(Grunow in Van Heurck) Krammer 1991 Category: Centric
BASIONYM: Melosira crenulata var. valida Grunow in Van Heurck 1882
SYNONYM(S): Melosira valida (Grunow in Van Heurck) Meister
Frustules are cylindrical and form chains. Valves are 7-16 µm in diameter, with a mantle height of 7-16 µm. The ratio of the mantle height to valve diameter is 0.8-1.5. The mantle has thick walls. The valve face is slightly convex, covered by small areolae. Pervalvar rows of coarse, rectangular areolae are strongly curved to the right (dextrorse), 12-17 in 10 µm. There are 11-17 areolae in 10 µm along the pervalvar row. The mantle areolae are larger near the valve face and gradually become smaller toward the collum. The collum is approximately 1/3-1/5 of the mantle height. The spines are large, spatula-shaped and originate from two pervalvar costae. The ringleiste is solid and wide.
Basionym: Melosira crenulata var. valida
Author: Grunow in Van Heurck 1882
Rows of areolae in 10 µm:
Cite This Page:
English, J., and Potapova, M. (2010). Aulacoseira valida. In Diatoms of the United States. Retrieved April 25, 2017, from http://westerndiatoms.colorado.edu/taxa/species/aulacoseira_valida
Species: Aulacoseira valida
Reviewer: Sarah Spaulding
Houk, V., Klee, R. and Passauer, U. (2007). Observations on taxa of Melosira sensu lato among the slides from the Grunow diatom collection in Vienna (Austria). Part. 1. Diatom Research 22: 57-80.
Krammer, K. (1991). Morphology and taxonomy in some taxa of the genus Aulacoseira Thwaites (Bacillariophyceae). II. Taxa in the A. granulata-. italica- and lirata-groups. Nova Hedwigia 53: 477-496.