Evolutionary Traits/Complexity Phylum Arthropoda -Organ Level or Organization -Segmentation -Bilateral Symmetry -Brain and well developed nervous system Nervous System and Cephalization -Exoskeleton and muscles Skeleton and Movement -Tube-within-a-tube body plan = complete digestive tract Digestion -Excretion through the anus Excretion -Malpighian tubules -Open Circulation -Trachae System or Book Lungs Respiration - Sexual (Internal or external fertilization) Reproduction Phylum Echinodermata (Seastars, Sand Dollars, Sea Urchins) -Echinodermata means ‘spiky skin’. -Echinoderms are unique in that they have a water vascular system that is involved in their movement, respiration and excretion. -Echinoderms are deuterostomes, like Chordates. This means that the blastopore, the first opening in the developing embryo, becomes the anus. Evolutionary Traits/Complexity Phylum Echinodermata -Organ Level or Organization -Segmentation -Bilateral (larvae) and radial (adults) Symmetry -Nerve ring Nervous System and Cephalization -No cephalization -Internal skeleton Skeleton and Movement -Water vascular system and tube feet -Stomach is pushed out in some species to digest prey Digestion -Excretion through the anus Excretion -Movement of water in water vascular system -Water vascular system Circulation -Water vascular system Respiration - Sexual (External fertilization) Reproduction
Evolutionary Traits/Complexity Phylum Arthropoda Level or Organization -Organ -Segmentation Symmetry -Bilateral Nervous System and Cephalization -Brain and well developed nervous system Skeleton and Movement -Exoskeleton and muscles Digestion -Tube-within-a-tube body plan = complete digestive tract Excretion -Excretion through the anus -Malpighian tubules Circulation -Open Respiration -Trachae System or Book Lungs Reproduction - Sexual (Internal or external fertilization) Phylum Echinodermata (Seastars, Sand Dollars, Sea Urchins) -Echinodermata means ‘spiky skin’. -Echinoderms are unique in that they have a water vascular system that is involved in their movement, respiration and excretion. -Echinoderms are deuterostomes, like Chordates. This means that the blastopore, the first opening in the developing embryo, becomes the anus. Evolutionary Traits/Complexity Phylum Echinodermata Level or Organization -Organ -Segmentation Symmetry -Bilateral (larvae) and radial (adults) Nervous System and Cephalization -Nerve ring -No cephalization Skeleton and Movement -Internal skeleton -Water vascular system and tube feet Digestion -Stomach is pushed out in some species to digest prey Excretion -Excretion through the anus -Movement of water in water vascular system Circulation -Water vascular system Respiration -Water vascular system Reproduction - Sexual (External fertilization)