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Lindavia bodanica has a higher stria density (13-15 in 10 µm) and the central areolae are more radial. 
Lindavia radiosa has shorter and more dense stria (15-18 in 10 µm)strictly radial central areolae, often with a single areola in the center of the valve, and the exterior of the central area is radially wrinkled.

LM scalebar = 10 µm
Lindavia intermedia LM2 Lindavia intermedia LM1 Lindavia intermedia LM3 Lindavia intermedia LM5 Lindavia intermedia LM5 Lindavia intermedia LM6 Lindavia intermedia LM7
Diameter
12-34 µm
Striae in 10 µm
11-13

Lindavia radiosa

(Grunow) De Toni and Forti 1900

Lindavia radiosa LM2 Lindavia radiosa LM1 Lindavia radiosa LM3 Lindavia radiosa LM4 Lindavia radiosa LM5 Lindavia radiosa LM6 Lindavia radiosa LM7
Diameter
10.9-23.8 µm
Striae in 10 µm
14-18

Lindavia bodanica

(Eulenst. ex Grunow) Nakov et al. 2015

Lindavia bodanica LM1 Lindavia bodanica LM3 Lindavia bodanica LM5 Lindavia bodanica LM2 Lindavia bodanica LM7 Lindavia bodanica LM4 Lindavia bodanica LM6
Diameter
18-38 µm
Striae in 10 µm
10-14 based on circumferential density