Card Set Information
Echinoderma, Hemichordata, Chordata
What are the apomorphies of Bilateria?
Distinct dorsal and ventral surfaces
Nervous concentration at anterior end
Filtration excretory organs
What are the apomorphies of Deuterostomie?
: process by which embryos develop in which a coelom is formed by pouches pinched off the digestive tract
Blastopore becomes anus
Endodermal suspecion-feeding pharynx with gill slits
What are the apomorphies of Ambulacraria?
Planktotrophic larva with circumoral ciliary band
What are the apomorphies of Echinodermata?
Multiple connective tissues
Loss of gill slits
What are the apomorphies of Crinoidea?
Body divided into crown and stem
Ams with pinnules
Ring canal bears many stone canals
Heart, kidney absent
What are the apomorphies of Eleutherozoa?
Oral surface faces substratum
Locomotory tube feet
: controls entry of seawater
Polian vesicles on the ring canal
What are the apomorphies of Asteroidea?
Eye spot at each arm tip
Paired pyloric cecum in each arm
Gastric hemal tufts
Gonads in arms
What are the apomorphies o Crystosyringida?
Radial nerves are internalized in the epineural canal
What are the apomorphies of Echinozoa?
Oral surface and ambulacra expanded aborally to cover most of the body
Ossicles form ring around th pharynx
Ossicles in tube feet
Suckered tube feet
Well-developed hemal system with rete mirabile
What are the apomorphies of Ophiuruoidea?
Arms sharply set off from disc
Veritbral ossicles in arms
(tiny bones, skeleton armor)
What are the apomorphies of Echinoidea?
Test of fused ossicles
Two skeletal pores for each tube foot
has 10 ossicles (surrounds anus)
Polian vesicles lost
What are the apomorphies of Holothuroidea?
Minute ossicles in thick dermis
Body wall musculature in 5 longitudinal bands
Microphagus, retractable buccal podia
What are the apomorphies of Hemichordata?
Doral and ventral longitudinal nerve cords
Stomochord antagonizes contractile pericardium
Valved collar ducts
Muscular locomotory-secretory protosome<
What are the apomorpies of Chorata?
Dorsal hollow nerve cord with open anterior neuropore
: flexible rod, supports back
Pharynx with endostyle
Ventral postoral heart
Cross-striated longitudinal muscles for swimming
What are the apomorphies of Tunicata?
Neural gland ventral to the cerebral ganglion
Tubular notorcord with extracellular lumen
Whatare the apomorphies of Metameria?
What are the apomorphies of Cephalochordata?
Muscular notorcord extends into rostrum
Asymmetric planktotrophic larva
What are the apomorphies of Vertebrata?
Blood vessels have endothelia
Hemocytes with hemoglobin
Glomerular metanephridial system