Card Set Information
Panarthropoda: Tardigrada, Onycophora Arthropoda (Tetraconata- Crustacea)
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
: fixed number of cells when maturity reached
Body consists of head + 4 trunk segments
Anteriormost appendages vestigial
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
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?
- hard upper shell
Stalked compound eyes
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)
: 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
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
Adult fiter feeds
Abdomen is lost
Specialized filiform sperm