Results for “derived”

derived

Used in phylogenetics in reference to a character or character state not present in the ancestral form of a species; apomorphic.

Used in 190 profiles

derived trait

In phylogenetics, a trait present in an organism which was absent in the last common ancestor of the group being considered; an apomorphy. Also used to refer to traits present in the ancestral form that have subsequently been lost.

apomorphy

A derived character state of a clade; a feature novel to a species and its descendants.

Used in 2 profiles

asexual reproduction

Mode of reproduction which does not involve fertilisation whereby offspring derive from a single parent and inherit genes only from that parent. Known in the Amazon Molly, Poecilia formosa, and some other fish species.

basal

At, towards or constituting a base; primitive. Opposite of derived. In cladistics, used to in reference to a clade within which other clades are nested.

Used in 92 profiles

biotic

Consisiting of, associated with or derived from living organisms. Biotic factors in an environment include the organisms themselves plus predation, competition and other interrelationships.

character

In ichthyology, any characteristic or its attributes used for recognising, describing, defining, or differentiating species, genera or higher taxa. Also used in phylogenetic analyses whereby ancestral (primitive) characters are termed plesiomorphic and derived (novel) characters apomorphic.

Used in 843 profiles

cladistics

Taxonomical method used to classify species of organisms into clades, each of which contains an ancestor organism and all its descendants, based on synapomorphies (shared derived characters). Cladistic classifications are usually presented in the form of a cladogram.

coral sand

Sand originating from marine environments via bioerosion of the calcareous skeletal structures possessed by some organisms. Coral is not the chief constituent, however, with the majority of material deriving from foraminifera, calcareous algae, molluscs, and crustaceans.

Used in 6 profiles

empirical

Derived from or relating to experimental observation as opposed to theory.

Used in 1 profile

ichthyotoxin

Any toxic substance derived from fishes.

Used in 1 profile

igarapé

Minor tributary stream or small river in the Amazon region, the name deriving from the native nheengatu language. It literally translates as 'canoe path' since most igarapés are navigable by canoe or small boat and they are traditionally important as a means of transport and communication.

Used in 22 profiles

mutualism

Symbiosis from which both organisms involved derive some benefit.

organic

Of, relating to, or derived from living organisms.

Used in 583 profiles

parasite

Organism that lives on or in a second, host organism of a different species, with the latter deriving no benefit or being directly harmed by the relationship.

Used in 133 profiles

patronym

In zoological nomenclature, a taxonomic name derived from the name of a person.

Used in 2 profiles

patronymic

Of or derived from a personal or family name.

plesiomorphy

In cladistics, a character or trait shared by two or more taxonomic groups but derived from a remote or much earlier common ancestral form and therefore cannot be used to define a clade. Also known as an ancestral state and generally appears at the base level of a cladogram.

Used in 2 profiles