7/2 day 3 notes on metamorphosis

COMPLETE SYLLABUS QUIZ

Chapter 2 of textbook lecture objectives

Types of metamorphosis

  • Ametabolous (a=without) without change) NEVER GET WINGS silverfish + springtails

  • Hemimetabolous (incomplete =hemisphere) egg nymph/naiads adult

    • Adults have wings

    • Naiad is an aquatic nymph

    • The stage between each molt is called an instar

    • The time between a molt is called the stadium

    • Spiracles are holes they breath from

    • Wing buds on nymphs

  • Holometabolous (holo = whole)(complete) egg larva pupa adult

    • The larva are designed to feed and are essentially a long digestive track

Terms are on pg 15

Ecdysis - getting out

Why insects cannot be large

  • They are/like hollow tubes

  • Eny3005 goes into biological processes in ore depth

All arthropods and cold blooded. (POIKILOTHERMS)

  • No internal temp regulation

  • Take temp from environment

  • Development, reproduction, and activity are functions of ambient temperature

  • They can shiver to build up heat

  • It can be an indicator of climate change

  • Warmer = more active

Invertebrates

  • No internal skeleton

  • Exo = outside

  • Chitin: sugar and proteins that are sturdy and lightweight

Exoskeleton

  1. Protection fro abrasion and injury

  2. Muscle attachment

  3. Waterproof (waxy layer)

  4. hollow

  5. Jointed

  6. Flexible (Wings)

How does an exoskeleton grow?

  • brain hormone, ecdysone, apolysis (ch2 quick change artistry)

  • Entire cycle runs on hormone cues. No central nervous system.

RANDOM

Dragonflies and damselflies

Damselflies have external gills

Dragonflies have internal gills and breath in trough anus

Caterpillars make silk from mouth

Stemmata simple eyes

Siphoning mouthpart when butterfly chewing when caterpillar