1 / 12

Phylum: Arthropoda

Phylum: Arthropoda. Insects, crabs, lobsters, etc…. General Information. Diversity: Over 85% of all known animals are arthropods The most successful animals on the planet! They live in the widest range of habitats and eat the greatest varieties of food

masako
Download Presentation

Phylum: Arthropoda

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Phylum: Arthropoda Insects, crabs, lobsters, etc….

  2. General Information • Diversity: • Over 85% of all known animals are arthropods • The most successful animals on the planet! • They live in the widest range of habitats and eat the greatest varieties of food • “Arthropod” – jointed legs (appendages) • Appendages are used for eating, moving, mating, respiring, feeling, sensing, or defense

  3. Group:Crustacea • The word crustacean originates from the crusty exoskeleton produced by crustaceans • Chitin – the organic material produced by the crustacean to form a hard exoskeleton • this distinguishes them from mollusks whose shells are made of calcium carbonate (CaCO3) • “Insects of the sea” • Live in all aquatic environments plus a few land-dwellers

  4. Anatomy • Exoskeleton (outer shell) • Hard, protective outer surface; this shell must be molted in order for the arthropod to grow • Muscles attach to the inside of the skeleton • Cephalothorax • the fused head and thorax section; literally means “head breastplate” (Fig 7-4) • Swimmerets • the posterior pairs of jointed appendages (legs) that mostly function as swimming legs • Walking Legs • the middle pairs of legs that are used for most movement • Maxillae & Mandibles • The anterior appendages that are used for food getting apparatuses • Antennae • Anterior pairs of appendages that are used as sensory organs

  5. Habitat • Most crustaceans live in the ocean • Lobsters, shrimp, crabs… • Some live in freshwater • Crayfish & crabs • Few live on land • Isopods and pill bugs • Even fewer are extremophiles! • Kiwahirsuta

  6. Freshwater Crab Horseshoe Crab Another freshwater crab Kiwahirsuta or the Yeti Crab

  7. Sexual Reproduction • Lobsters & Crayfish …. • Sex is determined by (somewhat) easy to see external structures • Swimmerets – • Males: • Large and point towards the front of the body • Use the 1st pair to transfer sperm to the female • Females: • Have hairs on the swimmerets that make them look like feathers • Used to hold fertilized eggs against the abdomen until ready to hatch

  8. Sexual Reproduction • Crabs • They have smaller abdomens with not so easy to see reproductive structures • Males: • Narrow abdomen that fits into a groove on the underside of the cephalothorax • Females: • The abdominal flap is very broad and covers most of the underside of the cephalothorax • She can store sperm until her eggs are ready • The female holds the fertilized eggs between the abdominal flap and the body with a natural adhesive • This is sometimes referred to as “berrying” or “berried”

More Related