basal group
the earliest diverging group within a clade

Dictionary of ichthyology. 2009.

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  • Basal (phylogenetics) — In phylogenetics, a basal clade is the earliest clade to branch in a larger clade; it appears at the base of a cladogram. A basal group form an outgroup to the rest of the clade.The word basal is preferred to the loaded term primitive , which has …   Wikipedia

  • Basal ganglia — Infobox Brain Name = Basal ganglia Latin = nuclei basales GraySubject = GrayPage = Caption = Basal ganglia labeled at top right. Caption2 = IsPartOf = Components = Artery = Vein = BrainInfoType = hier BrainInfoNumber = 206 MeshName =… …   Wikipedia

  • Basal angiosperms — Nymphaea alba, from the Nymphaeales The basal angiosperms are the first flowering plants to diverge from the ancestral angiosperm. In particular, the most basal angiosperms are the so called ANITA grade which is made up of Amborella (a single… …   Wikipedia

  • Basal forebrain — Infobox Brain Name = PAGENAME Latin = GraySubject = GrayPage = Caption = The Basal Forebrain Width = 200 IsPartOf = Components = Artery = Vein = MeshNumber = The basal forebrain is a collection of structures located ventrally to the striatum. It… …   Wikipedia

  • basal — 1. adjective a) Relating to, or forming, the base, or point of origin. Hittite is a basal Indo European language. b) In a phylogenetic tree, being a group, or member of a group, which diverged earlier. A magnolia is a basal angiosperm. 2 …   Wiktionary

  • Basal optic nucleus of Meynert — Infobox Brain Name = PAGENAME Latin = n. basalis telencephali GraySubject = GrayPage = Caption = Caption2 = IsPartOf = Components = Artery = Vein = Acronym = BrainInfoType = hier BrainInfoNumber = 257 MeshName = Basal+nucleus+of+Meynert… …   Wikipedia

  • Basal-like carcinoma — The basal like carcinoma is a newly proposed subtype of breast cancer defined by its gene expression and protein expression profile [Phenotypic evaluation of the basal like subtype of invasive breast carcinoma, Modern Pathology 19:264 271 (2006) …   Wikipedia

  • basal ganglion — noun Any of a group of nuclei in the brain interconnected with the cerebral cortex, thalamus and brainstem …   Wiktionary

  • basal ganglia — plural noun Anatomy a group of structures linked to the thalamus in the base of the brain and involved in coordination of movement …   English new terms dictionary

  • Primate basal ganglia system — The primate basal ganglia system is a symmetrical major cerebral system that has only recently been recognized. In the past, part of it was presented as motor or extrapyramidal , complementary to the corticospinal (pyramidal) system. Contrary to… …   Wikipedia

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