laboratorio phylum echinodermata

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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 (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 developPentaradial symmetry: five o multiples of five- this is secondarily adquired, larvae is bilateral

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

Class Asteroidea-Sea startsCharacteristics

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

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

External Anatomy

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

Internal Anatomy

Class Holothuroidea-Sea cucumbersCharacteristics

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

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

External Anatomy

Clase AsteroideaInternal Anatomy

Exercise 16D: Phylum: EchinodermataClase Holothuroidea- sea cucumbersCucumaria

Class Ophiuroidea-Brittle startsCharacteristics

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 feedersClase OphiuroideaExternal Anatomy

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

Class Echinoidea-sea urchisCharacteristics

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 predatoryClase EchinoideaExternal Anatomy

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

Clase EchinoideaExternal Anatomy

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

Larvaes

Brachiolaria

Bipinnaria