Superphylum Deuterostomia | Invertebrates | Unit 5. Biological Diversity
Chapter: Superphylum Deuterostomia
Collection: Invertebrates
Unit 5. Biological Diversity
Book: Biology
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Echinoderms are deuterostomic marine organisms. This phylum of animals bears a calcareous endoskeleton composed of ossicles. These animals also have spiny skin. Echinoderms possess water-based circulatory systems. A pore termed the madreporite is the point of entry and exit for water into the water vascular system. Osmoregulation is carried out by specialized cells known as podocytes. The characteristic features of Chordata are a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. Chordata contains two clades of invertebrates: Urochordata (tunicates) and Cephalochordata (lancelets), together with the vertebrates in Vertebrata. Most tunicates live on the ocean floor and are suspension feeders. Lancelets are suspension feeders that feed on phytoplankton and other microorganisms.
00:00 Superphylum Deuterostomia
01:49 Phylum echinodermata
02:26 Morphology and anatomy
03:23 Water vascular system
04:38 Nervous system
04:57 Excretory system
05:14 Reproduction
05:38 Classes of echinoderms
08:03 Phylum chordata
08:49 Section summary
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