Ecdysozoa-Arthropoda

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schoenbe
ID:
268534
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Ecdysozoa-Arthropoda
Updated:
2014-03-31 01:05:44
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  1. Phylum Arthropoda
    • most species rich phlyum
    • most ecologically important group of animals
  2. Arthropoda Characteristics
    • Cephalization
    • Jointed appendages
    • segmented body
    • sclerotized cuticle made of chitin
  3. Cephalization
    head region is composed of several segments with specialized functions
  4. Importance of sclerotized cuticle
    • acts as exoskeleton
    • provides support
    • surface for muscle attachment
    • molt
  5. Cephalothorax
    head and thorax are fused together
  6. Body segments roles
    • head: eating and sensory
    • thorax: locomotion
    • abdomen: digestion and reproduction
  7. Subphylum Crustacea (crabs, lobsters, shrimp etc)
    mostly marine some freshwater and terrestrial
  8. Crustacean Morphology
    • 2 pairs of antennae
    • compound eyes
    • often cephalothorax (covered by carapace)
    • main mouthparts are mandibles
    • appendages help guide food
    • exoskeleton hardened by calcium carbonate
  9. Crustacean use of different limbs
    • Thoracic: locomotion
    • Abdominal: swimming, filter feeding and holding eggs
  10. How do crustaceans breath?
    • aquatic: gills 
    • terrestrial: trachea
  11. Crustacean life cycle
    • separate sexes
    • sperm transferred through copulation
    • brood eggs
    • direct and indirect development
  12. Crustacean Ecology
    • detrivores (consume waste), scavengers and predators
    • filter-feed (shrimp and barnacles)
    • commensals or parasites
  13. Hexapods (insects and springtails)
    • 6 legged arthropods
    • class instecta and collembola
  14. Shared features of Hexapods and Myriapods
    • one pair of antennae
    • mandibles
    • trachea
  15. Hexapod morphology
    • Head: one pair of antennae
    • Thorax: 3 pairs of jointed legs
    • Abdomen: no paired jointed appendages
  16. Class Collrmbola (Hexapod) "springtails"
    • appendages at end of body for jumping
    • osmoregulation (controls concentration of fluids)
    • collophore- produces sticky glue
  17. Class Insecta (Hexapod)
    • pair of segmented terminal appendages (cerci)
    • compound eyes and ocelli (simple eye)
  18. Insecta wings
    • primitive groups lack wings
    • most adults have wings
    • wings are synapomorphy of clade
  19. Types of Hexapoda life cycles
    incomplete metamorphosis:  juveniles share same appearance and habitat as adult

    complete metamorphosis: wings develop in pupa stage, different morphology and habitat
  20. Hexapod Reproduction
    no hermaphrodites
  21. Types of Hexapoda fertilization
    Spermatophore: Collembolans and apertygote, indirect sperm transfer

    Copulation: pterygote, direct sperm transfer
  22. Myriapoda (millipedes and centipedes)
    • at least three pairs of legs
    • less tagmatized
    • direct development
    • only terrestrial
  23. Class diplopoda (millipedes)
    • 2 pairs of legs/segment
    • detritivorous or herbivorous
  24. Class Chilopoda (centipedes)
    • mainly carnivorous
    • one pair legs/segment
    • one pair of legs modified as mouthparts
    • can be poisonous
  25. Chelicerata (scorpians, horseshoe crabs, spiders, mites)
    • lack antennae
    • chelicerae as moutparts (2 or 3 segmented pincers)
  26. Chelicerata body plan
    • 2 main tagmata
    • Cephalothorax: 6 pairs of limbs, eyes
    • abdomen: may have appendages, contains cut and reproductive organs
  27. Class Arachnida (chelicerata)-spiders, mites and scorpions
    • separate sexes
    • only feed on fluids
    • simple eyes (ocelli)
  28. Class Arachnida- Order Araneae (spiders)
    • 2 segmented chelicerae (mouth parts)- excretes poision
    • 0-4 pairs of ocelli
    • trachea and/or book lungs
    • spinnerets on abdomen
    • maternal care and complex courtship
  29. Class Arachnida- Order Scorpiones (scorpions)
    • crush or sting prey
    • externally digest
    • courtship and brood
  30. Class Arachnida- Order Acari (mites)
    • no separation between cephalothorax and abdomen 
    • external segmentation
    • 2-3 segmented chelicerae
    • 0-2 pairs ocelli
  31. Chelicerata- Class Xiphosura (horseshoe crabs)
    • not related to crabs
    • compound eyes
    • book gills (resemble pages of book)
    • long terminal spine=tail
  32. Xiphosura ecology
    • scavenge on dead plants and animals
    • prey on small soft bodied animals
    • spawn just above tide
  33. Deuterostomia
    • phyla: Echinodermata & Chordata
    • triploblastic 
    • radial intermediate cleavage
  34. Phylum

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