Platessa hustedtii
(Krasske) Lange-Bertalot in Krammer and Lange-Bertalot 2004 Category: Monoraphid
BASIONYM: Cocconeis hustedtii Krasske 1923
SYNONYM(S): Achnanthes hustedtii (Krasske) Reimer in Patrick and Reimer
REPORTED AS: Achnanthes rupestoides (Hohn)
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - November 2011
Length Range: 11-15 µm
Width Range: 5.0-6.4 µm
Striae in 10 µm: 15-18
Description
Valves are elliptical. The raphe valve has a narrow axial area and a transversely elliptical or rectangular central area. The rapheless valve has a wide lanceolate axial area and no distinct central area. The raphe is straight, with slightly expanded terminal and central ends, and lacks terminal fissures. Striae are radiate and biseriate. The external and internal openings of the areolae are circular or somewhat angular and isodiametric.
Original Description
Basionym: Cocconeis hustedtii
Author: Krasske 1923
Length Range: 12-17 µm
Width Range: 5-7 µm
Striae in 10 µm: 19-22 on raphe valve, 18-20 on rapheless valve
Original Description
Cocconeis Hustedtii nov. spec. -(Fig. 10a, b). - Elliptisch, Oberschale mit kurzen, leicht strahlenden Streifen, 18 - 20 in 10µ, die eine breit lanzettliche Pseudoraphe von etwa einem Drittel der Schalenbreite freilassen. Unterschale: enge Axial-Area und breite quadratische Zentralarea, Streifen etwas enger, 19 - 22 in 10µ. Länge 12 - 17 µ, Breite 5 - 7 µ.- Fundort : Wand eines Schulaquariums,hier trotz öfterer Reinigung stets in Massen. Doch auch in Aquarien des Herrn LOUIS SCHLUZE Cassel beobachtet.
Original Images
Cite This Page:
Potapova, M. (2011). Platessa hustedtii. In Diatoms of the United States. Retrieved May 25, 2013, from http://westerndiatoms.colorado.edu/taxa/species/platessa_hustedtii
Species: Platessa hustedtii
Contributor: Marina Potapova
Reviewer: Sarah Spaulding
Image Credit: Marina Potapova
- Valves elliptical
- Axial area on raphe valve narrow
- Central area on raphe valve transversely elliptical or rectangular
- Rapheless valve with wide lanceolate axial area
- Stria density 15-18 in 10 µ on both valves
Valves are elliptical. The raphe valve has a narrow axial area and a transversely elliptical or rectangular central area. The rapheless valve has a wide lanceolate axial area and lacks a distinct central area.
Compare
Platessa hustedtii can be distinguished from Psammothidium marginulatum and P. daonense by broader and sparser striae. Platessa rupestris has more lanceolate valves with wider axial and central areas on the raphe valve. Platessa montana has rhomboid-elliptical valves and a higher stria density. Rapheless valves of P. hustedtii and Achnanthes lutheri can be confused, but A. lutheri can be distinguished by higher stria density on the raphe valve.
Psammothidium marginulatum
Psammothidium daonense
Platessa montana
(Krasske) Lange-Bertalot in Krammer & Lange-Bertalot
Platessa rupestris
(Krasske) H. Lange-Bertalot in Krammer & Lange-Bertalot
Achnanthes lutheri
Hustedt
Citations
Krammer, K. and Lange-Bertalot, H. (2004). Bacillariophyceae 4. Teil: Achnanthaceae, Kritische Erganzungen zu Navicula (Lineolatae), Gomphonema Gesamtliteraturverzeichnis Teil 1-4 [second revised edition]. In: H. Ettl et al., Suesswasserflora von Mitteleuropa. Spektrum Akademischer Verlad Heidelberg, 468 pp.
Krasske, G. (1923). Die Diatomeen des Casseler Beckens und seiner Randgebirge, nebst einigen wichtigen funden aus Niederhessen. Botanisches Archiv. Konigsberg 3(4):185-209.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 2508004