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Chordate Phylogeny

Chordate Phylogeny. “Protostomes” vs. Deuterostomes. Ancestral deuterostome. Chordate Phylogeny. Echinodermata. Echinodermata about 6000 species. Chordate Phylogeny. A. P. Trochophore larva. body wall. gut wall. Chordate Phylogeny. lumen. outside. coelom. “eucoelomate”.

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Chordate Phylogeny

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  1. Chordate Phylogeny “Protostomes” vs. Deuterostomes

  2. Ancestral deuterostome Chordate Phylogeny Echinodermata

  3. Echinodermata about 6000 species

  4. Chordate Phylogeny A P Trochophore larva

  5. body wall gut wall Chordate Phylogeny lumen outside coelom “eucoelomate”

  6. Chordate Phylogeny Echinodermata Hemichordata Ancestral deuterostome

  7. Hemichordata trunk collar proboscis Enteropneusts AKA Acorn worms

  8. + Pterobranchs

  9. Body wall Pharynx lumen H2O Chordate Phylogeny pharyngeal perforations…

  10. A Chordate Phylogeny Echinodermata Hemichordata Ancestral deuterostome

  11. Chordate Phylogeny Xenoturbellida Echinodermata Hemichordata Ancestral deuterostome

  12. Chordate Phylogeny Xenoturbella bocki

  13. X Chordate Phylogeny Xenoturbellida Echinodermata Hemichordata Ancestral deuterostome

  14. Chordate Phylogeny Xenoturbellida Echinodermata Hemichordata The traditional point of view… Ancestral deuterostome

  15. Chordate Phylogeny Phylum Chordata: notochord dorsal, tubular nerve cord pharyngeal perforations skeletal/muscular post-anal tail Xenoturbellida Echinodermata Hemichordata The traditional point of view… Ancestral deuterostome

  16. Chordate Phylogeny • notochord • chordamesoderm…

  17. DBL

  18. neurectoderm chordamesoderm

  19. dorsal tubular nerve cord chordamesoderm Lumen

  20. dorsal tubular nerve cord neural plate chordamesoderm Lumen

  21. neural folds Lumen

  22. neural groove Lumen

  23. dorsal tubular nerve cord Lumen

  24. Body wall Pharynx lumen H2O Chordate Phylogeny • pharyngeal perforations

  25. Chordate Phylogeny muscular and skeletal post-anal tail

  26. Chordate Phylogeny Phylum Chordata… notochord dorsal, tubular nerve cord pharyngeal perforations skeletal/muscular post-anal tail Xenoturbellida Echinodermata Urochordata Hemichordata Ancestral deuterostome

  27. Urochordata Sea squirts AKA tunicates “larvaceans” about 1500 species “Die Locher sind die Hauptsache an einer Sieb”

  28. pharyngeal perforations

  29. oral siphon statocyte pharynx atrial siphon notochord Tunicate larva adhesive papillae

  30. Tunicate larvae…

  31. Chordate Phylogeny Phylum Chordata… Xenoturbellida Echinodermata Urochordata Cephalochordata Hemichordata Ancestral deuterostome

  32. muscle bundles notochord dtnc tail “lancelets”, “Amphioxus”, Branchiostoma, about 15 species pharyngeal basket note metamerism in musculature

  33. endostyle dtnc notochord muscle bundle pharyngeal bar intestine gonad atrium pharynx lumen

  34. Chordate Phylogeny Phylum Chordata… Xenoturbellida Echinodermata Craniata Urochordata Cephalochordata Hemichordata Ancestral deuterostome

  35. Chordate Phylogeny Phylum Chordata??? Xenoturbellida Echinodermata Craniata Urochordata Cephalochordata Hemichordata Ancestral deuterostome

  36. Chordate Phylogeny Phylum Chordata??? Xenoturbellida Echinodermata Craniata Urochordata Cephalochordata Hemichordata C + C Ancestral deuterostome

  37. Chordate Phylogeny P A notochord mouth

  38. otic optic olfactory Chordate Phylogeny P dtnc A notochord

  39. Chordate Phylogeny otic capsule optic capsule nasal capsule P A notochord

  40. Chordate Phylogeny otic capsule optic capsule nasal capsule P dtnc A notochord The nasal capsule is a “cranial cartilage” associated with the olfactory lobe…

  41. Chordate Phylogeny otic capsule optic capsule nasal capsule P dtnc A notochord Unifying synapomorphies??

  42. Chordate Phylogeny Xenoturbellida Echinodermata Craniata Urochordata Cephalochordata Hemichordata C + C Ancestral deuterostome

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