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Class Anostraca

Class Anostraca. Fairy and brine shrimp 27 trunk segments; only anterior segments (thorax) with appendages (phyllopoda) Thorax and abdomen distinct only by presence of appendages. Class Branchiopoda. Water fleas Clear separation of tagmata reduced; head and trunk Mouth simple

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Class Anostraca

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  1. Class Anostraca • Fairy and brine shrimp • 27 trunk segments; only anterior segments (thorax) with appendages (phyllopoda) • Thorax and abdomen distinct only by presence of appendages

  2. Class Branchiopoda • Water fleas • Clear separation of tagmata reduced; head and trunk • Mouth simple • Thoracic appendages adapted for swimming; Abdomen lacks appendages • Apparent segmentation lost • Body shape is different from carapace • Microscope slide of Daphnia

  3. Class Malacostraca • Large group of Crustacea (>20,000 species) • See intro p.625 of lecture text for key features (Fig 19-19) • General theme • 3 tagmata • Biramous, uniramous, biramous

  4. Order Stomatopoda • Mantis shrimp • Depressed body • 3 tagmata • Shield-like carapace • Raptorial 1st pair thoracic appendages • First antennae triramous • P. 627

  5. Order Decapoda • Largest order of Malacostraca • Both antennae biramous • 2 tagmata (cephalothorax and abdomen) • Biramous, uniramous, biramous. • Modification of first periopod in many • Mouthparts 6, thoracic appendanges 5 • Divergence of mouthparts varies

  6. Order Mysidacea • Shrimp-like but not decapods because retain many primitive characteristics • Head with 3 fused thoracic segments • Carapace onlyy attached 1st – 3rd thoracic segments but looks like cephalothorax • Tagmata not fused

  7. O. Amphipoda • Compressed body • No carapace • 3 tagmata • 1 – 2 thoracic segments fused to head (8 thoracic segments) • Gnathopods are first two pair thoracic appendages not fused to head • 6 segments Ab split into two parts

  8. O. Isopoda • 3 tagmata • Head and 1st thoracic segment fused • Depressed body • The 7 thoracic appendages generally unspecialized (all look the same) • Last Ab segment fused with telson (pleotelson) • Remaining Ab segments (5) have biramous pleopods • Biramous, uniramous, biramous preserved specimens

  9. Class Copepoda • Body tapers anterior to posterior • Short trunk (Th + Ab) 10 or fewer segments • Head includes 3 fused thoracic segments • Ab 4 segments, no appendage • Posterior extensions rami, not uropods as in Malacostraca • 1st antennae variabe in size, can be long • On slides

  10. Class Cirripedia

  11. Order • d

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