(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
Length Range: µm
Striae in 10 µm:
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.