22 public questions tagged with this topic.
Insects constitute more than 70% of all described animal species and represent the largest group of animals.
Ref: NCERT Class 12 Biology Chapter 13: Biodiversity and Conservation Species-Area Relationship
Aquatic arthropods and mollusks use branchial respiration, where gaseous exchange occurs through gills.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Organs and Human Respiratory System
Chitin is a polysaccharide that forms the exoskeleton of arthropods and fungal cell walls.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
Arthropods are characterized by the presence of jointed appendages, which aid in movement and other functions.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Arthropods are characterized by jointed appendages, an exoskeleton, and segmented bodies.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Mollusca and Echinodermata
Arthropods have an open circulatory system, where blood directly bathes tissues and organs.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Mollusca and Echinodermata
Arthropods do not have a water vascular system; this feature is found in echinoderms.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Arthropoda
Limulus (King crab) belongs to phylum Arthropoda and is considered a living fossil.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Arthropoda
Both annelids and arthropods exhibit metameric segmentation, where the body is divided into repetitive segments.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Arthropods have a hemocoel, where the body cavity is filled with blood and functions as an open circulatory system.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Chelicerate body divided into two primary tagmata rather than three in insects. Anterior prosoma or cephalothorax results from fusion of six segments, dorsal carapace covering eyes, chelicerae, pedipalps and four pairs of walking legs, concentrated sensory and locomotory function. Posterior opisthosoma or abdomen contains twelve segments often reduced, bearing genital aperture, respiratory organs like book lungs or book gills, spinnerets in spiders and telson in scorpions. Narrow pedicel in spiders separates prosoma and opisthosoma allowing flexibility. This bipartite prosoma-opisthosoma organization contrasts with head-thorax-abdomen pattern defining chelicerate tagmosis.
Ref: Hickman et al., Chapter 20: Chelicerata Body Division; Campbell Biology, 12th ed., Chapter 33
Chelicerata represents arthropod subphylum containing arachnids, merostomes and pycnogonids, united by absence of antennae and presence of chelicerae as first appendage pair. Chelicerae may be jackknife or pincer-like for grasping or fang-like injecting venom as in spiders. Lacking antennae contrasts with Mandibulata which possess antennae for sensory functions, mandibles for biting and second antennae in crustaceans. Chelicerates rely on pedipalps and leg sensory hairs for chemoreception. Antennal absence therefore serves as key diagnostic character separating chelicerates from insects, crustaceans and myriapods in systematics and evolutionary morphology.
Ref: Brusca & Brusca, Invertebrates, 3rd ed., Chelicerata Characters; Campbell Biology, 12th ed., Chapter 33
