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Molecular phylogenetics of the genus Costularia (Schoeneae, Cyperaceae) reveals multiple distinct evolutionary lineages

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Abstract
We investigated the monophyly of Costularia (25 species), a genus of tribe Schoeneae (Cyperaceae) that illustrates a remarkable distribution pattern from southeastern Africa, over Madagascar, the Mascarenes and Seychelles, to Malesia and New Caledonia. A further species, Tetraria borneensis, has been suggested to belong to Costularia. Relationships and divergence times were inferred using an existing four marker phylogeny of Cyperaceae tribe Schoeneae expanded with newly generated sequence data mainly for Costularia s.l. species. Phylogenetic reconstruction was executed using Bayesian inference and maximum likelihood approaches. Divergence times were estimated using a relaxed molecular clock model, calibrated with fossil data. Based on our results, Tetraria borneensis is not related to the species of Costularia. Costularia s.l. is composed of four distinct evolutionary lineages. Two lineages, one including the type species, are part of the Oreobolus clade, i.e. a much reduced genus Costularia restricted to southeastern Africa, Madagascar, the Mascarenes and Seychelles, and a small endemic genus from New Caledonia for which a new genus Chamaedendron is erected based on Costularia subgenus Chamaedendron. The other two lineages are part of the Tricostularia clade, i.e. a separate single-species lineage from the Seychelles for which a new genus (Xyroschoenus) is described, and Costularia subgenus Lophoschoenus. For the latter, more research is needed to test whether they are congeneric with the species placed in the reticulate-sheathed Tetraria clade.
Keywords
Costularia, Cyperaceae, Lophoschoenus, Madagascar, Molecular phylogeny, Monophyly, New Caledonia, New genus, Schoeneae, NUCLEAR RIBOSOMAL DNA, SEQUENCE DATA, SOUTHERN AFRICA, SEDGES CYPERACEAE, SUPRAGENERIC PHYLOGENY, BIODIVERSITY HOTSPOTS, GENERIC DELIMITATION, TETRARIA CYPERACEAE, CAREX CYPERACEAE, CONSERVED TYPE

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Citation

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Chicago
Larridon, Isabel, Kenneth Bauters, Ilias Semmouri, Jan-Adriaan Viljoen, Christina J Prychid, A Muthama Muasya, Jeremy J Bruhl, Karen L Wilson, Bruno Senterre, and Paul Goetghebeur. 2018. “Molecular Phylogenetics of the Genus Costularia (Schoeneae, Cyperaceae) Reveals Multiple Distinct Evolutionary Lineages.” Molecular Phylogenetics and Evolution 126: 196–209.
APA
Larridon, I., Bauters, K., Semmouri, I., Viljoen, J.-A., Prychid, C. J., Muasya, A. M., Bruhl, J. J., et al. (2018). Molecular phylogenetics of the genus Costularia (Schoeneae, Cyperaceae) reveals multiple distinct evolutionary lineages. MOLECULAR PHYLOGENETICS AND EVOLUTION, 126, 196–209.
Vancouver
1.
Larridon I, Bauters K, Semmouri I, Viljoen J-A, Prychid CJ, Muasya AM, et al. Molecular phylogenetics of the genus Costularia (Schoeneae, Cyperaceae) reveals multiple distinct evolutionary lineages. MOLECULAR PHYLOGENETICS AND EVOLUTION. 2018;126:196–209.
MLA
Larridon, Isabel, Kenneth Bauters, Ilias Semmouri, et al. “Molecular Phylogenetics of the Genus Costularia (Schoeneae, Cyperaceae) Reveals Multiple Distinct Evolutionary Lineages.” MOLECULAR PHYLOGENETICS AND EVOLUTION 126 (2018): 196–209. Print.
@article{8559943,
  abstract     = {We investigated the monophyly of Costularia (25 species), a genus of tribe Schoeneae (Cyperaceae) that illustrates a remarkable distribution pattern from southeastern Africa, over Madagascar, the Mascarenes and Seychelles, to Malesia and New Caledonia. A further species, Tetraria borneensis, has been suggested to belong to Costularia. Relationships and divergence times were inferred using an existing four marker phylogeny of Cyperaceae tribe Schoeneae expanded with newly generated sequence data mainly for Costularia s.l. species. Phylogenetic reconstruction was executed using Bayesian inference and maximum likelihood approaches. Divergence times were estimated using a relaxed molecular clock model, calibrated with fossil data. Based on our results, Tetraria borneensis is not related to the species of Costularia. Costularia s.l. is composed of four distinct evolutionary lineages. Two lineages, one including the type species, are part of the Oreobolus clade, i.e. a much reduced genus Costularia restricted to southeastern Africa, Madagascar, the Mascarenes and Seychelles, and a small endemic genus from New Caledonia for which a new genus Chamaedendron is erected based on Costularia subgenus Chamaedendron. The other two lineages are part of the Tricostularia clade, i.e. a separate single-species lineage from the Seychelles for which a new genus (Xyroschoenus) is described, and Costularia subgenus Lophoschoenus. For the latter, more research is needed to test whether they are congeneric with the species placed in the reticulate-sheathed Tetraria clade.},
  author       = {Larridon, Isabel and Bauters, Kenneth and Semmouri, Ilias and Viljoen, Jan-Adriaan and Prychid, Christina J and Muasya, A Muthama and Bruhl, Jeremy J and Wilson, Karen L and Senterre, Bruno and Goetghebeur, Paul},
  issn         = {1055-7903},
  journal      = {MOLECULAR PHYLOGENETICS AND EVOLUTION},
  keyword      = {Costularia,Cyperaceae,Lophoschoenus,Madagascar,Molecular phylogeny,Monophyly,New Caledonia,New genus,Schoeneae,NUCLEAR RIBOSOMAL DNA,SEQUENCE DATA,SOUTHERN AFRICA,SEDGES CYPERACEAE,SUPRAGENERIC PHYLOGENY,BIODIVERSITY HOTSPOTS,GENERIC DELIMITATION,TETRARIA CYPERACEAE,CAREX CYPERACEAE,CONSERVED TYPE},
  language     = {eng},
  pages        = {196--209},
  title        = {Molecular phylogenetics of the genus Costularia (Schoeneae, Cyperaceae) reveals multiple distinct evolutionary lineages},
  url          = {http://dx.doi.org/10.1016/j.ympev.2018.04.016},
  volume       = {126},
  year         = {2018},
}

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