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BISC120 Final > 22 Metozoa to Protosomes > Flashcards

22 Metozoa to Protosomes Flashcards

1
Q

metozoa v umetozoa

A

umetozoa are animals with true tissue
metozoa animals no true tissue

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2
Q

Protostomes

A
  • distinguished by embryonic development
  • 1st opening is mouth
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3
Q

Platyhelminthes

A
  • aka Flatworms
  • Triploblastic
  • acoelomate
  • bilateral symetry
  • hermaphroditic
  • one whole for mouth and anus
  • “U” shaped gut
  • eyespots deter predators
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4
Q

Platyhelminthes Parasitic example

A

Tapeworm
- lack mouth and gut
- absorb nutrients through skin
- less structures for parasites
- reproduce by exiting feces and infecting others usually through a water source

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5
Q

Rotifera

A
  • minor group of lophotrochozoan
  • have alimentary canal means a tube with a mouth and anus
  • pseudo coelom
  • crown of cilia draw vortex of water in and internal jaw called trophi grinds up the food
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6
Q

Ectoprocts and Brachiopods

A
  • minor group of lophotrochozoan
  • lophoporates= have lophophores which are feeding structures ciliated by tentacles
  • coelomates
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7
Q

Mollusca

A
  • minor group of lophotrochozoan
  • all have: radula, nerve cords, heart, coelom, gills, TROCHOPHORE LARVAEA
  • most have a mantle which secretes a shell and are benthic
  • HAM= hypothetical ancestral model
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8
Q

Common characteristics of Mollusca

A
  • mantle secreting shell
  • muscular foot
  • chambered heart
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9
Q

Phylum Mollusca
1. Monoplacophora
2. polyplacophora

A
  • Monoplacophora = limpets
  • polyplacophora= chitons
  • both make home scars
  • home scars: make indents in the rock that they keep coming back to so once the indent is perfect there is nothing that can lift it up off the rock
  • clamp down with foot
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10
Q

Phylum Mollusca
3. Gastropoda

A
  • means belly foot
  • ctenidia= respiratory organ
  • disadvantage is dump feces on head
  • torsion: strait canal to flipped shell which benefited them by not being uneven so they are stable, head can go in first to protect from predator, keeps moisture in shell
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11
Q

Phylum Mollusca
4. Bivalvia

A
  • 2 shells
  • suck in clean water eat things then deposit clean water below them
  • all have trocophore larvae
  • cilia crown
  • simple bivalve cycle
  • benthic
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12
Q

Phylum Mollusca
5. Cephalopoda

A
  • use jet repulsion for swimming
  • chambered natulises are the only living cephalopods with an external shell
  • ex: octopus, squid, nautilus
  • COOLEST is the octopus
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13
Q

Phylum Annelida

A
  • lophotrocozoa
    • segmented body
      - trocophore larvae
  • aka segmented worms
  • 2 types
    • oligochaeta
      - polychaetes
  • leeches
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14
Q

Oligochaeta

A

Oligarchaeta = terrestrial worm
- Bilateral symmetry
- Triploblastic,
- coelomate
- Cephalization
- Respiration, circulatory, excretory,
reproductive organs (gonochoric)
17k spp.; marine and terrestrial
- Special features : Repeated body segments,
Collagenous cuticle; not molted

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15
Q

Polychaetes

A

Polychaetes = mostly marine
Each body segment has a pair of fleshy
protrusions called PARAPODIA that bear
many bristles, called CHAETAE, which are
made of chitin

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16
Q

Leeches

A
  • use bladelike jaws to slit the skin
    of the host
  • host is often oblivious because
    the leech secretes an anesthetic
  • after incision, the leech secretes
    hirudin, which keeps the blood of
    the host from coagulating
  • parasites
17
Q

Phylum Nematoda

A
  • long, thin, threadlike “worms” with a thick cuticle.
  • Head is small and possesses only small sense organs, it is small
  • Use pseudo coelom as a hydrostatic skeleton secreted by epidermis.
  • complete gut: mouth, muscular pharynx, intestine, rectum, and anus
  • layer of longitudinal muscles that “play against” the cuticle to yield alternating movement.
  • found in all environments
    ex: hook worm
18
Q

hook worm

A

a Nematoda
- large plates in mouth cut intestinalis lining
- adds anti clotting factors
- can cause anemia or death because it sucks more blood than they can use
- larvae hatches then penetrates skin of person

19
Q

Guinea Worms

A

a Nematoda
- get when drink water
- penetrates gut wall
- leaves through foot causing blistering
- no cure must unwind it on a stick slowly for weeks

20
Q

Filarial Worms

A

Nematoda
- attacks lymphatic system so you don’t have enough fluids
- can lead to elephantiasis
- common in tropical regions and spread by mosquitos
- often in dogs heart and lungs and up to 40cm long

BISC120 Final (5 decks)

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