In phylogenetics, a primitive (or ancestral) character, trait, or feature of a lineage or taxon is one that is inherited from the common ancestor of a...

In phylogenetics, basal is the direction of the base (or root) of a rooted phylogenetic tree or cladogram. The term may be more strictly applied only to...

Primitive root of unity; See Root of unity Primitive triangle, an integer triangle whose sides have no common prime factor Primitive (phylogenetics)...

Phylogenetic signal is an evolutionary and ecological term, that describes the tendency or the pattern of related biological species to resemble each other...

image: humerus brown, radius pale buff, ulna red. Analogy (biology) Primitive (phylogenetics) Panchen, A. L. (1999). "Homology — History of a Concept". Novartis...

feathers. The genus Microraptor is both older geologically and more primitive phylogenetically than Deinonychus, and within the same family. Multiple fossils...

terrestrial arthropods, including insects representing basal (primitive) phylogenetic clades, the male deposits spermatozoa on the substrate, sometimes...

subgroup of the superorder Ostariophysi. They are characterized by a primitive Weberian apparatus formed by the first three vertebrae and one or more...

Marvaldi et al. in 2002, and was achieved using phylogenetic analyses. The accepted families were the primitive weevils, Anthribidae, Attelabidae, Belidae...

Plesiomorphy, an ancestral trait (character state) of an organism Primitive (phylogenetics), a term for ancestral traits; the complement of "derived". Grimaldi...

of phylogenetic inference. He is also remembered for Hennig's progression rule in cladistics, which argues controversially that the most primitive species...

Diplomystidae, the velvet catfishes, are a family of primitive catfishes endemic to freshwater habitats in Argentina and Chile in southern South America...

from the last common ancestor of all animals, with fossil evidence of primitive sponges such as Otavia from as early as the Tonian period (around 800 Mya)...

Pelycosaur (/ˈpɛlɪkəˌsɔːr/ PEL-ih-kə-sor) is an older term for basal or primitive Late Paleozoic synapsids, excluding the therapsids and their descendants...

Polypompholyx's sections Polypompholyx, Tridentaria, and Pleiochasia are the most primitive due to their tricolporate pollen type. List of Utricularia species Utricularia...

also known from dinosaurs that are very primitive members of the bird lineage, or Avialae. The most primitive example is Epidexipteryx, which had a short...

characterizes the therizinosaurs, dromaeosaurids, avialans, and some primitive troodontids. The fact that the backward-pointing hip is present in so...

Prokaryota. However, in the three-domain system, based upon molecular phylogenetics, prokaryotes are divided into two domains: Bacteria and Archaea. A third...

various families of spiders commonly called trapdoor spiders. Like the "primitive" suborder of spiders Mesothelae, they have two pairs of book lungs, and...

Zhu, Min; Yu, Xiaobo; Wang, Wei; Zhao, Wenjin; Jia, Liantao (2006). "A primitive fish provides key characters bearing on deep osteichthyan phylogeny"....

Marattiaceae; and the leptosporangiate ferns. The Marattiaceae are a primitive group of tropical ferns with large, fleshy rhizomes and are now thought...

the order Anura containing various primitive frogs and toads. As the name suggests, these are the most primitive frogs. Many of the species (28 in total)...

the Permian period, over 250 million years ago, based on their primitive phylogenetic position. In 2015, Rainer R. Schoch reported a new small (~ 20 cm...

numerical analysis of the phylogenetics of Ornithischia was published in 2008 by Richard J. Butler and colleagues, including many primitive ornithischians and...

Halgedahl, Susan L.; Selden, Paul; Jarrard, Richard D. (2015). "Rare primitive deuterostomes from the Cambrian (Series 3) of Utah" (PDF). Journal of...

this formation, any of which may have been the prey of Vasuki. Other primitive whales that weren't unearthed in the Naredi Formation but lived in the...

are considered to be among the most primitive of the arthrodires, and are widely accepted to be phylogenetically basal to the group. The bodies of Actinolepids...

mammals, (previously known as pelycosaurs), comprising the other six more primitive families of synapsids. Stem mammals were all rather lizard-like, with...

Cotylosauria, a group that comprised what was believed to be the most primitive of reptiles. Cotylosauria has since been renamed Captorhinida, which is...

 xiv. Nakhleh, Luay; Ringe, Don; Warnow, Tandy (June 2005). "Perfect Phylogenetic Networks: A New Methodology for Reconstructing the Evolutionary History...