Abstract The genus Basella belongs to family Basellaceae and is comprised of five species. Out of these, Basella alba is pantropical in distribution, B. paniculata is endemic to south-eastern Africa and the other three species viz. B. excavata, B. leandriana and B. madagascariensis are endemic to Madagascar. The palynological study of an organic layer buried ~80 ka in Chaganacherry, Kerala revealed a rich diversity of rainforest pollen and estuarine/marine palynomorphs indicating warm and humid climate coupled with sea level high stand. The Basella pollen recorded from this sediment shows intermediate characters of two extant Basella species. While it resembles B. paniculata in being pantocolpate (20), it shows affinity with B. alba in sexine characters. The recovered pollen was therefore, ascertained to be a new species, named here as B. keralensis sp. nov. The age correlation of the studied sediment was carried out by fingerprinting (Rare Earth Elements) of Youngest Toba Tuff (YTT) (glass shards) which spread in the atmosphere through a volcanic eruption in Sumatra ~74 ka and also with marine palynomorph markers correlating the interglacial Marine Isotopic Stage 5a (~80 ka). It is inferred that earlier, the genus Basella comprised of six species out of which Basella keralensis sp. nov. became extinct and until now neither the fossil record nor the extant form of this is known in records from any part of the World.

中文翻译：

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一种已灭绝的巴塞拉种：来自印度喀拉拉邦沉积物（~80 ka）的花粉证据

摘要 巴氏菌属属于巴氏菌科，由五个种组成。其中，Basella alba 分布在泛热带，B. paniculata 是非洲东南部的特有种，其他三个物种即。B. excavata、B.leandriana 和 B. madagascariensis 是马达加斯加的特有种。对位于喀拉拉邦 Chaganacherry 约 80 ka 的有机层的孢粉学研究揭示了热带雨林花粉和河口/海洋孢粉形态的丰富多样性，表明气候温暖潮湿，加上海平面高。从该沉积物中记录的 Baseella 花粉显示了两种现存的 Baseella 物种的中间特征。虽然它类似于 B. pantocolpate (20)，但它在性特征方面显示出与 B. alba 的亲和力。因此，回收的花粉被确定为一个新物种，在此命名为 B. 喀拉拉松属 十一月 研究的沉积物的年龄相关性是通过最年轻的多巴凝灰岩 (YTT)（玻璃碎片）的指纹（稀土元素）进行的，这些凝灰岩通过苏门答腊岛~74 ka 的火山喷发在大气中扩散，并且还与海洋孢粉形标记相关联间冰期海洋同位素第 5a 阶段（~80 ka）。据推断，早先，巴氏杆菌属由六个物种组成，其中巴氏杆菌属。十一月 灭绝了，直到现在，世界任何地方的记录中都没有化石记录和现存形式。研究沉积物的年龄相关性是通过最年轻的多巴凝灰岩 (YTT)（玻璃碎片）的指纹（稀土元素）进行的间冰期海洋同位素第 5a 阶段（~80 ka）。据推断，早先，巴氏杆菌属由六个物种组成，其中巴氏杆菌属。十一月 已经灭绝，直到现在，世界任何地方的记录中都没有化石记录和现存形式。研究沉积物的年龄相关性是通过最年轻的多巴凝灰岩 (YTT)（玻璃碎片）的指纹（稀土元素）进行的间冰期海洋同位素第 5a 阶段（~80 ka）。据推断，早先，巴氏杆菌属由六个物种组成，其中巴氏杆菌属。十一月 已经灭绝，直到现在，世界任何地方的记录中都没有化石记录和现存形式。