Ch. 33 bio

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patterson911
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51678
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Ch. 33 bio
Updated:
2010-11-25 15:28:20
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Deuterostomes
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Ch. 33 bio
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  1. Primitive craniate characteristics?
    • · Partial cranium
    • · No vertebrae
    • · Cartilagenous skeleton
    • · Weak circulatory system with 3 accessory hearts
    • · Scavengers
    • · Produce slime as defense mechanism
    • · Four pairs of sensory tentacles surround mouth
    • · Jawless; tongue has tooth-like rasps
    • · Adults can change sex from year to year
  2. What is the most primitive craniate?
    Hagfishes
  3. All remaining chordates are and they possess what?
    craniates (possess a skull)
  4. What are some characteristics of Cephalochordata?
    • · Marine; invertebrates
    • · Larvae and adults exhibit all 4 chordata features
  5. What are Cephalochordata?
    (lancelets)
  6. What are some characteristics of Urochordatel?
    • · Marine; invertebrates
    • · Larvae exhibit all 4 chordate features; adults retain pharyngeal gill slits
  7. What are Urochordatel?
    (sea squirts, ascidians)
  8. Phylum Chordata includes 3 subphyla?
    • · Urochordata
    • · Cephalochordate
    • · Vertebrata
  9. Chordates possess 4 structures at some point in life cycle. What are those 4 points in life?
    • · Pharyngeal slits (ancestrial trait)
    • · Dorsal, hollow nerve cord (becomes spine and brain)
    • · Postanal tail
    • · Notochord
  10. What are some characteristics of Hemichordata?
    • · Bilateral symmetry; ciliated larva
    • · 3 part body plan (proboscis, color, and trunk)
  11. What are Hemichordata?
    acorn worm, pterobranch
  12. What are some characteristics of Holothuroidea?
    • Lack arms and spines
    • Reduced endoskeleton
    • 5 rows of tube feet
    • Tube feet around mouth modified as feeding tentacles; suspension feeders
  13. What are Holothuroidea?
    sea cucumbers
  14. What are some characteristics of Crinoidea?
    • · Feathered arms surrounding upward pointing mouth
    • · Suspension feeders
  15. What are Crinoidea?
    (sea lilies, feather stars)
  16. What are some characteristics of Ophiurolodea?
    • Long flexible arms
    • Distinct central disk
    • Nocturnal scavengers
  17. What are Echinoidea?
    sand dollars, sea biscuits, sea urchins
  18. What are some characteristics of Echinoidea?
    • · Roughly spherical or disk-shaped
    • · No arms
    • · Covered with spines (attached to endoskeleton via ball and socket joint)
    • · 5 rows of tube feet, enabling slow movement
    • · Mouth ringed by complex, jaw like structure –eat algae and seaweed
  19. What are Ophiurolodea?
    brittle stars
  20. What are some characteristics of Asteroidea?
    • · Star shaped body; multiple arms radiate from central disk
    • · Mouth and tube feet on oral surface
    • · Two stomachs – one everts to digest prey
  21. What are Asteroidea?
    sea stars
  22. What are the five classes of enchinodermata?
    • Asteroidea
    • Ophiurolodea
    • Echinoidea
    • Crinoidea
    • Holothuroidea
  23. Enchinodermata characteristics?
    • · Marine
    • · Larvae bilaterally symmetrical and ciliated
    • · Adult has radial symmetry (most)
    • · No head; oral – aboral body surfaces
    • · Internal skeleton of fused calconeous plates; covered by skin and some muscle.
    • · Unique water vascular system with tube feet
  24. Vertebrates?
    vertebral column, ventral hear, anterior skull, large brain
  25. Chordates?
    notochord dorsal hollow nerve chord, post anal tail
  26. What are Chordata?
    sea squirts, lancelets, vertebrates
  27. What are Hemichordata?
    acorn worms, pterobranchs
  28. What are Echinodermata?
    sea stars, sea urchins
  29. What are the three major phyla of deuterostomes?
    • Echinodermata
    • Hemichordata
    • Chordata
  30. Deuterostomes characteristics?
    • · Triploblastic
    • · Bilateral symmetry
    • · Embryonic blastopore becomes anus
    • · Exhibit radial cleavage
    • · Endoskeleton
    • · Coelom develops from mesodermal outpocketings of the archenteron

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