Round brown process-bearing cysts (RBPC) produced by dinoflagellates (Dinophyceae) occur as an important part of assemblage diversities in seafloor sediments worldwide. Here a new species, Islandinium pacificum, is described from surface sediment samples from coastal waters of British Columbia (Canada). Additional observations are made on material from the Holocene of Kyuquot Sound (Vancouver Island, Canada) and the Eemian of the Vøring Plateau (North Atlantic). The cysts have a smooth wall and bear acuminate processes with barbs. Incubation experiments reveal an affinity with the motile stage Protoperidinium mutsuense. The ecology of the new species is specified.
Bibliographical noteFunding Information:
Natural Sciences and Engineering Research Council of Canada. Anne de Vernal is acknowledged for helping to access residues from the Eemian of the Nordic Sea. We thank Eric Potvin for sharing morphometric data of Islandinium minutum subsp. barbatum. Ocean Networks Canada (ONC), R/V Thompson, and ROPOS (Remotely Operated Platform, Canadian Scientific Submersible Facility) teams are thanked for their assistance with sample collection in the Strait of Georgia and Saanich Inlet. We are grateful to A. Price for collecting one sediment sample in Oak Bay. We acknowledge Audrey Dallimore (RRU and PGC) for providing material from core 2012002PCG133 from Kyuquot Sound. This work was partially funded by the Natural Sciences and Engineering Research Council of Canada (NSERC) through a Discovery Grant (RGPIN/6388-2015) to V. Pospelova. The Regional Council of Brittany, the General Council of Finist?re and the urban community of Concarneau-Cornouaille-Agglom?ration are acknowledged for the funding of the Sigma 300 FE-SEM of the station of Marine Biology in Concarneau.
© 2019, © 2019 AASP–The Palynological Society.
Copyright 2020 Elsevier B.V., All rights reserved.
- Atlantic Ocean
- Pacific Ocean
- Round brown process-bearing cyst
- Saanich Inlet
- cyst–theca relationship