Pliocene four-rayed discoasters from IODP Expedition 363 sites in the eastern Indian Ocean and western Pacific Ocean

Allan Gil S. Fernando , Tom Dunkley Jones , Luc L Beaufort (1) , Denise K Kulhanek , Yvonne Ivy L. Doyongan , Ana Marie E Binuya , Jaan Rcp Nogot , Mirko Alessandro C. Uy

1 CEREGE - Centre européen de recherche et d'enseignement des géosciences de l'environnement

The stratigraphic distribution, occurrence and possible biostratigraphic significance of several previously- undescribed and rarely-reported four-rayed discoasters are described. The discoasters were observed in Zones NN10 to NN18 (Upper Miocene to Lower Pleistocene) in cores recovered from International Ocean Discovery Program Expedition 363 sites in the eastern Indian Ocean (offshore NW Australia) and western Pacific Ocean. One of the discoasters is a bilaterally-symmetrical form with simple ray-tip morphology, which is herein described as the new species Discoaster alyssae. Three new varieties are also introduced––Discoaster surculus var. pullumpedes, D. variabilis var. pacificus and D. exilis var. resolutioniae.

Domaines: Paléontologie

Allan Gil S. Fernando, Tom Dunkley Jones, Luc L Beaufort, Denise K Kulhanek, Yvonne Ivy L. Doyongan, et al.. Pliocene four-rayed discoasters from IODP Expedition 363 sites in the eastern Indian Ocean and western Pacific Ocean. Journal of Nannoplankton Research, 2020, 38 (1), pp.49-55. ⟨hal-03038703⟩