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LABORATORIO Phylum Echinodermata

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.

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LABORATORIO Phylum Echinodermata

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  1. LABORATORIOPhylum Echinodermata EJERCICIO 16

  2. 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

  3. Phylum Echinodermata Echinoderms are all marine organisms: sea starts, brittle starts, sea urchis, sand dollars and sea cucumbers Key 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 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 • Pentaradial symmetry: five o multiples of five- this is secondarily adquired, larvae is bilateral

  4. Class Asteroidea-Sea starts Characteristics • 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

  5. ClaseAsteroidea Exercise16A: • Phylum: Echinodermata • ClaseAsteroidea- sea starts • Asterias External Anatomy

  6. ClaseAsteroidea Exercise16A: • Phylum: Echinodermata • ClaseAsteroidea- sea starts • Asterias Internal Anatomy

  7. Class Holothuroidea-Sea cucumbers Characteristics • 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

  8. ClaseHolothuroidea Exercise16D: • Phylum: Echinodermata • ClaseHolothuroidea- sea cucumbers • Cucumaria External Anatomy

  9. ClaseAsteroidea Exercise 16D: • Phylum: Echinodermata • Clase Holothuroidea- sea cucumbers • Cucumaria Internal Anatomy

  10. Class Ophiuroidea-Brittle starts 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

  11. ClaseOphiuroidea Exercise 16B: • Phylum: Echinodermata • ClaseOphiuroidea- brittle starts • Ver material preservado External Anatomy

  12. Class Echinoidea-sea urchis 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

  13. ClaseEchinoidea Exercise 16C: • Phylum: Echinodermata • ClaseEchinoidea- sea urchis • Ver material preservado External Anatomy

  14. ClaseEchinoidea Exercise 16C: • Phylum: Echinodermata • ClaseEchinoidea- sea urchis • Ver material preservado External Anatomy

  15. Larvaes Brachiolaria Bipinnaria

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