bio122 Invertebrates: Annelida

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jgascaco
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199842
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bio122 Invertebrates: Annelida
Updated:
2013-02-13 02:50:50
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Annelida Bioe122
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Annelids Phyllum vocab
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  1. Annelida
    • "ringed"
    • segmented worms
    • Metameric
    • teloblastic growth
    • annelidan cross
  2. Metamerism
    highly repetitive body
  3. Annelida classes
    • Polychaetes "many bristles"
    • Clitellata"collar worm" which includes:
    • - oligochaetes "few bristles" - Hirudinea "leech"
    • Sipuncula "siphunculus = little pipe"
    • Echiura "spiny tails"
  4. class: polychaetes
    • "many bristles"
    • segmented
    • cuticle
    • parapods
    • chaete
    • longitudial, oblique, and circular muscles
    • coelom
    • closed circ. system
    • marine
    • burrowing and crawling
  5. class: Citellata
    • "collar worm"
    • hermaphroditic
    • direct development
    • clitellum
    • no parapodia and cheatea
    • decephalacized
  6. subphylum: oligochaetes
    • "few bristles"
    • similar to ancestor bp
    • lack parapod
    • dorsal coelopore (terrestrial)
    • esophageal glands
    • O2 exchange across cuticle
    • u-shaped stomach
    • marine, fresh water, terrestrial
    • gas exchange across cuticle
  7. subphylum: hirudinea
    • "leech"
    • citellum
    • d-v flattening
    • modified a-p regions
    • terminal segments
    • no bristles
    • coelomate reduction
    • diagonal muscles, d-v mussles
    • gills
    • eversible pharynx
    • protoandric
    • reproductive system complex
  8. phylla: sipuncula
    • "little pipe"
    • 2 coelomic cavities
    • J gut
    • no hemal system
    • molluscan cross
    • burrowing
    • molluscan cross
    • spiral cleavage
    • protostomous
    • schizocoely
  9. phylla: echiura
    • "spiny tail"
    • large proboseis
    • trunk coelom
    • burrowing
    • closed circ system
    • spiral cleavage
    • protostomous
    • schizocoely
  10. protostomium
    anterior "segment" which houses the head
  11. cuticle
    protective covering
  12. coelom
    fluid filled sacs that keep organs together 
  13. cerci
    pair of sensory structures
  14. dorsal pore (coelomopore)
    pore that lubricates epidermus
  15. dorsal-ventral muscles
    longitudial muscles help in contraction (locomotion, circulatory, digestive)
  16. pelagosphera
    larval stage is a defining (apomorphic) character for Sipuncula
  17. anal sac
    • Echuiran excretory function
    • outpocket from the rectum
    • muscular, with surface dotted w many thousands of ciliated funnels resembling nephrostomes
    • like metanephridia, the funnels collect soelomic fluid (there is no indication of secretion or reabsorption)
    • fluid is discharged through the anus, rather than through a nephridipore via periodic muscular contractions of the sacs
  18. annelidan cross
    interadial orientation
  19. pygidium
    the end segment of an annelid that contains the anus, posterior
  20. peritaneum
    coelom lining
  21. parapod
    • fleshy extensions of body wall in polycheates
    • notopod (top of parapod)
    • neuropod (bottom half of parapod)
    • cirrus (end tip of parapod)
    • Acciculum (rod in parapod that chaetae come out of)
    • Chaete (bristles)
  22. cirri
    tentacles
  23. oblique muscle
    • helps with muscle contraction 
    • have support rods
  24. compensation sac
    • ceolomic cavities in the head and trunk
    • for retraction
  25. proboscis
    •  the everted/protrusible pharynx
    • penetration organ
  26. peristomium
    3 first segments of the body are fused
  27. ganglion
    discrete mass of nervous tissue in the prostomium
  28. epitoke
    planktonic spawning form with large eyes and parapods
  29. calciferous gland
    • series of esophageal glans
    • allows body to remove c02
  30. clitellum
    • glandular region of body wall
    • for reproduction (gamete production)
  31. introvert
    • contracting the body wall musculature causes the introvert to be thrust out of the body
    • contracting well-developed introvert retractor muscles draws the anterior end of the animal back inside the trunk
  32. trochophore
    larval stage

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