1 / 14

Insect Structure and Development

Insect Structure and Development. Insects and Diseases. External Anatomy. Insects & relatives have a lightweight, but strong exoskeleton – chitin, like fingernails Allows burrowing, tunneling Protection from predation Reduces water loss Greater muscle force

seamus
Download Presentation

Insect Structure and Development

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Insect Structure and Development Insects and Diseases

  2. External Anatomy • Insects & relatives have a lightweight, but strong exoskeleton – chitin, like fingernails • Allows burrowing, tunneling • Protection from predation • Reduces water loss • Greater muscle force • Cannot grow – must be shed: MOLTED

  3. Molting: shedding the exoskeleton • During molting process, insect is vulnerable • Often white – highly visible • Soft, easily crushed • Often hide, or molt at night • Usually stop feeding • After molt, exoskeleton is flexible • Inhales to increase size, allow growth

  4. External Sensory Organs • Insects can sense: • Light • Pressure • Sound • Temp • Wind • Odors

  5. Body is divided into 3 regions • Head • Food and sensory intake • One pair of antennae • One pair of compound eyes • 1 to 3 simple eyes • Information processing • Brain • Mouthparts – Key to ID of Damage; Control • Chewing • Sucking • Piercing

  6. Thorax (divided into 3 segments) • Structural support for 6 legs (one pair of legs on each thoracic segment) • Running • Grasping • Digging • Swimming • Structural support for wings • 1 or 2 pairs • Wings may be absent • Abdomen (divided into 11 segments) • Reproduction • Digestion • Circulation • Respiration

  7. Internal Anatomy • Internal systems are simple, yet functional • Circulatory • Simple heart and aorta • Blood flows freely within body cavity • Not oxygen carrying, green blood • Respiratory • Air enters through spiracles • Branching tubes distribute oxygen • Horticultural oils

  8. Digestive • Long, tubelike gut • divided into sections each with a different function • BT bacteria damages the gut

  9. Nervous • Transports and process info from sensory organs • Brain in head; other nerve centers • Phermone compounds confuse • Nerve toxins

  10. Reproductive • Most reproduction is sexual • Males may be rare or seasonal • Males may be absent (aphids) • Some wasp species • males from unfert. eggs • females from fert. eggs • Ovipary(eggs), vivipary (live birth) both common

  11. Virtual Insects

  12. The End

More Related