Compare

Cavinula cocconeiformis has a smaller, oval to linear-lanceolate central area. Cavinula variostriata has more linear valves and a larger central area.

LM scalebar = 10 µm
Cavinula davisiae LM1 Cavinula davisiae LM2 Cavinula davisiae LM3 Cavinula davisiae LM4 Cavinula davisiae LM5 Cavinula davisiae LM6 Cavinula davisiae LM7
Length Range
14-31 µm
Width Range
7.5-9.9 µm
Striae in 10 µm
26-32

Cavinula cocconeiformis

(Gregory ex Grev.) D.G.Mann and Stickle in Round, R.M.Crawford and D.G.Mann 1990

Cavinula cocconeiformis LM7 Cavinula cocconeiformis LM1 Cavinula cocconeiformis LM2 Cavinula cocconeiformis LM3 Cavinula cocconeiformis LM4 Cavinula cocconeiformis LM5
Length Range
9-28 µm
Width Range
6-9 µm
Striae in 10 µm
26-32 in the center valve, 28-34 at the ends

Also compare to

Cavinula variostriata

(Krasske) D.G.Mann