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What are the apomorphies of Panarthropoda?
What are the apomorphies of Tardigrada?
- 4 pairs of short, uniramous legs
- Protocerebrum with neural connection to ganglion of first legs
- Sucking pharynx
- Eutelic: fixed number of cells when maturity reached
- Body consists of head + 4 trunk segments
- Anteriormost appendages vestigial
- Stylet: probe
What are the apomorphies of Onycophora?
- Stubby appendages without articulations
- Tracaea tufted and unbranched
- Multiple nerve commisures per segment
- Oral papillae with slime gland
- Body wall muscles in continuous sheets
What are the apomorphies of Arthopoda?
- Aticulated exoskeleton formed of plates
- Jointed appendages
- Sheets of muscles replaced by individual muscles
- Head with acron plus five segments
- One pair of pre-oral antennau plus 3 additional appendages
- One pair of lateral compound eyes
- Four pairs of median ocelli
- Six pais of saccate nephridia
- Larvae with three pairs of appendages
What are the apomorphies of Phyllopodomorpha?
- Compound eyes are stalked
- Fine particulates filtered from open water
What are the apomorphies of Anostraca?
- No carapace - hard upper shell
- Stalked compound eyes
- Turgor appendages
- Thoracic appendages are phyllopodous
- Suspension feeders/bottom scrapers
- Little regional specialization
What are the apomorphies of Phyllopoda?
- Sessile eye compound is sunken below surface of head Eye has extrinsic muscles and is movable
- About 30 thoracopods
What are the apomorphies of Malacostraca?
- Multiramous 1st antennae
- 5 head segments
- 15 trunk segments (8 thoracic, 7 abdomen)
- Uropod: forms part of tail fin
- Carpace does not enclose limbs, stomach
What are the apomorphies of Decopoda?
- Carpace covers and fuses with all thoracomeres
- Cephalothorax includes three thoracomeres
- Abdomen well developed in primitive forms (shrimp, lobster) and reduced/vestigial in more advanced forms (crab)
What are the apomorphies of Peracarida?
Ventral marsupium composed of oostegites; direct development
What are the apomorphies of Maxillopoda?
- Max 10 trunk segments + a telson and furca
- Max 7 thoracic segments
- Appendages are resticted to the thoracic segments
- Abdomen had 3 appendageless sements
- Short, ovoid heart
- Naupliar eye has three pigment cup ocelli
What are the apomorphies of Copepoda?
- Cephalothorax composed of head and first thoracomere
- First thoracopod is a maxilliped
- Male antennae 2 are prehensile
- Sppermatophores present
- Female has seminal receptacle
- Eggs enclosed in a secreted egg sac
What are the apomorphies of Cirripedia?
- Nauplius larva have glandular frontal horns and a caudal spine
- Cypris larva
- Adult fiter feeds
- Abdomen is lost
- Specialized filiform sperm
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