Paraphyly

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Reptilia (green field) is a paraphyletic group comprising all amniotes (Amniota) except for two subgroups: Mammalia (mammals) and Aves (birds); therefore, Reptilia is not a clade. In contrast, Amniota itself is a clade, which is a monophyletic group.

In taxonomy, a group is paraphyletic if it consists of the group's last common ancestor and all descendants of that ancestor excluding a few—typically only one or two—monophyletic subgroups. The group is said to be paraphyletic with respect to the excluded subgroups. The arrangement of the members of a paraphyletic group is called a paraphyly. The term is commonly used in phylogenetics (a subfield of biology) and in linguistics.

The term was coined to apply to well-known taxa like Reptilia (reptiles) which, as commonly named and traditionally defined, is paraphyletic with respect to mammals and birds. Reptilia contains the last common ancestor of reptiles and all descendants of that ancestor—including all extant reptiles as well as the extinct synapsids—except for mammals and birds. Other commonly recognized paraphyletic groups include fish, monkeys, and lizards.[1]

If many subgroups are missing from the named group, it is said to be polyparaphyletic. A paraphyletic group cannot be a clade, or monophyletic group, which is any group of species that includes only a common ancestor and all of its descendants. Formally, a paraphyletic group is the relative complement of one or more subclades within a clade: removing one or more subclades leaves a paraphyletic group.

Etymology[edit]

The term paraphyly, or paraphyletic, derives from the two Ancient Greek words παρά (pará), meaning "beside, near", and φῦλον (phûlon), meaning "genus, species",[2][3] and refers to the situation in which one or several monophyletic subgroups of organisms (e.g., genera, species) are left apart from all other descendants of a unique common ancestor.

Conversely, the term monophyly, or monophyletic, builds on the Ancient Greek prefix μόνος (mónos), meaning "alone, only, unique",[2][3] and refers to the fact that a monophyletic group includes organisms consisting of all the descendants of a unique common ancestor.

By comparison, the term polyphyly, or polyphyletic, uses the ancient greek prefix πολύς (polús), meaning "many, a lot of",[2][3] and refers to the fact that a polyphyletic group includes organisms arising from multiple ancestral sources.

Phylogenetics[edit]

Cladogram of the primates, showing a monophyly (the simians, in yellow), a paraphyly (the prosimians, in blue, including the red patch), and a polyphyly (the night-active primates, the lorises and the tarsiers, in red).

In cladistics[edit]

Groups that include all the descendants of a common ancestor are said to be monophyletic. A paraphyletic group is a monophyletic group from which one or more subsidiary clades (monophyletic groups) are excluded to form a separate group. Ereshefsky has argued that paraphyletic taxa are the result of anagenesis in the excluded group or groups.[4]

A group whose identifying features evolved convergently in two or more lineages is polyphyletic (Greek πολύς [polys], "many"). More broadly, any taxon that is not paraphyletic or monophyletic can be called polyphyletic.

These terms were developed during the debates of the 1960s and 1970s accompanying the rise of cladistics.

Examples of paraphyletic groups[edit]

Wasps are paraphyletic, consisting of the clade Apocrita without ants and bees, which are not usually considered to be wasps; the sawflies ("Symphyta") too are paraphyletic, as the Apocrita are nested inside the Symphytan clades.

The prokaryotes (single-celled life forms without cell nuclei), because they exclude the eukaryotes, a descendant group. Bacteria and Archaea are prokaryotes, but archaea and eukaryotes share a common ancestor that is not ancestral to the bacteria. The prokaryote/eukaryote distinction was proposed by Edouard Chatton in 1937[5] and was generally accepted after being adopted by Roger Stanier and C.B. van Niel in 1962. The botanical code (the ICBN, now the ICN) abandoned consideration of bacterial nomenclature in 1975; currently, prokaryotic nomenclature is regulated under the ICNB with a starting date of January 1, 1980 (in contrast to a 1753 start date under the ICBN/ICN).[6]

Among plants, dicotyledons (in the traditional sense) are paraphyletic because the group excludes monocotyledons. "Dicotyledon" has not been used as an ICBN classification for decades, but is allowed as a synonym of Magnoliopsida.[note 1] Phylogenetic analysis indicates that the monocots are a development from a dicot ancestor. Excluding monocots from the dicots makes the latter a paraphyletic group.[7]

Among animals, several familiar groups are not in fact clades. The order Artiodactyla (even-toed ungulates), because it excludes Cetaceans (whales, dolphins, etc.). In the ICZN Code, the two taxa are orders of equal rank. Molecular studies, however, have shown that the Cetacea descend from Artiodactyl ancestors, although the precise phylogeny within the order remains uncertain. Without the Cetacean descendants the Artiodactyls must be paraphyletic.[8] The class Reptilia as traditionally defined, is paraphyletic because it excludes birds (class Aves) and mammals. In the ICZN Code, the three taxa are classes of equal rank. However, mammals hail from the synapsids (which were once described as "mammal-like reptiles") and birds are descended from the dinosaurs (a group of Diapsida), both of which are reptiles.[9] Alternatively, reptiles are paraphyletic because they gave rise to (only) birds. Birds and reptiles together make Sauropsids. Osteichthyes, bony fish, are paraphyletic when they include only Actinopterygii (ray-finned fish) and Sarcopterygii (lungfish, etc.), excluding tetrapods; more recently, Osteichthyes is treated as a clade, including the tetrapods.[10][11] The wasps are paraphyletic, consisting of the narrow-waisted Apocrita without the ants and bees.[12] The sawflies (Symphyta) are similarly paraphyletic, forming all of the Hymenoptera except for the Apocrita, a clade deep within the sawfly tree.[10] Crustaceans are not a clade because the Hexapoda (insects) are excluded. The modern clade that spans all of them is the Tetraconata.[13][14]

Paraphyly in species[edit]

Species have a special status in systematics as being an observable feature of nature itself and as the basic unit of classification.[15] The phylogenetic species concept requires species to be monophyletic, but paraphyletic species are common in nature. Paraphyly is common in speciation, whereby a mother species (a paraspecies) gives rise to a daughter species without itself becoming extinct.[16] Research indicates as many as 20 percent of all animal species and between 20 and 50 percent of plant species are paraphyletic.[17][18] Accounting for these facts, some taxonomists argue that paraphyly is a trait of nature that should be acknowledged at higher taxonomic levels.[19][20]

Uses for paraphyletic groups[edit]

When the appearance of significant traits has led a subclade on an evolutionary path very divergent from that of a more inclusive clade, it often makes sense to study the paraphyletic group that remains without considering the larger clade. For example, the Neogene evolution of the Artiodactyla (even-toed ungulates, like deer) has taken place in an environment so different from that of the Cetacea (whales, dolphins, and porpoises) that the Artiodactyla are often studied in isolation even though the cetaceans are a descendant group. The prokaryote group is another example; it is paraphyletic because it excludes many of its descendant organisms (the eukaryotes), but it is very useful because it has a clearly defined and significant distinction (absence of a cell nucleus, a plesiomorphy) from its excluded descendants.

Also, paraphyletic groups are involved in evolutionary transitions, the development of the first tetrapods from their ancestors for example. Any name given to these ancestors to distinguish them from tetrapods—"fish", for example—necessarily picks out a paraphyletic group, because the descendant tetrapods are not included.[21]

The term "evolutionary grade" is sometimes used for paraphyletic groups.[22]

Independently evolved traits[edit]

Viviparity, the production of offspring without the laying of a fertilized egg, developed independently in the lineages that led to humans (Homo sapiens) and southern water skinks (Eulampus tympanum, a kind of lizard). Put another way, at least one of the lineages that led to these species from their last common ancestor contains nonviviparous animals, the pelycosaurs ancestral to mammals; vivipary appeared subsequently in the mammal lineage.

Independently-developed traits like these cannot be used to distinguish paraphyletic groups because paraphyly requires the excluded groups to be monophyletic. Pelycosaurs were descended from the last common ancestor of skinks and humans, so vivipary could be paraphyletic only if the pelycosaurs were part of an excluded monophyletic group. Because this group is monophyletic, it contains all descendants of the pelycosaurs; because it is excluded, it contains no viviparous animals. This does not work, because humans are among these descendants. Vivipary in a group that includes humans and skinks cannot be paraphyletic.

Not paraphyly[edit]

  • Amphibious fish are polyphyletic, not paraphyletic. Although they appear similar, several different groups of amphibious fishes such as mudskippers and lungfishes evolved independently in a process of convergent evolution in distant relatives faced with similar ecological circumstances.[23]
  • Flightless birds are polyphyletic because they independently (in parallel) lost the ability to fly.[24]
  • Animals with a dorsal fin are not paraphyletic, even though their last common ancestor may have had such a fin, because the Mesozoic ancestors of porpoises did not have such a fin, whereas pre-Mesozoic fish did have one.
  • Quadrupedal archosaurs are not a paraphyletic group. Bipedal dinosaurs like Eoraptor, ancestral to quadrupedal ones, were descendants of the last common ancestor of quadrupedal dinosaurs and other quadrupedal archosaurs like the crocodilians.

Non-exhaustive list of paraphyletic groups[edit]

The following list recapitulates a number of paraphyletic groups proposed in the literature, and provides the corresponding monophyletic taxa.

Paraphyletic taxon Excluded clades Corresponding monophyletic taxon References and notes
Prokaryotes Eukaryota Cellular organisms [25]
Protista Animalia, Plantae, and Fungi Eukaryota [26]
Invertebrates Vertebrata Animalia [27]
Sponge Eumetazoa Animalia [28] [29]
Worm Lots of Groups Nephrozoa [30][31]
Radiata Bilateria Eumetazoa [32]
Platyzoa Lophotrochozoa, Mesozoa Spiralia [33]
Fish Tetrapoda Vertebrate [34]
Reptiles Mammals, Birds Amniota [35]
Lizard Snakes, Amphisbaenia Squamates [36]
Plagiaulacidans Cimolodonta, Arginbaataridae Multituberculata [37]
Pelycosaurs Therapsida Synapsida [38]
Even-toed ungulates Cetacea Cetartiodactyla [39][40]
Archaeoceti Neoceti Cetacea [41]
Prosimians Simiiformes Primates [42]
Crustaceans Hexapoda Tetraconata [13][14]
Wasps Ants, Bees Apocrita [43]
Sawfly Apocrita Hymenoptera [10]
Vespoidea Apoidea, Ants Aculeata [44]
Parasitica Aculeata Apocrita [45]
Nautiloidea Ammonoidea, Coleoidea Cephalopoda [46]
Charophyte Embryophyte (Land plants) Streptophyta [47]
Bryophyte Tracheophyte Embryophyte [48][47]
Gymnosperm Angiosperm Spermatophyte [49]
Dicotyledon Monocotyledon Angiosperm [7]
Moth Butterfly Lepidoptera [50]
Coral Medusozoa Cnidaria [51][52]
Jellyfish Hydroidolina Medusozoa [53][54][55]
Cycloneuralia Panarthropoda Ecdysozoa [56][57]
Rotifera Acanthocephala Syndermata [58][59]

Linguistics[edit]

The concept of paraphyly has also been applied to historical linguistics, where the methods of cladistics have found some utility in comparing languages. For instance, the Formosan languages form a paraphyletic group of the Austronesian languages because they consist of the nine branches of the Austronesian family that are not Malayo-Polynesian and are restricted to the island of Taiwan.[60]

See also[edit]

Notes[edit]

  1. ^ The history of flowering plant classification can be found under History of the classification of flowering plants.

References[edit]

  1. ^ Romer, A.S. (1949): The Vertebrate Body. W.B. Saunders, Philadelphia. (2nd ed. 1955; 3rd ed. 1962; 4th ed. 1970)
  2. ^ a b c Bailly, Anatole (1981-01-01). Abrégé du dictionnaire grec français. Paris: Hachette. ISBN 2010035283. OCLC 461974285. 
  3. ^ a b c Bailly, Anatole. "Greek-french dictionary online". www.tabularium.be. Retrieved March 8, 2018. 
  4. ^ Roberts, Keith (2007-12-10). Handbook of Plant Science. ISBN 9780470057230. 
  5. ^ Sapp, Jan (June 2005). "The prokaryote–eukaryote dichotomy: meanings and mythology". Microbiology and Molecular Biology Reviews. 69 (2): 292–305. doi:10.1128/MMBR.69.2.292-305.2005. PMC 1197417Freely accessible. PMID 15944457. 
  6. ^ Stackebrabdt, E.; Tindell, B.; Ludwig, W.; Goodfellow, M. (1999). "Prokaryotic Diversity and Systematics". In Lengeler, Joseph W.; Drews, Gerhart; Schlegel, Hans Günter. Biology of the prokaryotes. Stuttgart: Georg Thieme Verlag. p. 679. 
  7. ^ a b Simpson 2006, pp. 139–140. "It is now thought that the possession of two cotyledons is an ancestral feature for the taxa of the flowering plants and not an apomorphy for any group within. The 'dicots' ... are paraphyletic ...."
  8. ^ O'Leary, Maureen A. (2001). "The phylogenetic position of cetaceans: further combined data analyses, comparisons with the stratigraphic record and a discussion of character optimization". American Zoologist. 41 (3): 487–506. CiteSeerX 10.1.1.555.8631Freely accessible. doi:10.1093/icb/41.3.487. 
  9. ^ Romer, A. S. & Parsons, T. S. (1985): The Vertebrate Body. (6th ed.) Saunders, Philadelphia.
  10. ^ a b c Sharkey, M. J. (2007). "Phylogeny and classification of Hymenoptera" (PDF). Zootaxa. 1668: 521–548. Symphyta and Apocrita have long been considered as suborders of Hymenoptera but since recognition of the paraphyletic nature of the Symphyta (Köningsmann 1977, Rasnitsyn 1988) and the advent of cladistic methods the subordinal classification should be avoided. Likewise the woodwasps are thought to be non-monophyletic, forming a grade that is ancestral relative to Apocrita and Orussidae. The traditional hymenopteran classification is faulty, by cladistic criteria,in the same way as pre-cladistic vertebrate classifications in which groups sharing plesiomorphic characterswere recognized as natural, e.g., fishes were once grouped together as 'Pisces', which excluded tetrapods. 
  11. ^ Betancur-R, Ricardo; et al. (2013). "The Tree of Life and a New Classification of Bony Fishes". PLOS Currents Tree of Life (Edition 1). doi:10.1371/currents.tol.53ba26640df0ccaee75bb165c8c26288. Archived from the original on 2013-10-13. 
  12. ^ Johnson, Brian R.; Borowiec, Marek L.; Chiu, Joanna C.; Lee, Ernest K.; Atallah, Joel; Ward, Philip S. (2013). "Phylogenomics Resolves Evolutionary Relationships among Ants, Bees, and Wasps" (PDF). Current Biology. 23 (20): 2058–2062. doi:10.1016/j.cub.2013.08.050. PMID 24094856. 
  13. ^ a b David R. Andrew (2011). "A new view of insect–crustacean relationships II. Inferences from expressed sequence tags and comparisons with neural cladistics". Arthropod Structure & Development. 40 (3): 289–302. doi:10.1016/j.asd.2011.02.001. 
  14. ^ a b Bjoern, M.; von Reumont, Ronald A.; Jenner, Matthew A.; Wills, Emiliano; Dell'Ampio, Günther; Pass, Ingo; Ebersberger, Benjamin; Meyer, Stefan; Koenemann, Thomas M. Iliffe (2012). "Pancrustacean phylogeny in the light of new phylogenomic data: support for Remipedia as the possible sister group of Hexapoda" (PDF proofs). Molecular Biology and Evolution. 29 (3): 1031–1045. doi:10.1093/molbev/msr270. PMID 22049065. 
  15. ^ Queiroz, Kevin; Donoghue, Michael J. (December 1988). "Phylogenetic Systematics and the Species Problem". Cladistics. 4 (4): 317–338. doi:10.1111/j.1096-0031.1988.tb00518.x. Retrieved 21 January 2015. 
  16. ^ James S. Albert; Roberto E. Reis (8 March 2011). Historical Biogeography of Neotropical Freshwater Fishes. University of California Press. p. 308. ISBN 9780520268685. Retrieved 28 June 2011. 
  17. ^ Ross, Howard A. (July 2014). "The incidence of species-level paraphyly in animals: A re-assessment". Molecular Phylogenetics and Evolution. 76: 10–17. doi:10.1016/j.ympev.2014.02.021. PMID 24583289. 
  18. ^ Crisp, M.D.; Chandler, G.T. (1 July 1996). "Paraphyletic species". Telopea. 6 (4): 813–844. doi:10.7751/telopea19963037. Retrieved 22 January 2015. 
  19. ^ Zander, Richard (2013). Framework for Post-Phylogenetic Systematics. St. Louis: Zetetic Publications, Amazon CreateSpace. 
  20. ^ Aubert, D. (2015). "A formal analysis of phylogenetic terminology: Towards a reconsideration of the current paradigm in systematics". Phytoneuron. 66: 1–54. 
  21. ^ Kazlev, M.A. & White, T. "Amphibians, Systematics, and Cladistics". Palaeos website. Retrieved 16 August 2012. 
  22. ^ Dawkins, Richard (2004). "Mammal-like Reptiles". The Ancestor's Tale, A Pilgrimage to the Dawn of Life. Boston: Houghton Mifflin. ISBN 0-618-00583-8. 
  23. ^ Kutschera, Ulrich; Elliott, J Malcolm (26 March 2013). "Do mudskippers and lungfishes elucidate the early evolution of four-limbed vertebrates?". Evolution: Education and Outreach. 6 (8): 8. doi:10.1186/1936-6434-6-8. 
  24. ^ Harshman, John; Braun, Edward L.; et al. (2 September 2008). "Phylogenomic evidence for multiple losses of flight in ratite birds". PNAS. 105 (36): 13462–13467. Bibcode:2008PNAS..10513462H. doi:10.1073/pnas.0803242105. PMC 2533212Freely accessible. PMID 18765814. 
  25. ^ Berg, Linda (2008). Introductory Botany: Plants, People, and the Environment (2nd ed.). Belmont CA: Thomson Corporation. p. 360. ISBN 0-03-075453-4. 
  26. ^ Protists – A textbook example for a paraphyletic taxon☆ .
  27. ^ Agassiz, Louis (21 March 2013). Essay on Classification. Courier. pp. 115–. ISBN 978-0-486-15135-9. 
  28. ^ Borchiellini, C.; Manuel, M.; Alivon, E.; Boury-Esnault, N.; Vacelet, J.; Le Parco, Y. (8 January 2001). "Sponge paraphyly and the origin of Metazoa". Journal of Evolutionary Biology. 14 (1): 171–179. doi:10.1046/j.1420-9101.2001.00244.x. 
  29. ^ Philippe, H; Derelle, R; Lopez, P.; et al. (April 2009). "Phylogenomics revives traditional views on deep animal relationships". Curr. Biol. 19 (8): 706–12. doi:10.1016/j.cub.2009.02.052. PMID 19345102. 
  30. ^ New data on Kimberella, the Vendian mollusc-like organism (White sea region, Russia): palaeoecological and evolutionary implications (2007), "Fedonkin, M.A.; Simonetta, A; Ivantsov, A.Y.", in Vickers-Rich, Patricia; Komarower, Patricia, The Rise and Fall of the Ediacaran Biota, Special publications, 286, London: Geological Society, pp. 157 – 179, doi:10.1144/SP286.12, ISBN 9781862392335, OCLC 156823511 
  31. ^ Butterfield, N.J. (December 2006). "Hooking some stem-group "worms": fossil lophotrochozoans in the Burgess Shale". BioEssays. 28 (12): 1161–6. doi:10.1002/bies.20507. PMID 17120226. 
  32. ^ Martindale, Mark; Finnerty, J.R.; Henry, J.Q. (September 2002). "The Radiata and the evolutionary origins of the bilaterian body plan". Molecular Phylogenetics and Evolution. 24 (3): 358–365. doi:10.1016/s1055-7903(02)00208-7. 
  33. ^ Gnathifera - Richard C. Brusca
  34. ^ Tree of life web project – Chordates Archived 24 February 2007 at the Wayback Machine..
  35. ^ Tudge, Colin (2000). The Variety of Life. Oxford University Press. ISBN 0198604262. 
  36. ^ Reeder, Tod W.; Townsend, Ted M.; Mulcahy, Daniel G.; Noonan, Brice P.; Wood, Perry L.; Sites, Jack W.; Wiens, John J. (2015). "Integrated Analyses Resolve Conflicts over Squamate Reptile Phylogeny and Reveal Unexpected Placements for Fossil Taxa". PLOS ONE. 10 (3): e0118199. Bibcode:2015PLoSO..1018199R. doi:10.1371/journal.pone.0118199. PMC 4372529Freely accessible. PMID 25803280. 
  37. ^ Kielan-Jaworowska, Z. & Hurum, J. (2001). "Phylogeny and Systematics of Multituberculate Animals". Palaeontology. 44 (3): 389–429. doi:10.1111/1475-4983.00185. 
  38. ^ Benton, Michael J. (2004). Vertebrate palaeontology (3rd ed.). Oxford: Blackwell Science. ISBN 978-0-632-05637-8. 
  39. ^ O'Leary, Maureen A. (2001). "The Phylogenetic Position of Cetaceans: Further Combined Data Analyses, Comparisons with the Stratigraphic Record and a Discussion of Character Optimization". American Zoologist. 41 (3): 487–506. doi:10.1093/icb/41.3.487. 
  40. ^ Savage, R. J. G. & Long, M. R. (1986). Mammal Evolution: an illustrated guide. New York: Facts on File. p. 208. ISBN 0-8160-1194-X. 
  41. ^ Thewissen, J. G. M.; Williams, E. M. (2002). "The Early Radiations of Cetacea (Mammalia): Evolutionary Pattern and Developmental Correlations". Annual Review of Ecology and Systematics. 33: 73–90. doi:10.1146/annurev.ecolsys.33.020602.095426. OCLC 4656321698. 
  42. ^ Groves, C. P. (1998). "Systematics of tarsiers and lorises". Primates. 39 (1): 13–27. doi:10.1007/BF02557740. 
  43. ^ Johnson, Brian R.; Borowiec, Marek L.; Chiu, Joanna C.; Lee, Ernest K.; Atallah, Joel; Ward, Philip S. (2013). "Phylogenomics Resolves Evolutionary Relationships among Ants, Bees, and Wasps" (PDF). Current Biology. 23 (20): 2058–2062. doi:10.1016/j.cub.2013.08.050. PMID 24094856. 
  44. ^ Johnson, B.R.; et al. (2013). "Phylogenomics Resolves Evolutionary Relationships among Ants, Bees, and Wasps". Current Biology. 23 (20): 2058–2062. doi:10.1016/j.cub.2013.08.050. PMID 24094856. 
  45. ^ Parasitic Hymenoptera (Parasitica). RL Zuparko, Encyclopedia of Entomology, 2004
  46. ^ Lindgren, A. R.; Giribet, G.; Nishiguchi, M. K. (2004). "A combined approach to the phylogeny of Cephalopoda (Mollusca)". Cladistics. 20 (5): 454–486. doi:10.1111/j.1096-0031.2004.00032.x. 
  47. ^ a b Becker, B.; Marin, B. (2009). "Streptophyte algae and the origin of embryophytes". Annals of Botany. 103 (7): 999–1004. doi:10.1093/aob/mcp044. PMC 2707909Freely accessible. PMID 19273476. 
  48. ^ Cox, Cymon J.; Li, Blaise; Foster, Peter G.; Embley, T. Martin & Civáň, Peter (2014). "Conflicting Phylogenies for Early Land Plants are Caused by Composition Biases among Synonymous Substitutions". Systematic Biology. 63 (2): 272–279. doi:10.1093/sysbio/syt109. PMC 3926305Freely accessible. PMID 24399481. 
  49. ^ Christenhusz, M.J.M.; Reveal, J.L.; Farjon, A.; Gardner, M.F.; Mill, R.R.; Chase, M.W. (2011). "A new classification and linear sequence of extant gymnosperms" (PDF). Phytotaxa. 19: 55–70. 
  50. ^ Scoble, MJ 1995. The Lepidoptera: form, function and diversity. Oxford, UK: The Oxford University Press; 404 p.
  51. ^ Stampar, S.N.; Maronna, M.M.; Kitahara, M.V.; Reimer, J.D.; Morandini, A.C. (2014). "Fast-Evolving Mitochondrial DNA in Ceriantharia: A Reflection of Hexacorallia Paraphyly?". PLoS ONE. 9 (1): e86612. Bibcode:2014PLoSO...986612S. doi:10.1371/journal.pone.0086612. PMC 3903554Freely accessible. PMID 24475157. 
  52. ^ Ruppert, Edward E.; Fox, Richard, S.; Barnes, Robert D. (2004). Invertebrate Zoology, 7th edition. Cengage Learning. pp. 132–48. ISBN 978-81-315-0104-7. 
  53. ^ Zou, H.; Zhang, J.; Li, W.; Wu, S.; Wang, G. (2012). "Mitochondrial Genome of the Freshwater Jellyfish Craspedacusta sowerbyi and Phylogenetics of Medusozoa". PLoS ONE. 7 (12): e51465. Bibcode:2012PLoSO...751465Z. doi:10.1371/journal.pone.0051465. PMC 3519871Freely accessible. PMID 23240028. 
  54. ^ Marques, Antonio C.; Allen G. Collins (March 2004). "Cladistic analysis of Medusozoa and cnidarian evolution". Invertebrate Biology. 123 (1). pp. 23–42. doi:10.1111/j.1744-7410.2004.tb00139.x. 
  55. ^ Zapata et al. 2015. Phylogenomic analyses support traditional relationships within Cnidaria. PLOS ONE. http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0139068 open access publication – free to read
  56. ^ Dunn, et al., 2008; Dunn, CW; Hejnol, A; Matus, DQ; Pang, K; Browne, WE; Smith, SA; Seaver, E; Rouse, GW; et al. (2008). "Broad phylogenomic sampling improves resolution of the animal tree of life". Nature 452 (7188): 745–749.
  57. ^ Webster, Bonnie L.; Copley, Richard R.; Jenner, Ronald A.; Mackenzie-Dodds, Jacqueline A.; Bourlat, Sarah J.; Rota-Stabelli, Omar; Littlewood, D. T. J.; Telford, Maximilian J. (November 2006). "Mitogenomics and phylogenomics reveal priapulid worms as extant models of the ancestral Ecdysozoan". Evolution & Development. 8 (6): 502–510. doi:10.1111/j.1525-142X.2006.00123.x. 
  58. ^ Ruppert, Edward E.; Fox, Richard S, & Barnes, Robert D. (2004), Invertebrate zoology : a functional evolutionary approach (7th ed.), Belmont, CA: Thomson-Brooks/Cole, ISBN 978-0-03-025982-1 , p. 788ff. – see particularly p. 804
  59. ^ Shimek, Ronald (January 2006). "Nano-Animals, Part I: Rotifers". Reefkeeping.com. Retrieved 2008-07-27. 
  60. ^ Greenhill, Simon J. and Russell D. Gray. (2009.) "Austronesian Language and Phylogenies: Myths and Misconceptions About Bayesian Computational Methods," in Austronesian Historical Linguistics and Culture History: a Festschrift for Robert Blust, edited by Alexander Adelaar and Andrew Pawley. Canberra: Pacific Linguistics, Research School of Pacific and Asian Studies, The Australian National University.

Bibliography[edit]

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