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Diversity, taxonomy, and history of the tropical fern genus Didymoglossum Desv. (Hymenophyllaceae, Polypodiidae) in Africa
Journal of Systematics and Evolution ( IF 3.4 ) Pub Date : 2023-02-20 , DOI: 10.1111/jse.12951 Jean‐Yves Dubuisson 1 , Adèle Nivart 1 , Ehoarn Bidault 2, 3 , Vincent Deblauwe 4, 5, 6 , Vincent Droissart 4, 7, 8 , Narcisse G. Kamdem 8 , Germinal Rouhan 3 , Atsushi Ebihara 9 , Timothée le Péchon 10, 11
Journal of Systematics and Evolution ( IF 3.4 ) Pub Date : 2023-02-20 , DOI: 10.1111/jse.12951 Jean‐Yves Dubuisson 1 , Adèle Nivart 1 , Ehoarn Bidault 2, 3 , Vincent Deblauwe 4, 5, 6 , Vincent Droissart 4, 7, 8 , Narcisse G. Kamdem 8 , Germinal Rouhan 3 , Atsushi Ebihara 9 , Timothée le Péchon 10, 11
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The fern genus Didymoglossum (Hymenophyllaceae) is not so diverse in Africa with seven species at most. However, its local taxonomy is surprisingly still strongly debated, in particular within the Didymoglossum erosum complex interpreted either as a single polymorphic species or as a group of at least three distinct but morphologically very close taxa (D. erosum, Didymoglossum chamaedrys, and Didymoglossum benlii). Investigating these taxonomic issues and more generally the diversity of the genus in Africa and its origin, we conducted a complete anatomo–morphological analysis coupled with a molecular phylogenetic work based on rbcL. Our results support the recognition of all seven species, including Didymoglossum robinsonii that is likely distinct from the Neotropical Didymoglossum reptans to which the African populations were traditionally attributed. We here propose new characters and a novel key to distinguish the seven African species which also include Didymoglossum ballardianum, Didymoglossum lenormandii, and Didymoglossum liberiense. Once the taxonomy is clarified with respect to the distinct evolutionary lineages evidenced, the biogeographic history of the genus in Africa is discussed based on a divergence time estimation and the reconstruction of the ancestral geographic areas. These analyses reveal a Mesozoic (Cretaceous) vicariance event within Didymoglossum which is the second one hypothesized for the family Hymenophyllaceae.
中文翻译：
热带蕨类植物 Didymoglossum Desv 的多样性、分类学和历史。（Hymenophyllaceae，Polypodiidae）在非洲
蕨类植物Didymoglossum（Hymenophyllaceae）在非洲的多样性并不丰富，最多有 7 种。然而，令人惊讶的是，其当地分类法仍然存在激烈争论，特别是在Didymoglossum erosum复合体中，被解释为单个多态物种或被解释为至少三个不同但形态上非常接近的分类群（D. erosum、Didymoglossum chamaedrys和Didymoglossum benlii ））。为了研究这些分类学问题以及更广泛的非洲属的多样性及其起源，我们进行了完整的解剖形态学分析以及基于rbcL 的分子系统发育工作。我们的结果支持对所有七个物种的认识，包括Didymoglossum robinsonii，它可能与非洲种群传统上归属的新热带Didymoglossum reptans不同。我们在这里提出了新的特征和新的关键来区分七个非洲物种，其中还包括Didymoglossum ballardianum、Didymoglossum lenormandii和Didymoglossum libereriense。一旦明确了所证明的不同进化谱系的分类学，就可以根据分歧时间估计和祖先地理区域的重建来讨论非洲该属的生物地理历史。这些分析揭示了Didymoglossum内的中生代（白垩纪）替代事件，这是Hymenophyllaceae 科的第二个假设事件。
更新日期：2023-02-20
中文翻译：
热带蕨类植物 Didymoglossum Desv 的多样性、分类学和历史。（Hymenophyllaceae，Polypodiidae）在非洲
蕨类植物Didymoglossum（Hymenophyllaceae）在非洲的多样性并不丰富，最多有 7 种。然而，令人惊讶的是，其当地分类法仍然存在激烈争论，特别是在Didymoglossum erosum复合体中，被解释为单个多态物种或被解释为至少三个不同但形态上非常接近的分类群（D. erosum、Didymoglossum chamaedrys和Didymoglossum benlii ））。为了研究这些分类学问题以及更广泛的非洲属的多样性及其起源，我们进行了完整的解剖形态学分析以及基于rbcL 的分子系统发育工作。我们的结果支持对所有七个物种的认识，包括Didymoglossum robinsonii，它可能与非洲种群传统上归属的新热带Didymoglossum reptans不同。我们在这里提出了新的特征和新的关键来区分七个非洲物种，其中还包括Didymoglossum ballardianum、Didymoglossum lenormandii和Didymoglossum libereriense。一旦明确了所证明的不同进化谱系的分类学，就可以根据分歧时间估计和祖先地理区域的重建来讨论非洲该属的生物地理历史。这些分析揭示了Didymoglossum内的中生代（白垩纪）替代事件，这是Hymenophyllaceae 科的第二个假设事件。
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