1

ASTEROIDEA

UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE

CLASS: ZOOLOGY II

INTRODUCTION

Asteroidea

Starfish

Invertebrates

Echinoderms

Deuterostomes

Pentameric radial

symmetry2

Asteroidea – Zoology II

PHYLOGENY– ECHINODERMATA INSIDE METAZOA

3

Asteroidea – Zoology II

EMERGING PATTERNS

Catch connective tissue

Niche sharing

4

Asteroidea – Zoology II

PHYLOGENY –ASTEROIDEA INSIDE ECHINODERMATA

5

Asteroidea – Zoology II

ANATOMY – EXTERNAL

6

Size

Between12 and 24 cm

in diameter

Asteroidea – Zoology II

ANATOMY – EXTERNAL

7

Number of arms

Between 5 and 50

Asteroidea – Zoology II

ANATOMY – EXTERNAL

8

Shape of the arms

Asteroidea – Zoology II

ANATOMY – BODY WALL

Epidermis

Mono-ciliated, non-ciliated, mucous and

sensory cellls

Dermis

Catch connective tissue and ossicles7

Asteroidea – Zoology II

ANATOMY – BODY WALL

Estructures

1 - Spines

2 - Paxillae

3 - Pedicellariae

4 - Papulae

8

1 2

33

4

Asteroidea – Zoology II

ANATOMY – INTERNAL

11

4

2

3

1

Aboral surface view:

1 –Anus

2 – Pyloric stomach

3 – Pyloric caecum

4 – Cardiac stomach

Asteroidea – Zoology II

ANATOMY – INTERNAL

12

2

3

1

54

6

7

8

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

PHYSIOLOGY –WATERVASCULAR SYSTEM

13

VÍDEO

Asteroidea – Zoology II

PHYSIOLOGY – NUTRITION

Cernivores

Reef

Plankton

Extraoral digestion

14

VÍDEO

Asteroidea – Zoology II

PHYSIOLOGY – NUTRITION

Primary digestion is extracellular

Pyloric caecum

Intra and extracellular digestion

Absorption

Excretion 15

Asteroidea – Zoology II

PHYSIOLOGY – CIRCULATORY SYSTEM

Coelomic circulation

Water vascular system

Perivisceral coelom

Hyponeural system

Perihemal system

Genital system

Ciliary action

Excretion

Diffusion

Celomocytes

16

Asteroidea – Zoology II

Gas exchange

Papulae

Tube feet

17

PHYSIOLOGY – CIRCULATORY SYSTEM

Asteroidea – Zoology II

PHYSIOLOGY – NERVOUS SYSTEM

Associated to the epidermis

Circum-oral nerve ring

Radial nerve

Ocelli

Diffuse sensory cells 18

Asteroidea – Zoology II

PHYSIOLOGY – REGENERATION

Arm + central disc

Slow regeneration

19

Asteroidea – Zoology II

REPRODUCTION AND LIFE CYCLE

Asexual reproduction

Central disc division

Linckia

20

Asteroidea – Zoology II

REPRODUCTION AND LIFE CYCLE

Sexual reproduction

Dioecious

Gonads

External fertilization

Planktonic eggs and larvae

21

Asteroidea – Zoology II

REPRODUCTION AND LIFE CYCLE

Larval development

Bipinnaria larva

Brachiolaria larva

Metamorphosis

22

Asteroidea – Zoology II

REPRODUCTION AND LIFE CYCLE

23

VÍDEO

Asteroidea – Zoology II

GROUPS

24

1 2

3 4

5 6 7

1

2

3

7

4

5

6

Asteroidea – Zoology II

ECOLOGY

Distribution and habitat

Strategies against predation

25

Asteroidea – Zoology II

ECOLOGY

Ecological impact

Biodiversity

Overpopulation

Bioindicators

26

Asteroidea – Zoology II

DOUBTS?27

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