comparative anatomy
Cross-species structural study
Comparative anatomy is the branch of biology that studies the similarities and differences in the bodily structures of different species.
By examining how organs, bones, and tissues vary across animals, scientists can trace evolutionary relationships and understand how species adapted to their environments over time.
The field provides key evidence for evolution: homologous structures like the forelimbs of whales, bats, and humans reveal common ancestry despite vastly different functions.
Repeated anatomical units along body
- forelimbAnterior vertebrate appendage
- parallelismMatching structural elements
- osteologyScientific study of bones
- recapitulationSummarizing what came before
Related through past generations
- natural selectionDifferential reproductive success
- fossil recordRemains documenting prehistoric life
- divergenceSeparation from common origin
- convergent evolutionIndependent origin of similar features
vestigial structures · Darwin · speciation · evolutionary biology · paleontology · extinction · common ancestor · tetrapod
Hair-bearing, milk-producing animals
- reptilesCold-blooded scaly vertebrates
- amphibiansVertebrates with aquatic larvae
- birdsEgg-laying flying vertebrates
- fishGilled aquatic vertebrate
primates · carnivores · tetrapods · amniotes · chordates · cranium · vertebral column · heart chambers
Classification by common descent
- systematicsScience of classifying organisms
- taxonomyScience of categorical arrangement
- phylogeneticsScience of ancestral relationships
- lineageDescent from progenitors
clade · outgroup · ingroup · biogeography · mitochondrial DNA · evolutionary tree · branching pattern
Shape or document
- symmetryInvariance under transformation
- body planOrganism's fundamental structural arrangement
- skeletal systemBody's bone structure
- musculatureArrangement of muscles
organ systems · dissection · cross-section · proportion · bilateral symmetry · radial symmetry · segmentation · appendages
Jointed-limb invertebrates
- mollusksSoft-bodied invertebrates, often shelled
- annelidsRinged-body worm phylum
- echinodermsSpiny-skinned marine invertebrates
- nematodesCylindrical unsegmented worms
exoskeleton · segmentation · body cavity · nervous system · circulatory system · compound eyes · radula · mantle
serial homology
Repeated anatomical units along body
- forelimbAnterior vertebrate appendage
- parallelismMatching structural elements
- osteologyScientific study of bones
recapitulation · ontogeny · Haeckel · Owen
common ancestry
Related through past generations
- natural selectionDifferential reproductive success
- fossil recordRemains documenting prehistoric life
- divergenceSeparation from common origin
convergent evolution · vestigial structures · Darwin · speciation · evolutionary biology · paleontology · extinction · common ancestor · tetrapod · Archaeopteryx
mammals
Hair-bearing, milk-producing animals
- reptilesCold-blooded scaly vertebrates
- amphibiansVertebrates with aquatic larvae
- birdsEgg-laying flying vertebrates
fish · primates · carnivores · tetrapods · amniotes · chordates · cranium · vertebral column · heart chambers · endoskeleton
cladistics
Classification by common descent
- systematicsScience of classifying organisms
- taxonomyScience of categorical arrangement
- phylogeneticsScience of ancestral relationships
lineage · clade · outgroup · ingroup · biogeography · mitochondrial DNA · evolutionary tree · branching pattern
form
Shape or document
- symmetryInvariance under transformation
- body planOrganism's fundamental structural arrangement
- skeletal systemBody's bone structure
musculature · organ systems · dissection · cross-section · proportion · bilateral symmetry · radial symmetry · segmentation · appendages · vertebral column
arthropods
Jointed-limb invertebrates
- mollusksSoft-bodied invertebrates, often shelled
- annelidsRinged-body worm phylum
- echinodermsSpiny-skinned marine invertebrates
nematodes · exoskeleton · segmentation · body cavity · nervous system · circulatory system · compound eyes · radula · mantle · tube feet
comparative anatomyphysiology
Science of bodily functions
ethology · animal behavior · ecology · biomechanics · evolutionary psychology
comparative anatomymolecular biology
Study of cellular machinery
histology · cell biology · biochemistry · cytology · ultrastructure
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