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[1] In phylogenetics , an autapomorphy is a distinctive feature, known as a derived trait, that is unique to a given taxon. That is, it is found only in one taxon , but not found in any others or outgroup taxa , not even those most closely related to the focal taxon (which may be a species , family or in general any clade). [ 2 ]
In his 1985 monograph on the Mygalomorphae, Robert Raven considered the divided tarsal scopulae to be a plesiomorphic character and the Ischnocolinae to be non-monophyletic, treating it as Theraphosidae incertae sedis. His key to the subfamilies of the Theraphosidae split genera that had been placed in the subfamily among three informal groups. [5]
In biological phylogenetics, a clade (from Ancient Greek κλάδος (kládos) 'branch'), also known as a monophyletic group or natural group, [1] is a grouping of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. [2]
The term monophyly, or monophyletic, derives from the two Ancient Greek words μόνος (mónos), meaning "alone, only, unique", and φῦλον (phûlon), meaning "genus, species", [4] [5] and refers to the fact that a monophyletic group includes organisms (e.g., genera, species) consisting of all the descendants of a unique common ancestor.
However, this classification system is in disuse due to the kingdom's non-monophyletic nature. [25] While Ochrophyta is the preferred name by general protistologists and protozoologists, the name Heterokontophyta is considered more familiar among phycologists. [7]
Miami Dolphins wide receiver Jaylen Waddle suffered a knee injury in the second quarter against the Houston Texans in Week 15.. The star receiver exited the game and entered the blue medical tent ...
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.
No app can fix your focus. Here’s how CNN’s Upasna Gautam ditched the productivity hacks and embraced the basics to get the most out of life.