A TAXONOMIC REVISION OF THE MADAGASCAR-ENDEMIC GENUS BEMANGIDIA (SAPOTACEAE), WITH DESCRIPTION OF A SECOND SPECIES

Carlos Boluda,Aina Randriarisoa,Yamama Naciri,Laurent Gautier

Edinburgh Journal of Botany（2023）

Conservatory and Botanical Garden of the City of Geneva

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Abstract

Bemangidia L.Gaut. (Sapotaceae) is a genus endemic to a restricted area in the southeastern lowland moist evergreen forests of Madagascar. It was published in 2013 to accommodate an undescribed species, Bemangidia lowryi L.Gaut., which showed a combination of characters unique in the family Sapotaceae. At the time of description, three atypical collections from the same locality but growing on a ridge, slightly higher in altitude, were already known. Although matching well with the Bemangidia genus, they were phenotypically different from B. lowryi and were therefore not included in the species description. In the present study, we evaluate whether these specimens correspond to a new species, using a combination of morphological and genetic data based on 638 nuclear genes. The results show that Bemangidia contains two lineages, each one corresponding to a different morphology, with a genetic branch length similar to those observed among species pairs in other genera of Sapotaceae. We conclude that the genetic and morphological differences are sufficient to consider the two lineages as two distinct species. Consequently, the genus is here revised and a second species described.

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【要点】：本文修订了马达加斯加特有属Bemangidia，基于形态学和遗传学数据确认了该属的两个物种，并描述了第二个新物种。

【方法】：研究采用形态学和基于638个核基因的遗传数据分析方法。

【实验】：通过对比分析确定了两个物种的遗传分支长度，并使用已知的三个标本进行验证，结果支持了两个物种的分类，新物种被命名为Bemangidia sp. nov.，但未提供具体数据集名称。

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