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Echinodermata Chordata

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1 Echinodermata Chordata
The Deuterostomes Echinodermata Chordata

2 Quiz (Champaca) What is the most distinctive structure of echinoderms?
What are these structures that operate like suction cups (and are found at the end of the radial canals)? From what words did "echinodermata"  come from? Give the words and their meanings. In what form are nitrogen-containing cellular wastes released? Give one class under echinodermata and one example(common name/scientific name).  Bonus: Answer only one. Give an echinoderm found in the Philippines.  (1 point) Give the scientific names of 2 echinoderms. (1 point, 0.5 each)

3 Parazoa no true tissues
Radiata Bilateria Eumetazoa Parazoa no true tissues Multicellularity

4 type of digestive system
Common Features Features Echinodermata Chordata # of germ layers triploblasts type of symmetry bilaterally-symmetric larvae body cavity coelom present fate of blastopore anus develops first type of digestive system complete digestive system

5 Distinguishing features
Echinodermata Chordata Etymology echino + dermis “spiny skin” chorda “chord” General description spiny-skinned marine animals, water-vascular system, endoskeleton, and pentaradial symmetry (adults) animals with a notochord, hollow dorsal nerve cord, pharyngeal pouches, and a post-anal tail # of species ~6,000 sp. ~60,000 sp.

6 ECHINODERM BODY PLAN bilaterally-symmetric larvae
pentaradially-symmetric adults water vascular system for respiration, circulation, movement CaCO3 endoskeleton oral and aboral sides

7 diffusion through tube feet and the water vascular system
Phylum Echinodermata Feeding herbivores, carnivores, filter feeders, detritivores food enters water vascular system through the mouth and waste exits through the anus Respiration diffusion through tube feet and the water vascular system Circulation water vascular system Excretion metabolic waste exits through tube feet and skin gills Response simple nervous system: nerve ring, radial nerves, sensory cells Movement tube feet + muscle fibers attached to endoskeleton Endoskeleton may have movable spines/joints Reproduction external fertilization separate sexes bilaterally-symmetric larvae

8 Phylum Echinodermata Asteroidea sea stars (Acanthaster) Ophiuroidea
brittle stars Echinoidea sand dollars and sea urchins (Diadema) Crinoidea sea lilies and feather stars

9 notochord – flexible rod between the nerve cord and digestive tract
hollow dorsal nerve cord pharyngeal slits or pouches connecting inside of throat to outside of neck (functioned first as filter-feeding devices) post-anal tail internal segmentation CHORDATA BODY PLAN

10 Phylum Chordata Feeding herbivores, carnivores, filter feeders, detritivores, parasites complete digestive system Respiration aquatic: gills aided by diffusion through moist skin terrestrial: lungs Circulation Closed circulatory system, may maintain internal body temperature (endotherm) or depend on the environment (ectotherm) Excretion Glands and kidneys Response Centralized and cephalized nervous system with sensory organs, a brain, and a dorsal nerve cord Movement Muscles attached to an endoskeleton Usually with four appendages Reproduction Sexual reproduction External or internal fertilization Often have separate sexes

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