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Question Introduction How Do You Insect Orders Objectives After you have completed this unit you should know for each order: • its common name, order name, and meaning of the order name • its development or metamorphosis • 3-4 facts regarding its life history and/or economic importance • its wing type, leg types and mouth adaptations 1 2 Question Introduction How do you. Bees and Beetles tell the difference. • Six legs • Exoskeleton • Two antennae scarab beetle • Four wings 3 4 honey bees . .between a beetle and a bee? Classification Review Classification Review Diagram Kingdom Class Order Family Genus Species Dung Beetle: Insecta, the order Coleoptera and the family Scarabaeidae. Honey Bee:Insecta, the order Hymenoptera, and the family Apidae. 5 6 1 Review Terms Review Terms: Answers See how many of these terms you know by writing their Anamorphic: Development in some Ametabolous definitions on a piece of paper. parainsects where abdominal segments are added during the molting process. egg juvenile adult These terms will help you throughout the unit and on Ametabolous: An insect that undergoes Hemimetabolous your lab projects. slight or no metamorphosis. The young look just like the adult. They also keep molting even after becoming an adult, something the egg 1. Anamorphic: other kinds of insects don't do. juvenile 2. Ametabolous: Hemimetabolous: An insect that adult 3. Hemimetabolous: undergoes incomplete metamorphosis. Holometabolous 4. Holometabolous: The young look very similar to the adult. egg 5. Apterygote: larva 6. Paleopterous: Holometabolous: An insect that pupa adult undergoes complete metamorphosis. 7. Pterygote: This type of metamorphosis includes 8. Neoptera: Cuckoo wasp 7 the egg stage, larval stage, pupal stage and 8 9. Exopterygote: adult stage. 10. Endopterygote: Review Terms Answers (Continued) Hexapoda Apterygote: An insect that doesn't have wings. Paleopterous: Insects having wings, but the wings cannot fold back over the insect's abdomen. All six-legged arthropods, hexapods, were once classified in Pterygote: This term refers to all winged insects. the Class Insecta. After some debate, some scientists group Neoptera: Having wings, but the wings have a flexon, or hinge, that allows the hexapods into three classes, Parainsecta, Entognatha, and wing to be folded back over the abdomen. Insecta and some scientists split them into four classes, Protura, Collembola, Diplura and Insecta. Each of the Exopterygote: Insects with wings that develop from structures called wing pads located on the outside of the growing insect. classification schemes are based on certain similarities between the groups. We will take a look at two cladograms Endopterygote: Insects with wings that develop from internal wing pads that show the differing opinions of how these organisms should present in the larvae. be classified. 9 Note: Because the parainsects are so closely related to the insects, we still 10 consider them insects in the non-technical sense of the term and encourage you to include them in your insect collection. vespid wasp Four Class Scheme Three Class Scheme These lines indicate relatedness. It is like a family tree. Gullen and Cranston, 2010, Figure 7.2 Daly et. al, 1998, pg.306-307 In this cladogram, the proturans, collembolans, diplurans and insects are all considered to be separate classes. We will study each of these groups individually, but here, you can 11 12 follow the lines to see how the classes are all related. Early woodcut of the first published illustrations of Protura (Berlese 1907). 2 Objectives Recap Insect Taxonomy 28 insect orders. You will learn about each of the more common orders in the lecture and readings and will complete the chart on your study guide. 1. its common name 2. its development, or metamorphosis 3. 2-3 facts regarding its life history and/or economic importance 4. any special adaptations of mouthparts, legs, or wings 5. the meaning of the order name thrips 13 14 Gullen and Cranston, 2010, Figure 7.2 Class Parainsecta: Order Protura Proturan Walking Video • Eyeless first tail • Lack antennae • Small (<2mm) • anamorphic development • Enlarged forelegs (sensory organs) • Lack tentoria and cerci • 5 segmented legs • nymphs begin with nine segments, but an adult have twelve • Feed on fungi and vegetable matter • called coneheads Proturan life stages. P=prelarva, L1=larva I, proturan LII=larva II, A=adult 15 16 Notice the meaning of the order name in the top right corner. Proturan Defensive Posture Video Class Parainsecta: Order Collembola glue wedge Springtails can tuck their tail (furcula) underneath and snap it back out, "springing" them off of the ground. • anamorphic development • 1 pair of antennae • no compound eyes • soil dwelling arthropod • scavenger • collophore (for water management – once thought to have glue – thus the name) collembolan • Furcula – jumping organ 17 18 Fill out the table on your study guide under the heading "Insect Orders." 3 Class Entognatha: Order Diplura Class Insecta: Subclass Apterygota two tail Order Archaeognatha Entognathans are a group that have enclosed mandibles. • Bristletails • Mostly nocturnal • soil arthropods • 350 known species • Predators feeding on mites, insects, collembolans,etc. ancient jaw • 700+ described species • Common in leaf litter • eyeless • Scavengers/herbivores : feed on algae, lichens and vegetation • 1 pair of antennae • Wingless • Sclerotized forcepts on the abdominal tip (cerci) • Primative jaw arrangement • 0.5-50mm • Continual molting (ametabolous) • 10 body segments • Continued molting • Female picks up sperm packet for each egg clutch • Cerci shorter than medial caudal filament http://www.earthlife.net/insects/diplura.html Watch Dr. Yanoviak from the University of Arkansas Little Rock as he describes the dipluran 19 unique gliding behavior of this primitive insect. 20 http://www.youtube.com/watch?v=tsNZtVfWUOk&feature=related Notice that the ending -ura means tail. Class Insecta: Subclass Apterygota: Primitive Pterygotes Order Zygentoma (Thysanura) Daly et. al, 1998, pg 306-307 bristle tail . include silverfish and firebrats . ametabolous development • some species live more than 6 years and can molt more than 60 times. wingless . covered in silver scales . compound eyes . three caudal filaments . Indirect fertilization . males leave sperm packets . occasional invaders of homes silverfish . prefer moist environments 21 Gullen and Cranston, 2010, Figure 7.2 22 Paleoptera – “ancient wings” (cannot fold wings) toothed ones Class Insecta: Subclass Pterygota: Class Insecta: Subclass Pterygota: Order Ephemeroptera (Mayflies) Order Odonata (Damselflies, ephemera - short-lived . Aquatic Dragonflies) . Herbivores The gills on the damselfly larvae are articulated and . Indicators of water quality easily break off when the animal is disturbed. Naiads have gills and caudal filaments . Subimago stage • only insects to molt once they have wings . Triangular wings mayfly . Adults (imago) emerge, mate, lay eggs, and expire Naiad jaw . Vestigial mouthparts as adults (do We are now entering the division not feed) of the winged insects. Notice that the name often ends in -ptera which means wing. 23 24 Note: a naiad is an aquatic nymph of a hemimetabolous insect. Can you tell which is which? Remember, the damselfly naiad has external gills. 4 Order Odonata (Damselflies, Dragonflies) (continued) Neopteran Phylogeny toothed ones dragonfly 25 26 compound eyes damselfly Gullen and Cranston, 2010, Figure 7.2 Infraclass Neoptera: Division Exopterygota Order Plecoptera: (stoneflies) folded wing Wing pads Daly et. al, 1998, pg 306 • Hemimetabolous • Filiform antennae • Flat appearance • Require clean, moving water predatory hemipterans Adult stonefly Note: These wing pads are an indication that the insect has not developed into 27 The adults emerge at the same time and live for 28 the adult stage. This is a tip you can use while you are out collecting your only a few weeks. insects. Order Dermaptera (earwigs) Embioptera (webspinners) skin wing Lively wings • front legs with silk producing glands • Hemimetaolous • beaded antennae • hemimetabolous • short elytra with fan-shaped flight • filiform antennae wings • adult males are winged • nocturnal • found under tree bark • scavengers • herbivores • pincer-like cerci • build tunnels of silk • females protect eggs and young earwig (sub-social) • enlarged hind legs to move backwards • live in groups 29 30 Myth: Earwigs were once thought to enter the ear and burrow into the skin of sleeping individuals. 5 Zoraptera (angel insects) Order Orthoptera (grasshoppers, crickets, katydids) Pure without wings You can tell that you have now entered the section of neopterous insects. As you can see, the wings are folded on top of each other over the • Rare and not well understood abdomen and are not held out to the side or straight back. • Some are winged • Small >4mm • Moniliform antennae straight wing • Found in rotting wood or in sawdust Cricket 31 32 A mole cricket with A large lubber grasshopper fossorial front legs. with coloring that tells predators it's nasty to eat. Order Phasmatodea (Walking sticks) Grylloblattodea (Rockcrawlers) • hemimetabolous • chewing mouthparts • found on mountaintops and in caves at low temperatures • eggs are dropped to the ground from • hemimetabolous the trees • filiform antennae • long slender antennae From the Greek “phasm” or phantom • only 25 species worldwide • reduced (brachypterous) wings • slow development (7 years per generation) • Defensive secretion from thorax • Can regenerate legs • longest
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