The document provides an overview of Asteroidea, commonly known as starfish, covering various aspects such as their anatomy, physiology, reproduction, and ecological impact. It highlights their unique features like pentameric radial symmetry, water vascular system, and modes of reproduction including both asexual and sexual methods. Additionally, it discusses their distribution, predation strategies, and the role they play as bioindicators in ecosystem health.

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ASTEROIDEA
UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE
CLASS: ZOOLOGY II

2. INTRODUCTION
Asteroidea
Starfish
Invertebrates
 Echinoderms
 Deuterostomes
 Pentameric radial
symmetry
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Asteroidea – Zoology II

3. PHYLOGENY– ECHINODERMATA INSIDE METAZOA
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Asteroidea – Zoology II

4. EMERGING PATTERNS
 Catch connective tissue
 Niche sharing
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Asteroidea – Zoology II

5. PHYLOGENY – ASTEROIDEA INSIDE ECHINODERMATA
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Asteroidea – Zoology II

6. ANATOMY – EXTERNAL
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 Size
 Between12 and 24 cm
in diameter
Asteroidea – Zoology II

7. ANATOMY – EXTERNAL
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 Number of arms
 Between 5 and 50
Asteroidea – Zoology II

8. ANATOMY – EXTERNAL
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 Shape of the arms
Asteroidea – Zoology II

9. ANATOMY – BODY WALL
 Epidermis
 Mono-ciliated, non-ciliated, mucous and
sensory cellls
 Dermis
 Catch connective tissue and ossicles
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Asteroidea – Zoology II

10. ANATOMY – BODY WALL
 Estructures
 1 - Spines
 2 - Paxillae
 3 - Pedicellariae
 4 - Papulae
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1 2
3
3
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Asteroidea – Zoology II

11. ANATOMY – INTERNAL
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4
2
3
1
Aboral surface view:
1 – Anus
2 – Pyloric stomach
3 – Pyloric caecum
4 – Cardiac stomach
Asteroidea – Zoology II

12. ANATOMY – INTERNAL
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2
3
1
5
4
6
7
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Aboral surface view:
1 – Madreporite
2 – Stone canal
3 – Ring canal
4 – Radial canal
5 – Lateral canal
6 – Ampulla
7 – Tube foot
8 – Polian vesicle
Asteroidea – Zoology II

13. PHYSIOLOGY – WATERVASCULAR SYSTEM
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VÍDEO
Asteroidea – Zoology II

14. PHYSIOLOGY – NUTRITION
 Cernivores
 Reef
 Plankton
 Extraoral digestion
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VÍDEO
Asteroidea – Zoology II

15. PHYSIOLOGY – NUTRITION
 Primary digestion is extracellular
 Pyloric caecum
 Intra and extracellular digestion
 Absorption
 Excretion 15
Asteroidea – Zoology II

16. PHYSIOLOGY – CIRCULATORY SYSTEM
 Coelomic circulation
 Water vascular system
 Perivisceral coelom
 Hyponeural system
 Perihemal system
 Genital system
 Ciliary action
 Excretion
 Diffusion
 Celomocytes
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Asteroidea – Zoology II

17.  Gas exchange
 Papulae
 Tube feet
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PHYSIOLOGY – CIRCULATORY SYSTEM
Asteroidea – Zoology II

18. PHYSIOLOGY – NERVOUS SYSTEM
 Associated to the epidermis
 Circum-oral nerve ring
 Radial nerve
 Ocelli
 Diffuse sensory cells 18
Asteroidea – Zoology II

19. PHYSIOLOGY – REGENERATION
 Arm + central disc
 Slow regeneration
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Asteroidea – Zoology II

20. REPRODUCTION AND LIFE CYCLE
 Asexual reproduction
 Central disc division
 Linckia
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Asteroidea – Zoology II

21. REPRODUCTION AND LIFE CYCLE
 Sexual reproduction
 Dioecious
 Gonads
 External fertilization
 Planktonic eggs and larvae
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Asteroidea – Zoology II

22. REPRODUCTION AND LIFE CYCLE
 Larval development
 Bipinnaria larva
 Brachiolaria larva
 Metamorphosis
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Asteroidea – Zoology II

23. REPRODUCTION AND LIFE CYCLE
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VÍDEO
Asteroidea – Zoology II

24. GROUPS
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1 2
3 4
5 6 7
1
2
3
7
4
5
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Asteroidea – Zoology II

25. ECOLOGY
 Distribution and habitat
 Strategies against predation
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Asteroidea – Zoology II

26. ECOLOGY
 Ecological impact
 Biodiversity
 Overpopulation
 Bioindicators
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Asteroidea – Zoology II

27. DOUBTS? 27

28. REFERENCES
 Invertebrate zoology, Rupert & Barnes, 6ª ed.
 http://.cronodon.com/BioTech/Asteroids.html
 http://.animaldiversity.ummz.umich.edu/accounts/Asteroidea
 http://animalbiology101.tumbler.com/echinodermata
 http://ucmp.berkley.edu/echinodermata/asteroidea.html
 http://tolweb.org/Asteroidea
 http://cifonauta.cebimar.usp.br/táxon/asteroidea
 http://en.wikipedia.org/wiki/Starfish 28