Insects
By Michael Chinery and Bob Gibbons
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About this ebook
The ideal portable companion, the world-renowned Collins Gem series returns with a fresh new look and updated material.
This is the perfect pocket guide for nature enthusiasts keen to identify the most commonly seen insects in Britain and northern Europe.
Authoritative text and beautiful photographs show the distinguishing features of each insect to aid identification.
Features information on size, habitat, geographical range and months when they can be spotted, as well as names of similar species with which each insect could be confused, and details of the differences between them.
This new edition builds on the strengths of the unrivalled original, now expanded to include over 240 insects.
Michael Chinery
Michael Chinery is the UK’s leading writer on insects. His ‘Collins Field Guide to ‘Insects’ and ‘Collins Pocket Guide to ‘Insects’ are acknowledged as the best available.
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Insects - Michael Chinery
Introduction
The insects, with over a million known species, make up the largest of all animal classes. About 100,000 species live in Europe, some 20,000 of them in the British Isles. They occupy almost every habitat, including our homes, and feed on almost every organic material, from solid wood to blood and from nectar to dung. This ability to use almost anything as food has been a major factor in the insects’ success. Their small size has also played an important role, enabling them to colonise areas and use foods denied to larger animals.
Only a very small proportion of European insects can be illustrated in this book, but the species selected are mainly the common or conspicuous ones that are likely to come to your notice at home or when on holiday in different parts of Europe. Butterflies and moths are not included as they are covered in Collins Gem Butterflies & Moths Photoguide. Fleas, aphids and other tiny insects have also been omitted because they are not easy to identify without a microscope.
The Insect Body
An adult insect can be distinguished from other superficially similar creatures such as spiders and woodlice by its three main body regions – the head, thorax and abdomen – and its three pairs of legs. Most insects also have wings, which are not found in any of these other small animals. The head carries the mouth-parts, which vary according to the diet, the eyes, and a pair of antennae or feelers. The latter, varying from tiny bristles to large feather-like structures, are used for smelling and picking up tactile signals and sometimes for detecting sounds and heat.
A typical insect and detached leg, showing the main anatomical features
The pronotum is a tough plate covering the front part of the thorax. It is often quite small, but in grasshoppers, beetles and many bugs it forms a conspicuous shield. There may also be a prominent triangular plate called the scutellum at the rear of the thorax. The wings, when present, are always attached to the thorax. Most wings are membranous and supported on a network of veins, and the spaces between the veins are known as cells, but beetles and some other insects have tough, horny or leathery forewings, sometimes called elytra, that cover and protect the delicate hindwings. At rest, these insects do not look as if they have wings at all.
The legs are also attached to the thorax. They vary in shape according to the habits of the insects, but generally have four main regions. The coxa is a short segment attaching the leg to the body. The femur is usually quite large and is followed by the tibia, which is usually the longest segment of the leg. Beyond the tibia comes the tarsus or foot, which consists of up to five short segments and usually ends in a pair of claws. Crickets even have their ears on their front legs.
The abdomen has no limbs, but may have a pair of outgrowths at the rear. These are called cerci. They are often hair-like and used like an extra pair of antennae. Silverfish and some mayflies have an additional filament between their cerci. Earwig cerci form sturdy pincers that may be used in fighting. The males of many bush-crickets and some other insects have curved cerci used for grasping the females during mating. Many females have a prominent ovipositor or egg-layer projecting from the rear end.
Insect Life Histories
Although some species, including many aphids, give birth to active young, the majority of insects start life as eggs. The young that hatch from the eggs have no wings and cannot fly. They usually grow very rapidly. Their outer skin is not alive and, although it can stretch a little, it cannot grow. The insect therefore has to change its skin several times as it grows. These skin changes are called moults. Most species moult between four and ten times, but some undergo up to 50 moults. During a moult, the outer skin of the insect becomes very thin and brittle and the insect eventually breaks out of it – but not until it has secreted a new, looser coat underneath the old one.
The change from young to adult form is called metamorphosis and it follows one of two major pathways. In the first group, typified by the dragonflies and grasshoppers, the young, called nymphs, do not look very different from the adults.
Their wings develop gradually on the outside of the body, getting larger at each moult until, at the final moult, they reach full size and become functional. This kind of metamorphosis is called partial or incomplete metamorphosis.
In the second group, which includes the lacewings, beetles, flies and wasps, as well as the butterflies and moths, the young do not look anything like the adults. They often lack legs as well as wings and they are called larvae or grubs. They get larger at each moult, but show no sign of wings. When a larva is fully grown, it moults again, and when the skin is shrugged off this time it reveals a chrysalis or pupa. This is a non-feeding stage and it rarely moves, but great changes take place inside it as the larval body is broken down and re-built in the adult form. The outlines of the adult wings and legs can usually be seen on the surface of the pupa. When the changes are complete the adult bursts out of the pupal skin, expands and dries its wings, and flies away. This kind of development is called complete metamorphosis.
Species Entries
English and scientific names are given for most species described in this book, but many of the smaller and less familiar insects have never received English names and the same is true of many non-British species. Only the scientific names can be given for these insects.
Each species has a short text outlining its behaviour and life cycle and pointing out those features that are useful in identifying the species. The sexes are mentioned only if there are major differences between males and females.
SIZE is the average length of the body, including the wings if these are habitually folded along the sides or top of the body as in grasshoppers and crickets, but not including the ovipositor. Wingspans are given for insects that regularly rest with their wings open.
HABITAT is the main type of countryside or surroundings in which the insect is likely to be found.
RANGE is the geographical area in which the species is found. N Europe is Scandinavia and Denmark, and the far N refers to areas above the Arctic Circle. C Europe is Central Europe, roughly between 45° and 55° N, but including the whole of the British Isles. S Europe is everywhere south of 45°N, which coincides roughly with a line from Bordeaux to the Danube Delta. Remember that an insect does not necessarily occur everywhere within its range: only where the habitat is suitable.
SEASON is the time of year at which the adult insect can be found somewhere in its range, but the season may be much shorter in the north.
SIMILAR SPECIES lists those species with which the insect might be confused and points out the main differences between them.
BRISTLETAIL ORDER
Silverfish
Lepisma saccharina
Bob Gibbons
A fast-running, wingless insect, covered with silvery scales, that lives mainly in houses, especially in dark cupboards and on undisturbed bookshelves. It prefers slightly damp spots and is mainly nocturnal. It feeds on moulds and starchy materials, including book-bindings and the glue of cartons, and can cause serious damage to books and other papers.
SIZE Up to 12 mm.
HABITAT Mainly in houses and other buildings, but often out of doors in S Europe.
RANGE Worldwide.
SEASON All year.
SIMILAR SPECIES The Firebrat is browner with longer antennae and tail filaments.
Ephemera danica
MAYFLY ORDER
Bob Gibbons
Bob Gibbons
Look for the dark-spotted cream or greyish top of the abdomen to distinguish this insect from several similar species with spotted wings. There are three tail filaments. Like all mayflies, the insects fly mainly by night. The nymphs live in lakes and rivers with plenty of silt or fine sand on the bottom, and take two years to mature.
SIZE 15 mm (without ‘tails’): wingspan 30–45 mm.
HABITAT Lakes and rivers and surrounding areas.
RANGE Most of Europe.
SEASON April–September.
SIMILAR SPECIES Other Ephemera species have similar wings but brown or yellowish abdomens.
Centroptilum luteolum
MAYFLY ORDER
Michael Chinery
One of several rather similar species with two ‘tails’ and hindwings in the form of tiny straps. Note the six pale, translucent abdominal segments. The male, shown here, has a turret-like expansion on the top of each eye, although this feature is shared by several related species. The nymphs live in streams and rivers, and in lakes with stony bottoms.
SIZE 5–8 mm (without ‘tails’): wingspan 12 mm.
HABITAT Rarely far from the lakes and streams in which the nymphs develop.
RANGE All Europe.
SEASON April–November.
SIMILAR SPECIES C. pennulatum is a little larger, with paler eyes and only five pale abdominal segments.
DRAGONFLY ORDER
Banded Demoiselle
Calopteryx splendens
David Element
David Element
The mature male, shown here, has a brilliant metallic blue body and a dark blue patch on the outer part of each wing. In SW Europe the patches may extend to the wing-tips. The female is metallic green, usually becoming bronze with age, and has yellowish-green wings. The insect prefers slow-moving rivers and canals with muddy bottoms.
SIZE 45 mm: wingspan 60–65 mm.
HABITAT Waterside vegetation.
RANGE Most of Europe except Scotland and most of Scandinavia.
SEASON April–September.
SIMILAR SPECIES Male Beautiful Demoiselle has blue almost to the wing base and female’s wings are browner.