laboratorio phylum echinodermata

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LABORATORIO Phylum Echinodermata EJERCICIO 16

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LABORATORIO Phylum Echinodermata. EJERCICIO 16. Goals for today. Learn to recognized the Phylum Echinodermata from other animals Learn the main ‘ diagnostic ’ characteristics of the group. Learn about some species biology. P hylum Echinodermata. - PowerPoint PPT Presentation

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Page 1: LABORATORIO Phylum Echinodermata

LABORATORIO

Phylum Echinodermata

EJERCICIO 16

Page 2: LABORATORIO Phylum Echinodermata

Goals for today

• Learn to recognized the Phylum Echinodermata from other animals

• Learn the main ‘diagnostic’ characteristics of the group.

• Learn about some species biology

Page 3: LABORATORIO Phylum Echinodermata

Phylum Echinodermata

Key characteristics of the Phylum:•Abandoned bilateral symmetry to become radial •Pentaradial symmetry: five o multiples of five- this is secondarily acquired, (just larvae is bilateral) •Deuterostomates (as Hemichordata and Chordata)•Dermal endoskeleton of calcareous plates and spines often fused like an armor•Water-vascular system that powers tiny tube feet for locomotion and food gathering•Pedicellariae (pincerlike structures)•Dermal branchiae (skin gills)•Lack a defined head: nervous and sensorial system poorly develop

Echinoderms are all marine organisms: sea starts, brittle starts, sea urchins, sand dollars and sea cucumbers

Page 4: LABORATORIO Phylum Echinodermata

Class Asteroidea-Sea starts

Characteristics• http://www.youtube.com/watch?v=Ad

TLqoi2yLM

• Body star-shaped with 5 or more arms• Arms relatively thick; not distinct from

central body disk• Tube feet lie in open ambulacral

grooves• Gonads and digestive tract extend into

arms• Madreporite (opening to water vascular

system) and anus aboral• Mostly slow-moving predators

Page 5: LABORATORIO Phylum Echinodermata

Clase AsteroideaExercise 16A:

– Phylum: Echinodermata• Clase Asteroidea- sea starts

• Asterias

External Anatomy

Page 6: LABORATORIO Phylum Echinodermata

Clase AsteroideaExercise 16A:

– Phylum: Echinodermata• Clase Asteroidea- sea starts

• Asterias

Internal Anatomy

Page 7: LABORATORIO Phylum Echinodermata
Page 8: LABORATORIO Phylum Echinodermata

Class Holothuroidea-Sea cucumbers

Characteristicshttp://www.youtube.com/watch?v=aCxKFc3XtJs

• Body elongated in oral-aboral axis• Secondarily bilaterally symmetric (no

dorsal tube feet)• Skeleton reduced to isolated

ossicles; soft-bodied• Ring of tentacles around mouth• Most are deposit feeders in soft

sediments

Page 9: LABORATORIO Phylum Echinodermata

Clase HolothuroideaExercise 16D:

– Phylum: Echinodermata• Clase Holothuroidea- sea cucumbers

• Cucumaria

External Anatomy

Page 10: LABORATORIO Phylum Echinodermata

Clase Asteroidea

Internal Anatomy

Exercise 16D: – Phylum: Echinodermata

• Clase Holothuroidea- sea cucumbers• Cucumaria

Page 11: LABORATORIO Phylum Echinodermata
Page 12: LABORATORIO Phylum Echinodermata

Class Ophiuroidea-Brittle stars

Characteristics

• Five arms articulated; distinct from body disk• Arms may be branched (basket stars) or

unbranched (brittle stars)• Arms lack open ambulacral groove• Lack anus• Most are deposit or suspension feeders

Page 13: LABORATORIO Phylum Echinodermata

Clase Ophiuroidea

External Anatomy

Exercise 16B: – Phylum: Echinodermata

• Clase Ophiuroidea- brittle stars• Ver material preservado

Page 14: LABORATORIO Phylum Echinodermata

Class Echinoidea-sea urchins

Characteristics

• Body globular or disk-shaped; lack arms• Skeletal plates fused into rigid test• Pores in test allow tube feet to exit• Spines moveable• Protrusible jaw apparatus (Aristotle's Lantern)• Mostly herbivores or detritivores, but some predatory

http://www.youtube.com/watch?v=D3W4OCnHyCs

Page 15: LABORATORIO Phylum Echinodermata

Clase Echinoidea

External Anatomy

Exercise 16C: – Phylum: Echinodermata

• Clase Echinoidea- sea urchis• Ver material preservado

Page 16: LABORATORIO Phylum Echinodermata

Clase Echinoidea

External Anatomy

Exercise 16C: – Phylum: Echinodermata

• Clase Echinoidea- sea urchis• Ver material preservado

Page 17: LABORATORIO Phylum Echinodermata

Larvas

BrachiolariaBipinnaria