Navicula longicephala
Hustedt 1944 Category: Symmetrical biraphid
BASIONYM: Navicula longicephala Hustedt 1944
REPORTED AS: Navicula bicephala (Patrick & Reimer 1966)
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - March 2011
Length Range: 17-22 µm
Width Range: 3.1-4.0 µm
Striae in 10 µm: 18-21
Description
Valves are linear with rostrate to capitate apices. The axial area is narrow and straight. The central area is small. The raphe is straight, with close proximal ends. Striae are strongly radiate around the center, becoming convergent at the apices. The areolae are indistinguishable under LM, approximately 50 in 10 μm.
Original Description
Basionym: Navicula longicephala
Author: Hustedt 1944
Length Range: 19-22 µm
Width Range: 3-4 µm
Striae in 10 µm: 18-20
Original Description
Navicula longicephala nov. spec. Schalen schmal linear mit parallelen Seiten und schmalen, kopfig abgeschnürten und ziemlich lang geschnäbelten Enden, 19-22 µ lang, 3-4 µ breit. Raphe gerade, fadenförmig, Polspalten undeutlich, sehr klein. Axialarea sehr schmal linear, um den Zentralknoten etwas quer erweitert und eine kleine Zentralarea bildend. Transapikalrippen 18-20 in 10 µ, im mittleren Teil radial, an den Enden senkrecht zur Mittellinie, Längslinien sehr zart und kaum erkennbar. Fig. 17.
Original Images
Cite This Page:
Potapova, M. (2011). Navicula longicephala . In Diatoms of the United States. Retrieved June 18, 2013, from http://westerndiatoms.colorado.edu/taxa/species/navicula_longicephala
Species: Navicula longicephala
Contributor: Marina Potapova
Reviewer: Sarah Spaulding
Image Credit: Marina Potapova
- Valves linear
- Valves 3.1-4.0 μm wide
- Valve apices rostrate to capitate
- Central striae strongly radiate
- Striae 18-21 in 10 μm
Valves are linear with rostrate to capitate apices. The raphe is straight, with close proximal ends. Striae are strongly radiate around the center, becoming convergent at the apices. The areolae are indistinguishable under LM.
Compare
Navicula vilaplanii is similar, but has only slightly protracted apices.
Navicula vilaplanii
Citations
Hustedt, F. (1944). Neue und wenig bekannte Diatomeen. Bericht der Deutschen Botanischen Gessellschaft 61:271-290.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 46507