Splitting one species into 22: an unusual tripling of molecular, morphological, and geographical differentiation in the fern family Didymochlaenaceae (Polypodiales)

doi:10.1111/cla.12539

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	Splitting one species into 22: an unusual tripling of molecular, morphological, and geographical differentiation in the fern family Didymochlaenaceae (Polypodiales)
	Shang,Hui; Xue,Zhi-Qing; Liang,Zhen-Long; Kessler,Michael; Pollawatn,Rossarin; Lu,Ngan Thi; Gu,Yu-Feng; Fan,Xue-Ping; Tan,Yun-Hong; Zhang,Liang; Zhou,Xin-Mao; Wan,Xia; Zhang,Li-Bing
	2023
发表期刊	CLADISTICS
ISSN	1096-0031
卷号	39 期号:4 页码:273-292
摘要	The pantropical fern genus Didymochlaena (Didymochlaenaceae) has long been considered to contain one species only. Recent studies have resolved this genus/family as either sister to the rest of eupolypods I or as the second branching lineage of eupolypods I, and have shown that this genus is not monospecific, but the exact species diversity is unknown. In this study, a new phylogeny is reconstructed based on an expanded taxon sampling and six molecular markers. Our major results include: (i) Didymochlaena is moderately or weakly supported as sister to the rest of eupolypods I, highlighting the difficulty in resolving the relationships of this important fern lineage in the polypods; (ii) species in Didymochlaena are resolved into a New World clade and an Old World clade, and the latter further into an African clade and an Asian-Pacific clade; (iii) an unusual tripling of molecular, morphological and geographical differentiation in Didymochlaena is detected, suggesting single vicariance or dispersal events in individual regions and no evidence for reversals at all, followed by allopatric speciation at more or less homogeneous rates; (iv) evolution of 18 morphological characters is inferred and two morphological synapomorphies defining the family are recognized-the elliptical sori and fewer than 10 sori per pinnule, the latter never having been suggested before; (v) based on morphological and molecular variation, 22 species in the genus are recognized contrasting with earlier estimates of between one and a few; and (vi) our biogeographical analysis suggests an origin for Didymochlaena in the latest Jurassic-earliest Cretaceous and the initial diversification of the extant lineages in the Miocene-all but one species diverged from their sisters within the last 27 Myr, in most cases associated with allopatric speciation owing to geologic and climatic events, or dispersal.
关键词	PHYLOGENETIC ANALYSIS DEEP RELATIONSHIPS RAPID RADIATION EVOLUTION GENUS CLASSIFICATION BIOGEOGRAPHY HISTORY DIVERSIFICATION PARSIMONY
学科领域	Evolutionary Biology ; Zoology
DOI	10.1111/cla.12539
收录类别	SCI
WOS记录号	WOS:000975850100001
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/75445
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Shang,Hui,Xue,Zhi-Qing,Liang,Zhen-Long,et al. Splitting one species into 22: an unusual tripling of molecular, morphological, and geographical differentiation in the fern family Didymochlaenaceae (Polypodiales)[J]. CLADISTICS,2023,39(4):273-292.
APA	Shang,Hui.,Xue,Zhi-Qing.,Liang,Zhen-Long.,Kessler,Michael.,Pollawatn,Rossarin.,...&Zhang,Li-Bing.(2023).Splitting one species into 22: an unusual tripling of molecular, morphological, and geographical differentiation in the fern family Didymochlaenaceae (Polypodiales).CLADISTICS,39(4),273-292.
MLA	Shang,Hui,et al."Splitting one species into 22: an unusual tripling of molecular, morphological, and geographical differentiation in the fern family Didymochlaenaceae (Polypodiales)".CLADISTICS 39.4(2023):273-292.

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