Phylum Arthropoda Vocabulary by Azryel Allison

Arthropoda

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A phylum of invertebrate animals characterized by having jointed appendages and a segmented body with an exoskeleton made of chitin.

Appendages

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Structures attached to the body, such as legs, antennae, or mouthparts, used for various functions like locomotion, sensing, or feeding.

Thorax

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The middle section of the body in insects and other arthropods, to which legs and wings are typically attached.

Abdomen

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The hindmost section of the body in insects and other arthropods, often containing vital organs such as the digestive and reproductive systems.

Body Cavity

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A fluid-filled space within the body of some animals, including arthropods, where organs are suspended.

Nervous System

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The system in animals responsible for transmitting and processing sensory information and coordinating body functions, including the brain, spinal cord, and nerves.

Exoskeleton

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A rigid external covering made of chitin that provides support and protection for the body of arthropods.

Chitin

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A tough, fibrous substance that makes up the exoskeleton of arthropods and the cell walls of fungi.

Molting

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The process of shedding the exoskeleton to allow for growth in arthropods and other invertebrates.

Antennae

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Sensory appendages on the head of arthropods, often used for detecting chemicals, touch, and movement.

Compound Eyes

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Eyes made up of many individual visual units called ommatidia, allowing for a wide field of view and motion detection.

Simple Eyes

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Single-lens eyes found in some arthropods, typically used for detecting light and dark.

Spiracles

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External openings in the exoskeleton of insects and some other arthropods used for breathing.

Complete Metamorphosis

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A type of insect development characterized by distinct larval, pupal, and adult stages, with significant differences in morphology and behavior between each stage.

Incomplete Metamorphosis

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A type of insect development characterized by nymphs resembling adults but lacking wings and reproductive organs, with gradual development through multiple molts.

Pedipalps

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Appendages near the mouth of certain arthropods used for feeding, sensing, or reproduction.

Opisthosoma

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The posterior part of the body in some arthropods, such as spiders and scorpions, often containing the abdomen and other structures.

Nymph

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A juvenile form of certain insects that resembles the adult but lacks wings and reproductive organs.

Larva

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The immature stage of insects that undergo complete metamorphosis, often with different feeding habits and appearance than the adult.

Pupa (Chrysalis)

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The stage between the larval and adult stages in insects that undergo complete metamorphosis, characterized by dramatic internal restructuring.

Book Lungs

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Respiratory organs found in some arachnids, consisting of parallel folds resembling the pages of a book.

Paralyze

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To immobilize or render unable to move, often through the action of venom or toxins.

Mandibles

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Strong, tooth-like structures near the mouth of arthropods used for biting, chewing, and manipulating food.

Swimmerets

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Small paired appendages found on the abdomens of certain aquatic arthropods, such as crayfish and shrimp, used for swimming and reproduction.

Maggot Therapy

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The medical use of fly larvae (maggots) to clean infected wounds by consuming dead tissue.

Insects

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A class of invertebrate animals within the arthropod phylum, characterized by three pairs of legs, a segmented body, and typically one or two pairs of wings.

Arachnids

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A class of arthropods, including spiders, scorpions, and ticks, characterized by four pairs of legs, a cephalothorax, and typically no antennae.

Centipedes

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Arthropods belonging to the class Chilopoda, characterized by long, segmented bodies with one pair of legs per segment.

Millipedes

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Arthropods belonging to the class Diplopoda, characterized by cylindrical bodies with two pairs of legs per segment.

Crustaceans

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A diverse group of arthropods, including crabs, lobsters, shrimp, and barnacles, typically with two pairs of antennae and a hard exoskeleton.

Ecdysis

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The process of molting or shedding the exoskeleton in arthropods and other invertebrates.

Pedipalps

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The second pair of appendages near the mouth in certain arachnids, used for sensing, feeding, or reproduction.

Chelicerae

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The first pair of appendages near the mouth in arachnids, typically modified into fangs or pincers used for feeding or defense.

Sensilla

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Small sensory organs found on the exoskeleton of arthropods, used for detecting various stimuli such as touch, chemicals, and vibrations.