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Phylum Arthropoda includes over 900,000 species of animals with jointed legs and segmented bodies, including insects, crustaceans, arachnids, and others. They make up over 82% of all living things and have characteristics like an exoskeleton made of chitin, a segmented body, and jointed appendages for locomotion and feeding. Arthropods have open circulatory systems, respiratory systems adapted for terrestrial or aquatic environments, and undergo metamorphosis during development. They play important ecological roles as pollinators, decomposers, predators, and more.
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This document summarizes the characteristics of the phylum Mollusca. It describes their soft unsegmented bodies, bilaterally symmetrical structure, and hard calcareous shells. It divides the body into a head, mantle, visceral mass, and foot. It provides details on their digestive, respiratory, circulatory, excretory, and nervous systems. It lists the six major mollusc classes and provides one example for each: Monoplacophora, Amphineura, Scaphopoda, Gastropoda, Pelecypoda/Bivalvia, and Cephalopoda.Phylum Mollusca | It's Classes | Characteristics | Features | Presentation | ...
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1. The document is a dating profile posted by a mollusk looking for a mate. It provides information about mollusks, including their habitat, anatomy, behaviors, defenses, and intelligence.
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Here are definitions of the key terms:
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Postanal tail - The muscular structure behind the anus that is present in early chordate embryos.
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油
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油
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The document provides an overview of the phylum Mollusca, including general information about their anatomy, habitat, reproduction cycles, classes, and examples. The phylum contains over 90,000 living species ranging from microscopic to over 20 meters in size. They are mostly marine but also found in freshwater and terrestrial environments. Their body plans and features vary between classes but generally include a mantle, visceral mass, and foot, with some having shells.Similar to F2 zoo ppt (20)
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2. Both phyla exhibit bilateral symmetry and segmentation of the body. In annelids, segments contain redundant organs, while in arthropods segments are specialized and contain jointed appendages.
3. Arthropods have an exoskeleton made of chitin, segmented bodies, and jointed appendages adapted for different functions. They dominate terrestrial habitats due to key adaptations like the exoskeleton and tracheal breathing system.Crustacean powerpoint
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Submitted Date: April 4, 2025
Paper Name: The Twentieth Century Literature: From World War II to the End of the Century
Topic: From Watchdog to Lapdog: Ishiguros Fiction and the Rise of Godi Media in Post-2014 Indian Journalism
[Please copy the link and paste it into any web browser to access the content.]
Video Link: https://youtu.be/kIEqwzhHJ54
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- 2. PHYLUM ARTHROPODA Ex.Insects, crustaceans (crabs), arachnids (spiders), etc Over 900 000 species Found in every habitat on earth Arthropods make up over 82% of all living things 1018 arthropods living right now!
- 3. ARTHROPOD CHARACTERISTICS Segmented body = Specialization Head Contains mouth parts, sense organs, antenna Thorax Attachment of appendages Cephalothorax = head & thorax fused Abdomen Organs, few appendages
- 4. ARTHROPOD CHARACTERISTICS Exoskeleton = Protection Hard covering outside of ectoderm Made from chitin (protein) Protects organs Prevents water loss (waxy cuticle) Site of muscle attachment Limits the size an arthropod can grow (heavy!) Exoskeleton does not grow once it has formed organism must molt and regrow skeleton to increasesize
- 5. ARTHROPOD CHARACTERISTICS JointedAppendages = Locomotion, feeding, reproduction Uniramous (single branch) eg. Insects Biramous (two branches) eg. Crustaceans
- 6. ARTHROPOD CHARACTERISTICS Body Type: Bilateral Symmetry Body Organization: Triploblastic (3 layers) Body Cavity: Coelom (fluid filled cavity fully lined by mesoderm)
- 7. ARTHROPOD CHARACTERISTICS Digestive System Complete Mouth and anus separate Specialized by segmentation Specialized mouthparts Chelicera Piercing, sucking or Mandible Biting, chewing
- 9. ARTHROPOD CHARACTERISTICS Excretory System Anus Malpighian Tubules (terrestrial) Nitrogenous wastes crystalized and combined with feces Conserve water Green Gland (aquatic) Concentrates nitrogenous wastes Excreted nead base of antennae
- 11. ARTHROPOD CHARACTERISTICS Reproduction Sexual Dioecious Internal fertilization (terrestrial, some aquatic) or external fertilization (some aquatic) Asexual Some species are able to regenerate lost limbs Undergo metamorphosis Complete: egg larva pupa adult Incomplete: egg juvenile - adult
- 14. ARTHROPOD CHARACTERISTICS Nervous System Brain Ventral nerve cord Specialized sensory organs Antenna Compound eyes & ocelli Olfactory organs
- 15. ARTHROPOD CHARACTERISTICS Respiration Aquatic - Gills Terrestrial Book lungs (arachnids) Trachea/Spiracles (insects)
- 16. ARTHROPOD CHARACTERISTICS Circulatory System Open circulation Blood pumped by heart to sinuses around tissues Blue colour due to copper http://www.iflscience.com/plants-and-animals/how-horseshoe-crab- blood-saves-millions-lives
- 18. ARTHROPOD CHARACTERISTICS Ecological Roles Predators/Prey Parasites/Vectors (lice, ticks, mosquitos) Food source Agricultural pests (locusts, catepillars, beetles, ) Pollinators (bees, butterflies) Produce honey, silk Medical uses (bee pollen, crab blood)