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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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LABORATORIO: PROTOZOA

LABORATORIO

Phylum Echinodermata

EJERCICIO 16

Goals for todayLearn to recognized the Phylum Echinodermata from other animalsLearn the main diagnostic characteristics of the group.Learn about some species biologyPhylum EchinodermataKey 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 armorWater-vascular system that powers tiny tube feet for locomotion and food gatheringPedicellariae (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

Class Asteroidea-Sea startsCharacteristicshttp://www.youtube.com/watch?v=AdTLqoi2yLM

Body star-shaped with 5 or more armsArms relatively thick; not distinct from central body diskTube feet lie in open ambulacral groovesGonads and digestive tract extend into armsMadreporite (opening to water vascular system) and anus aboralMostly slow-moving predators

4Clase AsteroideaExercise 16A: Phylum: EchinodermataClase Asteroidea- sea startsAsterias

External Anatomy

Clase AsteroideaExercise 16A: Phylum: EchinodermataClase Asteroidea- sea startsAsterias

Internal Anatomy

7Class Holothuroidea-Sea cucumbersCharacteristicshttp://www.youtube.com/watch?v=aCxKFc3XtJs

Body elongated in oral-aboral axisSecondarily bilaterally symmetric (no dorsal tube feet)Skeleton reduced to isolated ossicles; soft-bodiedRing of tentacles around mouthMost are deposit feeders in soft sediments

8Clase HolothuroideaExercise 16D: Phylum: EchinodermataClase Holothuroidea- sea cucumbersCucumaria

External Anatomy

Clase AsteroideaInternal Anatomy

Exercise 16D: Phylum: EchinodermataClase Holothuroidea- sea cucumbersCucumaria

11

Class Ophiuroidea-Brittle starsCharacteristics

Five arms articulated; distinct from body diskArms may be branched (basket stars) or unbranched (brittle stars)Arms lack open ambulacral grooveLack anusMost are deposit or suspension feeders12Clase OphiuroideaExternal Anatomy

Exercise 16B: Phylum: EchinodermataClase Ophiuroidea- brittle starsVer material preservado

Class Echinoidea-sea urchinsCharacteristics

Body globular or disk-shaped; lack armsSkeletal plates fused into rigid testPores in test allow tube feet to exitSpines moveableProtrusible jaw apparatus (Aristotle's Lantern)Mostly herbivores or detritivores, but some predatoryhttp://www.youtube.com/watch?v=D3W4OCnHyCs14Clase EchinoideaExternal Anatomy

Exercise 16C: Phylum: EchinodermataClase Echinoidea- sea urchisVer material preservado

Clase EchinoideaExternal Anatomy

Exercise 16C: Phylum: EchinodermataClase Echinoidea- sea urchisVer material preservado

Larvas

Brachiolaria

Bipinnaria17