Classification- Animals Biology Miss Schwippert
Annelids ( worms) • Transport: Moves using muscular contractions and grips with bristles called setae • Closed circulatory system. • Excretion: liquid waste is removed using the nephridia • Respiration: oxygen is diffused across its skin (so it must stay moist) • Nutrition: Heterotrophic decomposers; have a digestive system with mouth and anus • Sexual reproduction (most are hermaphrodites). After exchange of sperm, cocoon of eggs is laid in the soil. • Growth and Development: Hatch fully developed except for sex organs. Segments are added to the head end as they grow.
Most diverse and widely successful (1.3 million species) of any phyla. Exist in every environment. Their name means, “jointed appendage.”
Arthropods • Transport: closed circulatory system. Can walk, swim or fly. • Excretion: most use malpighian tubules • Respiration: Oxygen is absorbed through openings called spiracles which lead to trachea. The trachea pass oxygen to tissues. If aquatic, use gills • Nutrition: Heterotrophic with a closed digestive system with saliva, enzymes, mouth and anus • Reproduction: Sexual reproduction • Growth and Development: Eggs hatch into larvae/pupae then becoming adults (metamorphosis). Growth is accomplished through life by molting the exoskeleton.
III. Fish: Group of Chordates that contains both fresh and marine species (26,000 or more). All have a spinal cord, gills, and internal skeleton of bone or cartilage.
Fish • Transport: Cold blooded with a closed circulatory system. Oxygen is absorbed through gills. • Excretion: waste excreted via urine (ammonia) and fecal matter. Salt water fish conserve water as much as possible. • Respiration: Gills of a fish contain many blood vessels that absorb oxygen from the water. Lots of surface area. • Nutrition: Heterotrophic • Reproduction: Sexual: most lay eggs BUT some do give live birth. • Growth and Development: Born as immature alevin. Grow slowly throughout life.
Amphibians • Transport: Closed digestive system with mouth, stomach, intestines, and cloaca; Closed circulatory system with a chambered heart to transport blood, oxygen and carbon dioxide. • Excretion: kidneys and bladder to filter blood; waste leaves through cloaca. • Respiration: Gas exchange via skin and as adults they also use lungs. This is one reason why they must stay moist. • Nutrition: heterotrophic • Reproduction: Sexual. Most lay eggs in or near water. • Growth and Development: hatch from eggs as larvae and then undergo metamorphosis until adult stage.
IV. Mammals Chordates with hair, milk produced by female and endothermic ability using sweat glands and fatty layer. Mammals also have highly developed brains.
Animals • Transport: 4 chambered heart with extensive network of veins, arteries, and capillaries (due to our relatively large size).
Animals • Excretion: Kidneys filter blood and remove waste; urine and fecal matter is excreted via urethra/anus. • Respiration: Gas is exchanged in the lungs using diffusion and pressure. Lungs are fed by capillaries which carry blood to/from the heart. • Nutrition: Heterotrophic; young drink milk from mammary glands in the female. • Reproduction: • Mammals reproduce using internal fertilization with eggs and sperm, but there are 3 groups of mammals: • Monotremes: lay eggs • Marsupials: live birth with pouched care • Placental: internal development with nutrients exchanged with a placenta