What is a shared derived character called

A shared derived character is a characteristic or trait that two lineages share, which has evolved leading up to their clade.

A derived character is a trait that arose in the most recent common ancestor of a particular lineage and was passed along to its descendants.

Definition of apomorphy

biological taxonomy. : a specialized trait or character that is unique to a group or species : a character state (such as the presence of feathers) not present in an ancestral form In this case, white flowers are a derived condition, an apomorphy, and red flowers are the ancestral condition.—

A character which is in a new state and shared by all the member of the group. Unique Derived Character = Autapomorphy. A character found only in that taxon. Is a synapomorphy when discussed at the level of the members of a taxon.

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).

Apomorphy describes a situation where a characteristic is present in all members of the clade hence it is unique to that particular clade. In contrast, plesiomorphy is a situation where a characteristic is present in the clade, but not among all members.

plesiomorphy (ancestral trait) An evolutionary trait that is homologous within a particular group of organisms but is not unique to members of that group (compare apomorphy) and therefore cannot be used as a diagnostic or defining character for the group.

Lizards, trutles, and crocodiles are ectothermic (coldblooded), while birds are endothermic (warmblooded). Being coldblooded is symplesiomorphic for lizards, turtles, and crocodiles, but they do not form a clade, as crocodiles are more related to birds than to lizards and turtles.

A derived state shared by two or more lineages, which was present in their common ancestor, and is not found in other organisms. Synapomorphies diagnose monophyletic groups. Symplesiomorphy = shared, ancestral character.

Main Difference – Apomorphy vs Plesiomorphy

The main difference between apomorphy and plesiomorphy is that apomorphy refers to any character unique to a particular clade and its descendants whereas plesiomorphy refers to any character homologous within the clade but, not unique to all members.

An example of an apomorphy or synapomorphy is the presence of derived traits such as an erect gait, fur, and mammary glands in mammals but not in other vertebrate animals like amphibians and reptiles, which have retained their ancestral traits of a sprawling gait and a lack of fur.

Symplesiomorphy is a characteristic property that is developed and presented by different groups of organisms resulting due to the presence of a common ancestry between the groups. Human and gorilla skeleton, forearm bones human, bat and cat are examples for synapomorphy.

Synapomorphy vs Plesiomorphy

In contrast to a synapomorphy, a plesiomorphy is a shared character, shared by two groups who inherited it from different ancestors. … A synapomorphy says more about the relatedness of two species, because it indicates that the two organisms shared a common ancestor.

Convergent evolution creates analogous structures that have similar form or function but were not present in the last common ancestor of those groups.

an evolutionary trait that is homologous within groups of organisms (see homology) that are all descended from a common ancestor in which the trait first evolved.

plesiomorphy. in cladistics, another term for an ancestral character state. symplesimorphy. in cladistics, another term for a shared ancestral/primitive or outgroup character state.

Etymology. The term polyphyly, or polyphyletic, derives from the two ancient greek words πολύς (polús), meaning “many, a lot of”, and φῦλον (phûlon), meaning “genus, species”, and refers to the fact that a polyphyletic group includes organisms (e.g., genera, species) arising from multiple ancestral sources.

Monophyletic group includes all descendants of the ancestor. Paraphyletic group does not include all the descendants of the ancestor. Polyphyletic group does not include all the descendants of the ancestor. Monophyletic group has a common ancestor.