Compare

Semiorbis rotundus, S. eliasiae, and S. hemicyclus all have more strongly arched valves.

LM scalebar = 10 µm
Semiorbis catillifera LM1 Semiorbis catillifera LM2 Semiorbis catillifera LM3 Semiorbis catillifera LM4 Semiorbis catillifera LM5 Semiorbis catillifera LM7 Semiorbis catillifera LM6
Length Range
17-40 µm
Width Range
4.8-5.3 µm
Striae in 10 µm
12-13

Semiorbis rotundus

G.Reid and D.M.Williams 2010

Semiorbis rotundus LM7 Semiorbis rotundus LM6 Semiorbis rotundus LM4 Semiorbis rotundus LM3 Semiorbis rotundus LM2 Semiorbis rotundus LM5 Semiorbis rotundus LM1
Length Range
32.9-45.1 µm
Width Range
3.9-4.8 µm
Striae in 10 µm
12-13

Semiorbis eliasiae

Edlund, D.R.L.Burge, N.A.Andresen and VanderMeulen 2021

Semiorbis eliasiae LM1 Semiorbis eliasiae LM2 Semiorbis eliasiae LM3 Semiorbis eliasiae LM4 Semiorbis eliasiae LM5 Semiorbis eliasiae LM6
Length Range
16.5-40.5 µm
Width Range
3.5-5.7 µm
Striae in 10 µm
8-12

Also compare to

Semiorbis hemicyclus

(Ehrenberg) R.M.Patrick in Patrick and Reimer

BioData Reference
Reid and Williams 2010 Fig 9-13