Some new acritarch species from the lower and middle Miocene of the Porcupine Basin, North Atlantic Ocean: biostratigraphy and palaeoecology

Six new acritarch species were observed during a high-resolution study on the upper Burdigalian to Serravallian (lower and middle Miocene) of the Porcupine Basin (Integrated Ocean Drilling Program Leg 307, off southwestern Ireland). The stratigraphical ranges and palaeoenvironmental preferences of the six new species were assessed. <i>Cometesphaera bullatio</i> gen. et sp. nov. is recorded from the upper Burdigalian to the lower Serravallian, while the range of <i>Cymatiosphaera</i>? <i>deverteuilii</i> sp. nov. is restricted to the upper Serravallian. <i>Platycystidia manumii</i> sp. nov. is recorded from the upper Burdigalian to the upper Langhian. <i>Porcupinea collaris</i> gen. et sp. nov. and <i>Porcupinea indentata</i> gen. et sp. nov. range from the upper Langhian to the lower Serravallian, and from the uppermost Burdigalian to the upper Serravallian, respectively. <i>Pusillisphaera solaris</i> gen. et sp. nov. is recorded from the from the upper Burdigalian to the upper Serravallian.

本研究对爱尔兰西南外海豪猪盆地（综合大洋钻探计划（Integrated Ocean Drilling Program）第307航次）的中新统下-中部布尔迪加尔阶上部至塞拉瓦尔阶地层开展了高分辨率研究，期间发现了6个疑源类（acritarch）新物种。研究对这6个新物种的地层延限范围与古环境偏好进行了系统评估。新属新种*Cometesphaera bullatio*的地层延限为布尔迪加尔阶上部至塞拉瓦尔阶下部；疑似*Cymatiosphaera*属的*deverteuilii*新种仅分布于塞拉瓦尔阶上部。*Platycystidia manumii*新种的地层延限为布尔迪加尔阶上部至兰盖阶上部。新属新种*Porcupinea collaris*与*Porcupinea indentata*的地层延限分别为兰盖阶上部至塞拉瓦尔阶下部、布尔迪加尔阶最上部至塞拉瓦尔阶上部。新属新种*Pusillisphaera solaris*的地层延限为布尔迪加尔阶上部至塞拉瓦尔阶上部。