Eiffellithus Reinhardt, 1965
The loxolith calcareous nannofossils are characterised by double walls and central structures, including axial or diagonal crosses or traverse bars. These central structures may or may not support a distal process.
Reinhardt, P. 1965. Neue Familien für fossile Kalkflagellaten (Coccolithophoriden, Coccolithineen). Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 7: 30-40.