Download Deuterostomes

BSC 2011L
Phylum Echinodermata
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Now we are dealing with the
deuterostomes (1st embryonic blastophore
becomes anus)
Marine
“spiny-skinned”
Endoskeleton covered by living tissue
Adults are radially symmetrical but larvae
are bilaterally symmetrical
Water vascular system
Digestion – complete
Circulation – poorly developed
Phylum Echinodermata
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Class Asteroidea
 Starfish
Phylum Echinodermata
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Class Ophiuroidea
 Brittle stars
Phylum Echinodermata
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Class Echinoidea
 Sea urchins, sand dollar
Phylum Echinodermata
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Class Holothuroidea
 Sea cucumbers
Phylum Echinodermata
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Class Crinoidea
 Sea lillies
Phylum Echinodermata
Class Asteroidea
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Animal:
Symmetry:
Body cavity:
Digestion:
Circulation:
Segmentation:
Appendages:
Nervous:
Habitat:
Respiration:
Excretion:
Locomotion:
Support:
Starfish
radial adult, bilateral larvae
coelomate – deuterostome
mouth, evertable stomach
poorly developed
no
arms
radial nerves
aquatic
skin gills, tube feet
amoeboid cells
arms, tube feet
endoskeleton
Starfish model
Chordate Characteristics
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Dorsal tubular
nerve cord
Dorsal
supporting rod,
notochord
Post anal tail
Pharyngeal
pouches that
become gill slits
Phylum Chordata
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Subphylum Urochordata
 Tunicates or sea squirts
 Gill slits are only remaining characteristic of
chordates in adults
Phylum Chordata
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Subphylum Cephalochordata
 Amphioxus
 Shallow marine waters
 Buried in substrate with anterior portion
sticking out
 Digestion – complete (filter)
 Circulation - closed
Phylum Chordata
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Subphylum Vertebrata
 Notochord replaced by vertebral column
 Jointed skeleton
 Skull that protects well developed brain
○ Extreme degree of cephalization
 Well developed muscles
 Extremely mobile
 Reproduction is usually sexual
Vertebrate Anatomy
Phylum Chordata
Subphylum Vertebrata
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Superclass Agnatha
 Jawless fish
Phylum Chordata
Subphylum Vertebrata
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Superclass Gnathostoma
 Animals with jaws
Phylum Chordata
Subphylum Vertebrata
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Superclass Gnathostoma
 Class Chondrichthyes
○ Cartilaginous fish
○ Lack operculum and swim bladder
○ 2 chambered heart
○ Tail fin usually asymmetrical
Phylum Chordata
Subphylum Vertebrata
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Superclass Gnathostoma
 Class Osteichthyes
○ Bony fish
○ Operculum, swim bladder
○ 2 chambered heart
Phylum Chordata
Subphylum Vertebrata
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Superclass Gnathostoma
 Class Amphibia
○ Tetrapods with nonamniotic egg
○ Nonscaly
○ 3-chambered heart
○ ectothermic
Transitions to Land
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Reproduction on Land
Phylum Chordata
Subphylum Vertebrata
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Superclass Gnathostoma
 Class Reptilia
○ Tetrapods with amniotic egg
○ Scaly skin
○ Ectothermic
○ 3 chambered heart
Phylum Chordata
Subphylum Vertebrata
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Superclass Gnathostoma
 Class Aves (now included in Reptilia)
○ Tetrapods
○ Feathers
○ Bipedal with wings
○ Endothermic
○ 4 chambered heart
Phylum Chordata
Subphylum Vertebrata
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Superclass Gnathostoma
 Class Mammalia
○ Tetrapods
○ Hair
○ Mammary glands
○ Endothermic
○ Give birth to live young
 Marsupials
 Placental mammals
○ 4 chambered heart
Phylum Chordata
Subphylum Cephlachordata
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Animal:
Symmetry:
Body Cavity:
Digestion:
Circulation:
Segmentation:
Appendages:
Nervous:
Habitat:
Respiration:
Excretion:
Locomotion:
Support:
Amphioxus
Bilateral
Coelomate – Deuterostome
complete
closed, complete
yes
none
dorsal brain and dorsal nerve cord
aquatic, buried in sand
skin surface
nephridia
tail, fin
notochord
Phylum Chordata
Subphylum Vertebrata
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Animal:
Symmetry:
Body Cavity:
Digestion:
Circulation:
Segmentation:
Appendages:
Nervous:
Habitat:
Respiration:
Excretion:
Locomotion:
Support:
Pig
Bilateral
Coelomate – Deuterostome
complete
closed, complete
yes
4 legs
dorsal brain and dorsal nerve cord
terrestrial
lungs
kidneys
legs
endoskeleton