Species with c-axis parallel to length of nannolith. These species always show high birefringence, and length-fast orientation.
| Typical specimens | morphology | range |
| |
T. carinatus - elongate, parallel sided | NP24-NN2 |
| |
T. challengeri - shorter with ridges on two of the blades | NN1-2 |
| |
T. milowii - shorter, lozenge shaped | NN1-6 |
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