Home > Flashcards > Environmental Studies > ESPM 40 - Midterm 1

Details Title: ESPM 40 - Midterm 1 Description: Insects and Human Society Total Flash Cards: 22 Created: 10/22/2007 23:19:02	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term Phylum Arthropoda Definition 1. Bilaterally symmetrical 2. Segmented 3. Open Circulatory System 4. Exoskeleton 5. Ventral Nerve Cord 6. Dorsal Artery  Term Class: Trilobita  Definition fossil species only Term Chelicerata Definition spiders, scorpions, ticks, mites, etc. (named for mouthparts) Term Myriapoda Definition have head and many segments (centipedes, millipedes) Term Crustacea Definition (crabs, shrimp, pill bugs) 1. two pairs of antennae 2. Appendages on most segments (mostly aquatic)  Term Class: Hexapoda Definition Includes true insects Term Insecta Definition true insects; a) 1 pair of antennae b) 3 major body regions- Head, Thorax, Abdomen c) 3 pairs of walking legs d) most have wings  Term jointed exoskeleton Definition "inside out"; 1. Multilayered external shell that varies dynamically with time and location; 2. Outer layers of integument protects animal from water loss (wax, cement on outside) 3. Exocuticle and Endocutical are composed of microfibers of chitin surrounded by a matrix of protein that becomes rigid when scelrotization occurs.  Term tagmosis Definition grouping into a functional unit of segments, like the Head, Thorax, and Abdomen Term Sclerotization Definition protein molecules are linked together by quinone that makes the matrix of protein of chitin become rigid Term advantages of an exoskeleton   Definition a) efficient at small size b) tubular design is stronger than rod for less weight c) flexible enough and light enough for flight d) provides good protection for soft internal structures  Term limitation of exoskeleton Definition a) growth must occur in discrete steps; expansion to new size occurs immediately after molting b) size limiting factors and the surface area to volume problem  Term Head Definition sensory, ingestion, houses brain; 1. antennae, compound eyes, mouthparts  Term Thorax Definition 1. locomotion (legs, wings) 2. three segments (pro-,meso-,metathorax), wings on last two  Term Abdomen Definition houses digestive, excretory, reproductive organs; 9 to 11 segments Term Appendages Definition 1. typically jointed, many pairs, maybe as many as one pair per body segment 2. appendages that are modified into antennae, mouthparts, legs (NOT wings)  Term Mouthparts Definition labrum, mandibles, maxillae, labium; 1. various modifications of mouthparts illustrate how insects can vary the same basic plan to different, specialized structures 2.examples: grasshopper, sucking bug, mosquito, bee, butterfly  Term epicuticle Definition wax/cement outermost layer; protects against moisture loss Term exocuticle Definition relatively rigid; microfibers of chitin surrounded by a matrix of protein Term endocuticle Definition middle seciton of exocuticle; more flexible and surrounded by a matrix of chitin Term epidermis Definition living cells--secrete cuticle; innermost layer Term Definition