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Phylogeny of Medusozoa and the evolution of cnidarian life cycles
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Abstract To investigate the evolution of cnidarian life cycles, data from the small subunit of the ribosome are used to derive a phylogenetic hypothesis for Medusozoa. These data indicate that Cnidaria is monophyletic and composed of Anthozoa and Medusozoa. While Cubozoa and Hydrozoa are well supported clades, Scyphozoa appears to be paraphyletic. Stauromedusae is possibly the sister group of either Cubozoa or all other medusozoans. The phylogenetic results suggest that: the polyp probably preceded the medusa in the evolution of Cnidaria; within Hydrozoa, medusa development involving the entocodon is ancestral; within Trachylina, the polyp was lost and subsequently regained in the parasitic narcomedusans; within Siphonophorae, the float originated prior to swimming bells; stauromedusans are not likely to be descended from ancestors that produced medusae by strobilation; and cubozoan polyps are simplified from those of their ancestors, which possessed polyps with gastric septa and four mesogleal muscle bands and peristomial pits.
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“The absence of precambrian planktonic metazoans is consistent with our Early Cambrian estimate for the origin of the last common ancestor of living cnidarians, a population of animals whose life cycle lacked a medusa stage and thus was entirely benthic (49).”
From Estimating metazoan divergence times with a molecular clock (2004) · cites this paper as [49]
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“Based on morphological and 18S ribosomal RNA data, the Anthozoa appear to be the most ancestral class within the phylum (Bridge et al., 1995;Collins, 2002).”
From Evolutionary aspects of developmentally regulated helix-loop-helix transcription factors in striated muscle of jellyfish (2003) · cites this paper as Collins, 2002
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Cited by
Sorted by citations
The New View of Animal Phylogeny
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“Information on relationships within Cnidaria may be found in Bridge et al. (1995) and Collins (2000, 2002).”
BackgroundEstimating metazoan divergence times with a molecular clock
Peterson, K. J., Lyons, J. B., Nowak, K. S., Takacs, C. M., Wargo, M. J., & McPeek, M. A. (2004) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0401670101 · Cited by 461
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“2463”
BackgroundInfluentialCollins, A. G., Schuchert, P., Marques, A. C., Jankowski, T., Medina, M., & Schierwater, B. (2006) · Systematic Biology · doi:10.1080/10635150500433615 · Cited by 391
“The SSU data were not examined in this way because prior work already indicated the hypotheses likely to be favored by these data (Collins, 2002).”
BackgroundMethodResultInfluentialSelf-citationFauna of the Mediterranean Hydrozoa.
Bouillon, J., Medel, M. D., Pagès, F., Gili, J. M., Boero, F., & Gravili, C. (2004) · Scientia Marina · doi:10.3989/scimar.2004.68s25 · Cited by 359
Metadata
- Authors
- Collins, A. G.
- Affiliations
- University of California, Berkeley (US)
- Corresponding author
- Collins, A. G.
- ORCID
- Collins, A. G.
- Venue
- Journal of Evolutionary Biology
- Publisher
- Oxford University Press (OUP)
- Published
- 2002-05-01
- Volume
- 15
- Issue
- 3
- Pages
- 418-432
- ISSN
- 1010-061X (ISSN-L)
- 1420-9101
- OpenAlex
- W2098787235
- Cited by
- 355
- References
- 62
- Citations by year
- 2026: 11 · 2025: 8 · 2024: 9 · 2023: 12 · 2022: 16 · 2021: 10 · 2020: 6 · 2019: 13 · 2018: 15 · 2017: 19 · 2016: 21 · 2015: 27 · 2014: 15 · 2013: 9 · 2012: 7
- FWCI
- 17.71
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Journal of Evolutionary Biology (publishedVersion)
- Funders
- National Science Foundation (9814845)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Marine Invertebrate Physiology and Ecology
- Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Protist diversity and phylogeny
- Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Invertebrate Taxonomy and Ecology
- Keywords
- Medusozoa, Anthozoa, Cubozoa, Hydrozoa, Scyphozoa, Siphonophorae, strobilation, monophyly
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