Bio Lecture 20: Invertebrates 2
Bio Lecture 20: Invertebrates 2 BIO 209L-001
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This 3 page Class Notes was uploaded by Kiara Reyes on Monday October 19, 2015. The Class Notes belongs to BIO 209L-001 at Northern Illinois University taught by Dr. Renee Kopulos in Summer 2015. Since its upload, it has received 35 views. For similar materials see Human Anatomy and Physiology I Lab - SL in Biological Sciences at Northern Illinois University.
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Date Created: 10/19/15
Lecture 20 Invertebrates 2 1 Nematodes aka round worms Human Parasites 0 Extremely abundant and widespread living in Oceans fresh water habitats soil Inside plants and inside animals 0 Not Segmented In nature important part of food webs by decomposing organic material and cycling nutrients Eeeding of plantsorganisms from dead or alive 0 In agriculture some nematodes are harmful and some bene cial Entomopathogenic quotinsect disease causing nematodes attack plant eating insects help crops Root nematodes attack plant roots harming crops feeding off nutrients affecting growing systems 0 Most common parasitic one in US in Pinworms 1 Eggs ingested or breathed in 2 Eggs hatched and adults developed in intestines 3 Females exit out anus to lay eggs at nightl Eggs on Body and Bed clothes Nonfatal but causes irritation Most common in temperate climates 2 Arthropods Characteristics 1 Toughhard exoskeleton grows around them and protecting composed large of chitin seen in fungiinsects Restricts prevent growth so arthropods molt shed 2 Arth Jointed PodEootAppernage 3 Segmented appendages preform a wide variety of functions Different types of appendages develop from different segments controlled by homeotic gene kinda like IIOX gene 0 Antennae sensory receptionMouthparts feeding o Pincer defense or claws Walking legs 0 Swimming appendages 1 pair per abdominal segments tail 4 Many terrestrial arthropods breath through quotbranching air tubes via opening lateral abdomen thorax tracheal system branching air tubes Many aquatic species have gills water moves over feather structure with large surface area allowing gas exchange Oxygen in Carbon Monoxide out Groups of Arthropods Phylum Arthropods 1 2 3 Arachnids chelicerates spiders 2 main body parts Ex Daddy Long Legs Scorpions Dust Mites Deadly Spiders Black Widow female and Brown Reduce Characteristics of Spiders 6 pairs segmented appendages 4 pairs of walking legs 1 pair as foodmanipulators and sperm transfer 1 pair Chelicerae injecting venom and digesting enzymes Crustaceans Lobsters Shrimp Crayfish Crabs Pillbug quotroly poly Isopod Insecta largest Class Adult Characteristics 1 pair antennae feelers smellers 3 pairs of Thoracic walking legs 2 paris of wings usually 2 compound eyes multiacted little light detectors in between 0 Most Insects undergo Complete Metamorphosis Changes into their body form Larva wormlike with internal wings Development Egggt Larva moltsgt Larvagt Pupa popoutgt Adult Ex Silkworm 0 Some insects species undergo Incomplete Metamorphosis Larva Mini Adult but with wing quotpadquot can t y gtexternal wing development gtNo pupa stage gt Start small then grow to adults small adult version gtDoesn t have total body rearrangement Development Egggt Larvagt Bigger nymphgt Adult Ex Grasshopper 0 Others Centipedes carnivores Flattened with venom and claws Millipedes herbivores Cylindrical mostly scavengers 3 Echinoderms Deuterostomes o Indeterminate Cleavage Early embryo cells can each form a complete organism o Gastrulation Form o In gastrulation rst forming is Anus and second is Mouth 0 Ex Sea Stars Sea Cucumbers Sea Urchins Sand dollars Sea Lilies Characteristics 1 Live at the bottom of the ocean Many attached or sedentary 2 Larvae have bilateral symmetry even if adults don t appear to 3 No Cephalization no head 4 Can regenerate body parts that are lost as long as they have the middle part 5 Water Vascular System Use sea water instead of blood for gas exchange Oxygen in Carbon Monoxide out