur Kenntniss der Arctischen Diatomeen. Kongliga Svenska-Vetenskaps Akademiens Handlingar, Vol: 17, Issue: 2, 121 pp., 7 pls.

Round, F. E. and Bukhtiyarova, L. (1996). Four new genera based on Achnanthes (Achnanthidium) together with a re-definition of Achnanthidium. Diatom Research 11: 345-361.

Van Heurck, H. (1881). Synopsis des Diatomées de Belgique. Atlas. Ducaju & Cie., Anvers. pls 31-77.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Planothidium dubium CAS

North American Diatom Ecological Database (NADED)

NADED ID: 155021

Autecology Discussion