Questions and Answers
All arthropods have a distinctive, lightweight _____ which is composed of chitin and proteins and provides protection while allowing efficient locomotion.
exoskeleton
What is considered to be the most species-rich and diverse phylum in the animal kingdom?
Phylum Arthropoda
Arthropods are _____ belonging to clade Panarthropoda.
ecdysozoan protostomes
Scientists can classify arthropods into different _____ by comparing the similarities and differences in morphological features among subgroups.
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A spider possesses which type of mouthpart as depicted in the figure?
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The arthropod exoskeleton confers which of the following selective advantages? (Select all that apply)
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True or false: Arthropods are members of perhaps the most species-rich and diverse phylum in the animal kingdom.
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Arthropods are ecdysozoan protostomes belonging to clade _____
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Arthropods can be classified into subgroups based on morphological features of body plans and are divided into _____ based on relationships among these subgroups.
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Select all of the following that are arthropods.
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Identify the type of mouthpart represented by arrows in the following figure.
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The shedding of the cuticle is a process called _____ and is a characteristic common to arthropods.
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The head and thorax of arthropods are _____, which are functional groups of fused segments.
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The body plan of trilobites consisted of which of the following?
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Ticks, scorpions, millipedes, crabs, and locusts are all members of Phylum _____
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Select all of the following that are members of the subphylum Chelicerata.
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The shedding and re-formation of the exoskeleton to facilitate growth is known as _____
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In arthropods, body segments are often combined or fused into functional units called _____
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Chelicerate arthropods are characterized by a pair of pedipalps, a pair of chelicerae, and _____ pairs of walking legs.
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Identify the arthropods in the following figure.
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Horseshoe crabs, scorpions, spiders, and ticks belong to Subphylum _____
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Within the subphylum Chelicerata, select all organisms belonging to class Merostomata.
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Select all of the characteristics of members of Subphylum Chelicerata.
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Spiders and scorpions belong to what class?
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Which of the following are characteristics of members in Class Arachnida?
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Eurypterids and horseshoe crabs belong to Class _____ within Subphylum Chelicerata.
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In spiders, the cephalothorax and abdomen are attached by a narrow, waist-like _____
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Whip scorpions, mites, and ticks belong to Class _____ within Subphylum Chelicerata.
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In spiders, a leglike structure called a _____ has sensory functions and also serves to transfer sperm in males.
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Scorpions belong to Order _____
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All species in Class Arachnida have two _____, which consists of a cephalothorax and an abdomen.
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The narrow point of attachment between the abdomen and cephalothorax in spiders is a _____
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In spiders, the pair of leglike appendages that have sensory or reproductive functions are _____
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Study Notes
Arthropoda Overview
- Characterized by a lightweight exoskeleton composed of chitin and proteins, providing protection and facilitating movement.
- Phylum Arthropoda is the most species-rich and diverse phylum in the animal kingdom.
- Arthropods belong to the clade Panarthropoda and are classified as ecdysozoan protostomes.
Classification and Morphology
- Arthropods are divided into different subphyla based on morphological features and evolutionary relationships.
- Common classification features include the structure of mouthparts, body segments, and the presence of tagmata, which are functional groups of fused segments.
- Two primary tagmata are the head and thorax; other forms may include three distinct tagmata, as seen in trilobites.
Mouthparts and Feeding
- Common mouthparts include chelicerae in spiders and mandibles in insects and some crustaceans.
- Chelicerate arthropods possess chelicerae and pedipalps, along with four pairs of walking legs.
Exoskeleton and Growth
- Exoskeleton provides selective advantages such as protection, muscle attachment, and movable joints.
- The process of shedding the cuticle to facilitate growth is known as molting or ecdysis.
Species Examples
- Common examples of arthropods include insects, spiders, centipedes, and crustaceans.
- Spiders and scorpions are classified under Class Arachnida, characterized by two tagmata: cephalothorax and abdomen.
Subphyla and Classes
- The subphylum Chelicerata includes diverse organisms such as ticks, sea spiders, and horseshoe crabs.
- Class Merostomata within Chelicerata consists of eurypterids and horseshoe crabs.
- Class Arachnida encompasses spiders, scorpions, mites, and ticks, featuring predatory and parasitic behaviors.
Specific Anatomical Features
- The attachment point between the cephalothorax and abdomen in spiders is the pedicel.
- Pedipalps in male spiders serve sensory roles and assist in transferring sperm.
- Scorpions belong to the order Scorpiones, noted for their distinctive features and hunting methods.
Visual Identification
- Fossilized specimens such as trilobites help illustrate the diverse evolutionary history of arthropods.
- Recognition of different arthropods can be aided by understanding their morphological differences and classifications.
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Description
Test your knowledge with this set of flashcards on Arthropoda. Each card covers key concepts such as the exoskeleton, the diversity of the phylum, and classification of arthropods. Perfect for students studying animal biology and ecology.
