Backyard Insects Updated Edition
By Paul Horne and Denis Crawford
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About this ebook
From aphids to flies, ladybirds to wasps, insects of all shapes and sizes share our homes and gardens. Now in updated edition, the bestselling Backyard Insects explores the secrets and habits of more than one hundred little critters that are common to backyard Australia. Crawling with full-colour, larger-than-life photographs for easy identification, Backyard Insects is an indispensable guide for nature lovers, gardeners and kids of all ages.
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Book preview
Backyard Insects Updated Edition - Paul Horne
The Miegunyah Press
The gener al series of the Miegunyah Volumes was made possible by the Miegunyah Fund established by bequests under the wills of Sir Russell and Lady Grimwade.
‘Miegunyah’ was the home of Mab and Russell Grimwade from 1911 to 1955.
Backyard Insects
[updated edition]
by Paul Horne and Denis Crawford
THE MIEGUNYAH PRESS
An imprint of Melbourne University Publishing Limited
11–15 Argyle Place South, Carlton, Victoria 3053, Australia
www.mup.com.au
First published 1996
Second edition 2005
Reprinted 2006
This edition published 2015
Text © Paul Horne 2015
Photographs © Denis Crawford – Graphic Science 2015
Design and typography © Melbourne University Publishing Ltd 2015
This book is copyright. Apart from any use permitted under the Copyright Act 1968 and subsequent amendments, no part may be reproduced, stored in a retrieval system or transmitted by any means or process whatsoever without the prior written permission of the publishers.
Designed by Sandra Nobes
Typeset in ITC Stone Informal by Sandra Nobes
Printed in China through 1010 Printing Asia Limited
National Library of Australia Cataloguing-in-Publication entry
Horne, Paul A. (Paul Anthony), 1956–.
Backyard insects.
New ed.
Bibliography.
Includes index.
9780522869101 (pbk)
9780522869620 (ebook)
1. Insects. 2. Insects – Identification. I. Crawford.
Denis J. (Denis Julian), 1957–. II. Title
contents
Acknowledgements
Introduction
COMMON BACKYARD INSECTS
True bugs
Beetles
Flies
Butterflies, skippers and moths
Bees, wasps, ants and sawflies
THE INSECTS
Silverfish
Dragonfly and damselfly
Cockroaches
Termites
Mantid
Earwigs
Katydid and crickets
Locust and grasshopper
Stick insect
Psocids
Lice
True bugs
Treehoppers
Thrips
Lacewings
Antlion
Beetles
Flea
Flies
Butterflies
Skipper
Moths
Bees
Wasps
Ants
Sawflies
NON-INSECTS
Springtails
Spiders
Scorpions
Mites
Slaters
Slugs
Millipedes and centipedes
Land hoppers
Appendix 1: Collecting insects
Appendix 2: Photographing insects
Glossary
Further reading
Index
acknowledgements
IN THE PREPARATION OF THIS third edition we acknowledge the help and support of family and friends. In particular we thank: Claire, James and Janet Horne, and Jenny Keir and Jessica Page. We would also like to thank Melbourne University Publishing.
introduction
IN EVERY HOUSE and garden in Australia there are many species of insects. A few, such as clothes moths, blowflies, mosquitoes and aphids, are unwanted guests because of the damage they cause or the nuisance they create. As these are the insects that we may have most contact with, the impression that many people have is that almost all insects are pests. This is definitely not the case, as the number of pests are vastly outnumbered by species that are beneficial or that have no obvious direct impact on our lives. Some insects are directly helpful, for example, by killing pests or pollinating plants, whereas others are indirectly helpful by contributing to other processes, for example, as food for others, or by decomposing or recycling plant material.
There are many types of insects, but how do you recognise them? Some insect specialists (taxonomists) describe and define what makes one species different from another. Closely related species are sometimes easily distinguished from one another, but more often they are only distinguishable by minute differences that can be seen only with a microscope and a trained eye. This book is not written for the specialist but for anyone who wants to know a little more about the insects that share our homes and gardens.
Many books about insects begin by stating how numerous and diverse insects are, because this is one of their most striking aspects. How many insects are there in Australia? One recent estimate is that there are more than 85,000 species. This compares to about 250 mammals and more than 750 species of birds. Even if only a small fraction of all Australian insects exist in and around one city, it would be an enormous task to catalogue the species we find in that city’s gardens alone.
The intention of this book is to allow anyone to recognise some of the insects that commonly occur in the major urban areas of Australia, and to show some of the interesting aspects of insects. We have chosen some species as examples of the larger groups (orders and families) of insects so you will be able to see what makes one group different from another.
To help you identify your backyard insects, we have prepared full-colour photographs of more than one hundred species of insects plus a few non-insect species. These photographs should allow you to compare the insect in your backyard with the one in the book. If an insect is not exactly like the one in the book, but similar, then it probably belongs to the same group.
Most of us learn at school that insects have six legs and spiders have eight legs, but there are quite a few other types of animals that are often grouped together as ‘bugs’. Along with other animals (such as snails, shrimps, millipedes and worms) both insects and spiders are invertebrates: they do not possess a backbone or spine. Insects and spiders have jointed legs and, instead of an internal backbone, they have a hard skin that also functions as a supporting skeleton (an ‘exoskeleton’). Spiders are one of several non-insect species that are commonly found with insects, and often confused with them—we give examples of these towards the end of the book.
The insects are divided into groups (called orders) based on their physical appearance. Entomologists (people who study insects) in Australia generally recognise twenty-nine different orders, and these can be divided into primitive-wingless orders (two), primitive-winged orders (two) and modern-winged orders (twentyfive). Insects with primitive wings cannot fold them over their body. The modern-winged insects are further divided by how the immature insect develops. As with any rule, there are exceptions! Some of the modern-winged insects have no wings at all (fleas and lice) and some cannot fold their wings over their body (butterflies).
Among the modern-winged insects there are fourteen orders in which the young insects resemble the adults, such as the true bugs (Hemiptera). There are another eleven orders in which the mature insects are completely different in appearance from the adults and must pass through an intermediate stage, the pupa, to complete their development.
Some insect orders are either not found in Australia or not readily encountered, and we have not included any examples of these groups. We have omitted many aquatic insects so that we could include some that are more commonly encountered in the urban environment. We have chosen what we believe are some of the more interesting and commonly found species of insects, representing seventeen orders. These are:
•silverfish (Thysanura)
•dragonflies and damselflies (Odonata)
•cockroaches (Blattodea)
•praying mantids (Mantodea)
•earwigs (Dermaptera)
•crickets and grasshoppers (Orthoptera)
•stick insects (Phasmatodea)
•psocids or booklice (Psocoptera)
•lice (Phthiraptera)
•true bugs (Hemiptera)
•thrips (Thysanoptera)
•antlions and lacewings (Neuroptera)
•beetles (Coleoptera)
•fleas (Siphonaptera)
•flies (Diptera)
•butterflies, skippers and moths (Lepidoptera)
•bees, wasps, ants and sawflies (Hymenoptera)
We have also included some other common invertebrates that are often mistaken for insects, or thought of as insects, so that you can see the differences and recognise another few groups of animals.
For all insects illustrated in the book where possible we give the common name of the insect and its scientific name. The scientific name always consists of two parts, the Genus and then the species. For example, the common brown butterfly has the scientific name Heteronympha merope. The scientific name is used to avoid confusion: there may well be butterflies called ‘common brown’ in other parts of the world that are different species from the Australian ‘common brown’. The scientific name refers to only a single species. It is a useful way for scientists, in particular, to be sure that other scientists know precisely what species they are talking about. The common name, if one exists, is usually sufficient for people from the one area to know what insect is being discussed.
Similar species are grouped in a genus, similar genera are grouped in a ‘family’, and similar families make up an order. Entomologists also use a number of other intermediate categories in this hierarchy. The common brown butterfly, Heteronympha merope, belongs to the genus Heteronympha, the family Nymphalidae and the order Lepidoptera. You can recognise a family name as, by convention, it always ends in –idae, whereas a genus is printed in italics and begins with a capital letter. The species name is in italics without a capital letter. Where we have chosen an insect to illustrate a family or order we do not use its genus and species names.
The order in which each insect appears in the book is based on the taxonomic order of insects (with the more primitive insects first). For each insect described and illustrated we have set out at the top of the page the following details:
•common name
•scientific name
•the size of the pictured specimen (lengths vary depending on how well fed an individual is, but these lengths can be taken as average for that insect)
•the order and family it belongs to and, where appropriate, other details of its scientific classification.
This book contains general information about insects. We have deliberately tried to keep the use of specialist terms to a minimum, but a few are used in some descriptions. There is a glossary at the end of the book to help with any unfamiliar words. Backyard Insects will help you find out a little more about the insects in your immediate environment, and serve as an introduction for those who want to learn more. If you want further information on any of the insects discussed, refer to the further reading list at the end of the book. Information on collecting and photographing insects is also included in the appendices—these can be very enjoyable and rewarding activities for any insect lover.
In creating Backyard Insects, we have tried to produce a practical handbook that can be used easily by people in most urban areas of Australia. We hope that it helps you to get to know some of the insects that share your backyard.
THIS BOOK REPRESENTS eighteen orders of insects common to Australian backyards. However, of the 100 or so insects featured in these pages, the majority belong to only five orders—the Hemiptera (true bugs), Coleoptera (beetles), Diptera (flies), Lepidoptera (butterflies, skippers and moths) and Hymenoptera (bees, wasps, ants and sawflies). Most insects in your backyard will belong to one of these orders so their main characteristics and differences are explained here.
TRUE BUGS [Hemiptera]
MOST people call insects and other invertebrates ‘bugs’. It comes as a surprise and, we suspect, a disappointment when an entomologist tells them their specimen is a bug. Yet there is an order of insects, the Hemiptera, that are ‘true’ bugs.
The group is a very large one, including many commonly found species such as aphids, scale insects, cicadas and bed bugs. All species of true bugs feed by sucking, not chewing, and this is one of the characteristic features of the order. There are three major parts to the order, based largely on different wing structure and body form. Examples of the three groups are scale insects and aphids (have few veins in wings and are generally softbodied); leafhoppers and cicadas (have harder bodies and wings with many veins); and crusader bugs and assassin bugs (are hardbodied and have forewings with a toughened base).
There are more than 5,500 known Australian species of Hemiptera and more are certain to be found. There are many significant pest species, but there are many important beneficial species too.
Mating pairs of harlequin bugs walking around attached to each other are a common sight during summer in southern Australia. Some other bugs, such as bed bugs, have a much more bizarre method of mating. In these species the male punctures the body wall of the female, and the sperm he deposits migrate to the egg through her body fluid (haemocoele). This apparently brutal method of mating is successful but restricted to relatively few species!
BEETLES [Coleoptera]
IF success in the animal world is measured by how many species there are, then beetles are the most successful of all. There are more than 300,000 species, and about 30 per cent of all animal species in the world are beetles. A famous biologist once remarked that God must have had ‘a special preference for beetles’ as there are so many.
Entomologists estimate that there are about 30,000 species of beetles in Australia. Beetles have been able to inhabit almost every type of habitat from fresh water to dry land and some are even parasitic. One reason for their success is the way that they have modified