Abstract

Phelodinium fensomei is a new species of organic-walled dinoflagellate cyst described from the Appian Way section of the Oyster Bay Formation, Vancouver Island, British Columbia, Canada. Phelodinium fensomei sp. nov. differs from other species of Phelodinium in its unique combination of characters including an elongate epicyst, bilobate endocyst antapex, and microgranulate to verrucate surface ornamentation. The species occurs exclusively within Dinoflagellate Cyst Zone D4 of the Oyster Bay Formation along with the Danian indicator taxon Danea californica. This is also the first study to perform scanning electron microscopy and epifluorescence analysis on a specimen belonging to the protoperidinioid genus Phelodinium, revealing minute features and a negative response to ultraviolet light exposure, indicating a heterotrophic feeding strategy for the motile cell. Although P. fensomei sp. nov. occurs at markedly low relative and absolute abundances in the examined interval, it is restricted to strata of Danian age suggesting potential biostratigraphic utility.

摘要

Phelodinium fensomei是一种新的有机壁甲藻包囊，描述于加拿大不列颠哥伦比亚省温哥华岛牡蛎湾组的 Appian Way 部分。Phelodinium fensomei sp。十一月 区别于其他种类的Phelodinium，其独特的特征组合包括细长的外囊、双叶内囊和微颗粒到疣状表面装饰。该物种仅出现在牡蛎湾组的甲藻囊肿区 D4 以及达尼安指示分类群Danea californica 内。这也是第一项对属于 protoperidinioid 属Phelodinium的标本进行扫描电子显微镜和落射荧光分析的研究，揭示了微小的特征和对紫外线照射的负面反应，表明运动细胞的异养喂养策略。虽然P. fensomei sp. 十一月 在所检查的区间内发生在显着较低的相对和绝对丰度，它仅限于大年时代的地层，表明潜在的生物地层效用。