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Tursicola costata has raised interstrial costae and strongly convergent striae.
Tursicola podocnemicola has linear-lanceolate valves, a wide rectangular stauros, deflected proximal raphe ends, and has been documented exclusively from the carapaces of the Amazon River turtle, Podocnemis erythrocephala.

LM scalebar = 10 µm
Tursiocola ziemanii LM2 Tursiocola ziemanii LM1 Tursiocola ziemanii LM3 Tursiocola ziemanii LM4 Tursiocola ziemanii LM5
Length Range
13-61 µm
Width Range
2.0-5.2 µm
Striae in 10 µm
22-34

Also compare to

Tursiocola costata

Frankovich and M.J.Sullivan

Tursiocola podocnemicola

Wetzel, Van de Vijver and Ector