Navicula streckerae

Lange-Bertalot and Witkowski in Witkowski et al. 2000      Category: Symmetrical biraphid
BASIONYM: Navicula streckerae Lange-Bertalot and Witkowski 2000

Navicula staffordiae

 

Navicula subconcentrica

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Loren Bahls - November 2011
Length Range: 32-60 µm
Width Range: 8.1-10.4 µm
Striae in 10 µm: 10-11

Description

Valves are lanceolate with obtusely rounded ends that are short and cuneate in small specimens to long and protracted in larger specimens. The axial is area narrow, widening into a variable rhombic to transversely elliptic central area. The raphe is lateral. Proximal raphe ends are nearly straight, inflated and deflected slightly to the primary side. Striae are strongly radiate at the center in larger valves, becoming parallel at the distinct Voigt discontinuities and then convergent near the apices. The striae are more widely and irregularly spaced in the center of the valve. Areolae are very coarse and number 20-22 in 10 µm.



Original Description

Basionym: Navicula streckerae
Author: Lange-Bertalot and Witkowski 2000
Length Range: 26-55 µm
Width Range: 8-10.5 µm
Striae in 10 µm: 9-10

Original Description

Valvae stricte lanceolatae apicibus curte cuneatim (quoad specimina minora) vel distincte longius protractis paene subcapitatis (quoad specimina minora) polis semper obtuse rotundatis. Longitudo 26-55 microns, latitudo 8-10.5 microns. Fissurae externae internaeque raphis modice sed satis distincte laterales sitae fissuris esternis conspicue arcuatis cum poris cenralibus crassis ad latus primum valvae parum inclinatis (probabiliter sed non certe microscopo photonico). Area axialis angusta, area centralis saepe aliquantum variabilis ad instar plerumque transverse rectangularis vel elliptica vel rhombica. Striae transapicales fortius radiantes usque ad disordinationem Voigtii deinde subparallelae denque convergentes, 9-10 in 10 microns. Lineolae comparate crassae apparentes, 18-20 in 10 microns. Species nova plus minusve similis est speciebus diversis generis Navicula s. str. ut particulariter N. bourellyivera Lange-Bertalot et al. 1998, sed differt ad instar valvarum apicibus latius protractis et obtusius rotundatis item lineolis aliquantum distantius positis (18-20 versus 20-21 in 10 microns). Minus similis sunt: N. hanseatica, N. slesvicensis (illa est associata loco typico), N. pseudolanceolata, N. rhynchotella, N. kohlmaieri (vide supra et comparate in tabulis).

Original Images


Cite This Page:
Bahls, L. (2011). Navicula streckerae. In Diatoms of the United States. Retrieved November 26, 2014, from http://westerndiatoms.colorado.edu/taxa/species/navicula_streckerae

Species: Navicula streckerae

Contributor: Loren Bahls

Reviewer: Marina Potapova

Citations

Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.

Witkowski, A., Lange-Bertalot, H. and Metzeltin, D. (2000). Diatom Flora of Marine Coasts I. Iconographia Diatomologica 7: 1-925.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

Navicula streckerae CAS

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Navicula streckerae has been recorded infrequently in creeks and rivers on the Northwestern Great Plains and Wyoming Basin (MT, ND, SD, WY), where it prefers warm waters rich in electrolytes and organic nutrients. Common diatom associates of N. streckerae on the Great Plains include Planothidium engelbrechtii, Navicula namibica, Entomoneis alata, Navicula peregrina, Tryblionella levidensis, Surirella striatula, Tryblionella gracilis, Tryblionella compressa, Hippodonta hungarica, Navicula salinarum, Gyrosigma macrum, Navicula curtisterna, Fallacia tenera, Amphora delicatissima, Fallacia pygmaea, and Biremis circumtexta. In Europe, N. streckerae was described from inland salt springs in the Weser River catchment and has also been found in marine habitats (Arctic Ocean) and in the estuary of the Weser River near Bremerhaven, Germany (Witkowski et al. 2000).