(8)
Nannoliths (5)
Triquetrorhabdulaceae (2)
Triquetrorhabdulus (2)
T. carinatus group (3)
Triquetrorhabdulus challengeri
Description: Short broad species with two wide blades bearing one to four subsidiary ridges parallel to a shorted median lath. Optic axis parallel to length.
Remarks:
Size: 8-15 microns long, typically about half as wide as long.
Range: NN1-2