Triquetrorhabdulus rioi

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Thu, 31/01/2008 - 13:52 — Jeremy Young

Citation:

Triquetrorhabdulus rioi Olafsson, 1989

Description: Narrow, straight-sided species of Triquetrorhabdulus with c-axis perpendicular to length of nannolith.

Remarks: Similar to T. carinatus in shape but with c-axis perpendicular to length of nannolith. Often lie in an orientation in which they show birefringence, so gypsum plate is useful toshow that they have c-axis perpendicular rather than parallel to nannolith length. N.B. rioi is a corrected form of the name rioensis as originally proposed by Olafsson (1989).

Range: NN6-7.