Arthropod appendages

Arthropod appendages are paired, jointed structures attached to body segments. They include limbs and specialized structures for sensing, feeding, movement, and reproduction.

Arthropod: An invertebrate animal with a segmented body, jointed appendages, and a chitinous exoskeleton. Appendages are defining structures across this diverse animal group.
Arthropod limb: A segmented arthropod appendage used chiefly for locomotion or manipulation. Limb segments and their joints show how appendages produce movement.
Antenna (biology): A paired sensory appendage on the head of many arthropods, especially insects and crustaceans. Antennal appendages specialize in detecting chemical, tactile, and other signals.
Arthropod limb homology: The study of structural and evolutionary correspondences among appendages in different arthropod groups. Homology helps distinguish shared ancestry from similar adaptations.
Onychophora: A phylum of soft-bodied invertebrates, commonly called velvet worms, with unjointed lobopod legs. Velvet-worm limbs contrast with the articulated appendages characteristic of arthropods.
Arthropod segmentation: The division of an arthropod body into segments, often organized into functional regions called tagmata. Appendages attach to segments whose fusion and specialization shape their arrangement.
Apodeme: An inward projection of an arthropod's cuticle that provides an attachment site for muscles. Muscles pull on internal cuticular projections to move appendage segments.
Arthropod mouthparts: Appendages around an arthropod's mouth modified for obtaining and processing food. Mouthparts show how appendages can be repurposed for distinct feeding methods.
Arthropod limb evolution: The evolutionary diversification of arthropod appendages from ancestral forms into structures with varied shapes and functions. Changes in appendages document a major route of arthropod diversification.
Tardigrade: A microscopic animal with a compact body and typically four pairs of short, clawed or sucker-bearing legs. Tardigrade legs provide a compact comparison with arthropod appendage construction.

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