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polytomy
polytomy (pəˈlɪtəmɪ) [f. Gr. πολυ-, poly- + -τοµια, f. -τοµος cut. Cf. F. polytomie.] The condition or character of being polytomous. (Distinguished from dichotomy and trichotomy.) 1. Bot. Division into several (more than two) branches at the same point.1875 Bennett & Dyer Sachs' Bot. 148 Dichotomy ...
Oxford English Dictionary
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Polytomy
In contrast, a hard polytomy represents a true divergence event of three or more lineages. Applications
Interpretations for a polytomy depend on the individuals, that are represented in the phylogenetic tree.
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polychotomous
polychotomous, a. (pɒlɪˈkɒtəməs) [Erroneously formed by substituting poly- for di- in dicho-tomous, dichotomous.] Divided, or involving division, into many (or more than two) parts, sections, groups, or branches: = polytomous. So polyˈchotomy, division into more than two parts or groups, as in class...
Oxford English Dictionary
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Polychotomy
In evolutionary biology, the term polychotomy can also be considered a historically-based misspelling of polytomy.
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polytomous
polytomous, a. (pəˈlɪtəməs) [f. Gr. type *πολύτοµ-ος (f. πολυ- much + -τοµος cut) + -ous.] Divided, or involving division, into many parts. 1. Bot. a. spec. Applied to a leaf having several divisions, but not articulated with the midrib so as to form leaflets (e.g., a pinnatifid or pinnatipartite le...
Oxford English Dictionary
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Khulsanurus
Classification
Averianov & Lopatin (2021) placed Khulsanurus in a polytomy with Albinykus, Ceratonykus, Linhenykus, Parvicursor, Xixianykus, Qiupanykus However, Averianov & Lopatin (2021) also recovered it in a polytomy with only Albinykus, Xixianykus, PIN 5838/1 (=Ondogurvel), Mononykus and Shuvuuia in
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Aletopelta
Arbour & Currie (2015) additionally recovered Aletopelta within a polytomy containing Liaoningosaurus, Cedarpelta, Chuanqilong and more derived ankylosaurids Park et al. (2019) also placed Aletopelta within a polytomy but with the inclusion of Jinyunpelta, Nodosaurus and Kunbarrasaurus.
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Neoaves
The disagreement on topology even with large phylogenomic studies led Suh (2016) to propose a hard polytomy of nine clades as the base of Neoaves. An analysis by Houde et al. (2019) recovered Columbea and a reduced hard polytomy of six clades within Passerea.
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Dolichosaurus
Sister-group relationships between coniasaurs, dolichosaurs, Aigialosauridae and Mosasauridae are an unresolved polytomy.
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Piscivoravis
Phylogenetic analysis places Piscivoravis in a more derived position than Archaeorhynchus, in a polytomy with Jianchangornis, Patagopteryx, and the clade
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Namazonurus
"Between a rock and a hard polytomy: Rapid radiation in the rupicolous girdled lizards (Squamata: Cordylidae)".
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Hemicordylus capensis
References
Hemicordylus resurrected: Stanley et al, 2011, Between a rock and a hard polytomy: Rapid radiation in the rupicolous girdled lizards (Squamata
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Strabopidae
A 2013 attempt to place them in a phylogenetic analysis recovered them as part of a polytomy with megacheirans, marrellomorphs, crustaceans and artiopodans
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Hemicordylus nebulosus
References
Sources
Hemicordylus resurrected: Stanley et al., 2011, Between a rock and a hard polytomy: Rapid radiation in the rupicolous girdled lizards
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Asperoris
Nesbitt, Butler and Gower's 2013 phylogenetic analysis resulted in a strict consensus tree with Asperoris in a polytomy or unresolved phylogenetic relationship The five-genus polytomy is resolved into a clearer system of clades when Asperoris is omitted, as the taxon's lack of postcranial features reduced the
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