Knowra Arachnid phylogeny Arachnid phylogeny Arachnid phylogeny reconstructs evolutionary relationships among arachnid orders and their placement within Chelicerata using anatomical, developmental, fossil, and molecular evidence.
Arachnida : Arachnida is the chelicerate class containing spiders, scorpions, mites, and related groups. The relationships under study concern the orders assigned to this class.
Morphological phylogenetics : Morphological phylogenetics infers evolutionary relationships from coded anatomical or developmental characters. Body structures and development supply characters for comparing arachnid lineages.
Arachnopulmonata : Arachnopulmonata is a proposed clade uniting spiders, scorpions, and related arachnids that share respiratory and genomic features. Its support illustrates how evidence can unite otherwise distinct arachnid orders.
Arachnid monophyly : Arachnid monophyly is the hypothesis that all arachnids descend from one exclusive common ancestor. The hypothesis is central to determining whether Arachnida forms a natural evolutionary group.
Chelicerata : Chelicerata is an arthropod subphylum that includes arachnids, horseshoe crabs, and sea spiders. Arachnids must be placed among these broader chelicerate lineages.
Phylogenomic analysis : Phylogenomic analysis estimates evolutionary relationships using large collections of genes or genomic data. Large molecular datasets have reshaped proposed relationships among arachnid orders.
Acari : Acari is the arachnid group comprising mites and ticks, with a highly diverse and disputed internal classification. Its placement and internal branching challenge reconstructions of arachnid evolution.
Acari phylogeny : Acari phylogeny investigates evolutionary relationships among mites and ticks and their placement among arachnids. Molecular and morphological studies continue to disagree over major mite lineages.
Arachnid orders : Arachnid orders are the major taxonomic groups within Arachnida, including Araneae, Scorpiones, and Acari. Phylogenetic hypotheses compare these principal lineages.
Molecular clock : A molecular clock estimates the timing of evolutionary divergences from genetic change and calibration points. Divergence-time estimates place arachnid splits against the fossil record.
Show all 21