Apomorphy

In phylogenetics, an apomorphy (or derived trait) is a novel character or character state that has evolved from its ancestral form (or plesiomorphy)....

trackways. Defining tetrapods based on one or two apomorphies can present a problem if these apomorphies were acquired by more than one lineage through convergent...

distinguish the clade from other clades. Plesiomorphy, symplesiomorphy, apomorphy, and synapomorphy, all mean a trait shared between species because they...

species, family or in general any clade). It can therefore be considered an apomorphy in relation to a single taxon. The word autapomorphy, introduced in 1950...

some other descendant of that first rodent, perhaps the red squirrel. An apomorphy-based definition could read: "the first ancestor of A to possess trait...

amnion, hence the name. A problem with this definition is that the trait (apomorphy) in question does not fossilize, and the status of fossil forms has to...

("lower") and vascular ("higher") plants). The terms "plesiomorphy" and "apomorphy" are typically used in the technical literature: for example, when a plesiomorphic...

defining clades are featured in phylogenetic nomenclature: node-, stem-, and apomorphy-based (see Phylogenetic nomenclature§Phylogenetic definitions of clade...

significantly reduced form. Averostra was named by Gregory S. Paul in 2002 as an apomorphy-based clade defined as the group including the Dromaeosauridae and other...

magazine on urbanism Dérive, a psychogeographical concept Derived trait, or apomorphy All pages with titles containing Derive Derivation (disambiguation) Derivative...

which have been passed down from innovations in a shared ancestor (apomorphies). Only derived characters, such as the spine-producing areoles of cacti...

eudicots, rather than non-monocot flowering plants in general. Monocot apomorphies (characteristics derived during radiation rather than inherited from...

defined as an apomorphy-based taxon based on the presence of a "crocodile-normal" ankle joint (considered to be the defining apomorphy of the clade)....

Apomorphy in cladistics. This diagram indicates "A" and "C" as ancestral states, and "B", "D" and "E" as states that are present in terminal taxa. Note...

Lesser striped swallow (Cecropis abyssinica), showing some apomorphies of its ancient yet highly advanced lineage....

birds than to Deinonychus. Avialae is also occasionally defined as an apomorphy-based clade (that is, one based on physical characteristics). Jacques...

the group based on the characteristics of the hand and wrist alone (an apomorphy-based definition), and included the long, thin fingers, bowed, wing-like...

classifications in that he considered a modified fifth metatarsal to be an apomorphy of the group, leading him to place Sauropterygia, Mesosauria and possibly...

turtles, snakes and crocodiles form a clade that excludes the birds. An apomorphy ("separate form") or derived state is an innovation. It can thus be used...

other clades; shared apomorphies are used to construct and define clades. The term is relative; a trait considered an apomorphy in one clade may not be...