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In the mobile mount.
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Triquetrorhabdulus inversus Bukry & Bramlette, 1969
Pseudotriquetrorhabdulus inversus (Bukry & Bramlette, 1969) Wise in Wise & Constans, 1976 [invalid]
Wiseorhabdus inversus (Bukry & Bramlette 1969) Bukry 1981
Blackites inversus (Bukry & Bramlette, 1969) Bown & Newsam, 2017
Triquetrorhabdulus inversus exhibits parallel extinction with length slow (+) elongation, while Blackites display inclined extinction.
Bown, P. R. & Newsam, C. 2017. Calcareous nannofossils from the Eocene North Atlantic Ocean (IODP Expedition 342 Sites U1403–1411). Journal of Nannoplankton Research 37(1): 25-60.
Bukry, D., Bramlette, M. N., 1969b. Some new and stratigraphically useful calcareous nannofossils of the Cenozoic. Tulane Studies in Geology 7, 131-142.
Wise, S. W., 1983. Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 71 in the Falkland Plateau region, Southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project 71, 481-550.
Wise, S. W. & Constans, R. E. 1976. Mid Eocene plankton correlations Northern Italy - Jamaica W.I. Transactions of the Gulf-Coast Association of Geological Societies. 26: 144-155.
Triquetrorhabdulus inversus
Bukry & Bramlette, 1969
Middle Eocene
JOIDES, Blake Plateau, Atlantic Ocean.