Basal vertebrates; Origin of chordates at Wageningen University

Flashcards and summaries for Basal vertebrates; Origin of chordates at the Wageningen University

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Study with flashcards and summaries for the course Basal vertebrates; Origin of chordates at the Wageningen University

Exemplary flashcards for Basal vertebrates; Origin of chordates at the Wageningen University on StudySmarter:

What are some new developed synapomorphic characters in craniates (8 characteristics)?

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What is the reason that the nervous tissue serving the segmental myomeres became more consolidated (stronger and better)?

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Name three groups belonging to the Protostomia

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Name the 3 groups of deuterostomia

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Ontogeny characteristics of Protosomia

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Ontogeny characteristics of Deuterostomia

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Amulacraria (groups)

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Examples for Echinodermata (3)

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Examples for Hemichordata (2)

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Synapomorphic characters of hemichordata (3)

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Synapomorphic characters of Pterobranchia (4)

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Synapomorphic characters of Enteropneusta  (4)

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Exemplary flashcards for Basal vertebrates; Origin of chordates at the Wageningen University on StudySmarter:

Basal vertebrates; Origin of chordates

What are some new developed synapomorphic characters in craniates (8 characteristics)?

  • Braincase, 
  • muscular pharynx, 
  • advanced nervous system, endocrine system, 
  • digestive organs,
  • heart, 
  • gills
  • hemoglobin

Basal vertebrates; Origin of chordates

What is the reason that the nervous tissue serving the segmental myomeres became more consolidated (stronger and better)?

For more effective control of contraction as the chordates started to develop more

Basal vertebrates; Origin of chordates

Name three groups belonging to the Protostomia

Molluscs, Annelids, Arthropods

Basal vertebrates; Origin of chordates

Name the 3 groups of deuterostomia

Echinodermata, Hemichordata, Chordata

Basal vertebrates; Origin of chordates

Ontogeny characteristics of Protosomia

  • Spiral cleavage
  • mosaic embryo
  • blastopore becomes mouth (anus forms secondarily)
  • coelom forms by splitting (schizocoelom)

Basal vertebrates; Origin of chordates

Ontogeny characteristics of Deuterostomia

  • Radial cleavage, 
  • regulative embryo, 
  • blastopore becomes anus (mouth forms secondarily), 
  • coelom forms by outpocketing (enterocoelom)

Basal vertebrates; Origin of chordates

Amulacraria (groups)

Echinodermata, Hemichordata

Basal vertebrates; Origin of chordates

Examples for Echinodermata (3)

Starfish, sea-urchins, sea cucumbers

Basal vertebrates; Origin of chordates

Examples for Hemichordata (2)

Enteropneusta, Pterobranchia

Basal vertebrates; Origin of chordates

Synapomorphic characters of hemichordata (3)

Tripartite body (Proboscis, collar,trunk)

Basal vertebrates; Origin of chordates

Synapomorphic characters of Pterobranchia (4)

  • Collar transformed into feeding arms
  • U-shaped trunk (anus near feeding arms), 
  • collar ganglion
  • few pharyngeal slits

Basal vertebrates; Origin of chordates

Synapomorphic characters of Enteropneusta  (4)

  • Collar nerve cord
  • 3 coelomic cavities, 
  • Pharyneal pores and tongue bars
  • stomochord                                    

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