Cited by 259Marine Invertebrate Physiology and EcologyGenomics and Phylogenetic StudiesProtist diversity and phylogeny

Phylogenomics provides a robust topology of the major cnidarian lineages and insights on the origins of key organismal traits

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Kayal, Ehsan, Bentlage, Bastian, Sabrina Pankey, M., Ohdera, Aki H., Medina, Monica, Plachetzki, David C., Collins, Allen G., Ryan, Joseph F.·2018·BMC Evolutionary Biology

Abstract

The phylogeny of Cnidaria has been a source of debate for decades, during which nearly all-possible relationships among the major lineages have been proposed. The ecological success of Cnidaria is predicated on several fascinating organismal innovations including stinging cells, symbiosis, colonial body plans and elaborate life histories. However, understanding the origins and subsequent diversification of these traits remains difficult due to persistent uncertainty surrounding the evolutionary relationships within Cnidaria. While recent phylogenomic studies have advanced our knowledge of the cnidarian tree of life, no analysis to date has included genome-scale data for each major cnidarian lineage. Here we describe a well-supported hypothesis for cnidarian phylogeny based on phylogenomic analyses of new and existing genome-scale data that includes representatives of all cnidarian classes. Our results are robust to alternative modes of phylogenetic estimation and phylogenomic dataset construction. We show that two popular phylogenomic matrix construction pipelines yield profoundly different datasets, both in the identities and in the functional classes of the loci they include, but resolve the same topology. We then leverage our phylogenetic resolution of Cnidaria to understand the character histories of several critical organismal traits. Ancestral state reconstruction analyses based on our phylogeny establish several notable organismal transitions in the evolutionary history of Cnidaria and depict the ancestral cnidarian as a solitary, non-symbiotic polyp that lacked a medusa stage. In addition, Bayes factor tests strongly suggest that symbiosis has evolved multiple times independently across the cnidarian radiation. Cnidaria have experienced more than 600 million years of independent evolution and in the process generated an array of organismal innovations. Our results add significant clarification on the cnidarian tree of life and the histories of some of these innovations. Further, we confirm the existence of Acraspeda (staurozoans plus scyphozoans and cubozoans), thus reviving an evolutionary hypothesis put forward more than a century ago.

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  1. [25]Collins AG Schuchert P Marques AC Jankowski T Medina M Schierwater B Medusozoan phylogeny and character evolution clarified by new large and small subunit rDNA data and an assessment of the utility of phylogenetic mixture models Syst Biol 2006 55 97 115 16507527
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  3. [50]Schmidt H. On evolution in the Anthozoa. Proceedings of the 2nd International Coral Reef Symposium. 1974;1:533–560.
  4. [66]Thiel H The evolution of Scyphozoa: a review 1966 London Academic Press
  5. [67]Ax P Multicellular animals 1996 Berlin; New York Springer

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Authors
Kayal, E., Bentlage, B., Sabrina Pankey, M., Ohdera, A. H., Medina, M., Plachetzki, D. C., Collins, A. G., & Ryan, J. F.
Affiliations
  • Smithsonian Institution (US)
  • Pennsylvania State University (US)
  • University of New Hampshire (US)
  • University of Florida (US)
Corresponding author
  • Plachetzki, David C.
  • Ryan, Joseph F.
Venue
BMC Evolutionary Biology
Published
2018-04-13
Volume
18
Issue
1
Pages
68
ISSN
1471-2148 (ISSN-L)
OpenAlex
W2807223659
Cited by
255
References
104
Citations by year
2026: 15 · 2025: 28 · 2024: 35 · 2023: 37 · 2022: 28 · 2021: 40 · 2020: 40 · 2019: 28 · 2018: 4
FWCI
20.61
Type
journal article
Language
en
Open access
Locations
  • BMC Evolutionary Biology (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • HAL (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • NOAA Institutional Repository (submittedVersion)
Funders
  • Smithsonian Institution
  • Directorate for Biological Sciences (OIA-1457769)
  • National Institute of Food and Agriculture (Hatch Project 00654)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Marine Invertebrate Physiology and Ecology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protist diversity and phylogeny
Keywords
genome-scale data, ancestral state reconstruction, symbiosis evolution, nematocysts, Scyphozoa, cubozoans

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