Download Insect Taxonomic Diversity

Insect Taxonomic
Diversity
By: Tcorey Bell
Zoology 3rd
Insect Orders
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Ephemeroptera
Odonata
Blattaria
Isoptera
Dermatptera
Orthoptera
Phasmida
Hemipter
Cleoptera
Lepidoptera
Diptera
Siphonoptera
Hymenoptera
Mantodea
Plecoptera
Ephemeroptera
• Adult: body delicate or "flimsy", varying from almost transparent to white, yellow, orange, green, brown, or
black; thorax and abdomen bare, often shiny; legs slender, solid color; front legs often held forward and
sometimes upward in front of head when at rest; forewings large, triangular, with many cross veins; hind
wings much smaller than forewings (hind wings absent in some species); both wings usually transparent but
sometimes patterned, held vertically and together above thorax when at rest
• Pre-adult: wings cloudy in appearance, body dull and pubescent, with appendages somewhat shorter -- but
otherwise similar to imago; pre-adults molt a final time to become adults
• Nymph: body elongate, flattened or cylindrical, usually greenish or brownish but color varies according to
the type of food eaten; legs long; antennae short; abdomen with lateral plate-like gills and usually three long
thin tail projections (cerci); some species have only two cerci
Odonata
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Characteristics
These often brightly colored, fast flying insects are well known and easily recognized. Dragonflies and damselflies are medium to large insects
with body lengths ranging from 15-120 millimetres. They are often seen flying rapidly over streams and lakes, or through gardens at dusk,
often following regular flight paths every day. Dragonflies and damselflies can be recognized by the following features: Abdomen long and
slender
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Large compound eyes
3 ocelli
Very small antennae
Mandibulate mouthparts
Two pairs of membranous wings of similar shape and size
Complex wing venation with many cells
Damselflies and dragonflies are very similar but can be separated by looking at their wings. In dragonflies the hind wings are slightly broader
than the forewings and in damselflies both wings are more or less similar size. Wings are held horizontally to the body in dragonflies and
vertically in damselflies when at rest.
Blattaria
• Cockroaches are long, flat, brown insects. Their heads point downward and
have chewing mouthparts. A plate from the top of the thorax covers the
head when you look down on them, so you can't actually see the head. They
are very fast runners. They have long antennae, and at the end of the
abdomen are two short antennae-like structures that sense air current and
vibrations.
• Other Physical Features : bilateral symmetry
• Sexual Dimorphism : female larger
Isoptera
• Characteristics
Termites are small to medium sized insects ranging form 3-20 millimetres in body length.
These insects are not often seen although evidence of their presence is observable in the
large mounds they construct or the damage they do to wood products and structures.
Termites can be distinguished by the following features: Pale, elongate body
• 2 pairs of membranous wings of equal length. Wings are present in reproductive castes only
and shed after mating
• Mandibulate (chewing) mouthparts
• Antennae about the same length as the head
Dermatptera
• Characteristics
Earwigs are a distinctive group of insects of small to medium size, ranging from 5 to 50 millimetres in
length. Earwigs are sometimes confused with Staphylinid beetles, but can be distinguished from the latter by
the presence of pincer-like cerci, which Staphylinid beetles lack. Earwigs are mostly dark colored (brown to
black) and can be recognized by the following features: Flattened elongated body
• Heavily sclerotized pincer-like cerci. Females have straight cerci with a inward pointing tip and males have
curved cerci
• 2 pairs of wings. The forewings are short and protectively hardened. The hind wings are membranous and
folded in a fan-like way underneath the forewings when not in use. Some species are also wingless
• Chewing (mandibulate) mouthparts
• Moderately long antennae
Orthoptera
• Characteristics
Grasshoppers, crickets, katydids and locusts all belong to the order Orthoptera which means 'straight wings'. Most are easily
recognisable by their hind legs, which are usually enlarged for jumping. They are often easily seen jumping away when
disturbed or heard 'singing' at night. They are mainly medium to large insects with some species in Australia growing to a
length of 10 centimeters. There are about 3000 species in Australia and all can be distinguished from other insects by the
following features: 2 pairs of wings. The forewings are narrower than the hind wings and hardened or leathery at the base.
They are held roof-like overlapping the abdomen at rest. The hind wing is membranous and held folded fan-like under the
forewings when at rest
• Mandibulate mouthparts
• Large compound eyes
• Antennae may be short to very long depending on the species. Grasshoppers have relatively short antennae while crickets
and katydids generally have long antennae
• Hind legs are enlarged and modified for jumping
Phasmida
• Identification
• Body and legs very long and slender; no wings in our spp. (one species
in Florida has very short wings, many exotic forms are fully winged)
Hemiptera
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Hemiptera: bugs, aphids and cicadas
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Characteristics
The insects in this order are extremely diverse in their size, shape and color. There are about 6000 described species in Australia, ranging in size from 1 to 110
millimetres in length. The name Hemiptera means 'half wing' and all hemipterans share the following features:2 pairs of wings, although some species may be wingless
and others have only forewings. Wings are generally membranous but in some species the forewings may be hardened at the base
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Piercing or sucking mouthparts appearing as a sharply pointed tube known as a proboscis or rostrum, which extends from the underside of the head
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Compound eyes of various forms
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Up to 3 ocelli present
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Antennae vary and may be either short, or long and conspicuous
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The young of hemipterans look like small adults. Some bugs may be mistaken for beetles but can be distinguished by their mouthparts as beetles have mandibulate
mouthparts while bugs have sucking/piercing mouthparts.
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This order is divided into 3 suborders; true bugs (Heteroptera); hoppers (Auchenorrhyncha) and; aphids, scale insects, lerps and mealy bugs (Sternorrhyncha).
Coleoptera
• Characteristics
Beetles constitute the largest and most diverse order of insects on earth, making up about
30% of all animals. There are over 300 000 species of beetles worldwide and over 28 000
species spread across 117 families in Australia. Beetles come in a variety of shapes and
colors and can range from 0.4 to about 80 millimetres in length. Due to the variation within
the order it is difficult to give a general description however all beetles characteristically have
the following features:2 pairs of wings. Forewings hardened, hind wings membranous
• Mandibulate mouthparts which are designed for biting and chewing
• Antennae present in a variety of forms
• Compound eyes in a variety of sizes and shape
Lepidoptera
• Characteristics
This is one of the most well known and easily recognisable orders of insects and contains about 21 000
species in Australia. Moths and butterflies are grouped together in the order Lepidoptera, which means 'scaly
wings'. Below are the main characteristics of butterflies and moths. 2 pairs of membranous wings that are
covered in tiny scales which overlap like shingles on a roof. A few moths are wingless
• Large compound eyes
• One ocelli present above each eye
• Antennae present. Antennae are long and slender in female moths and generally feathery in male moths.
Butterflies have clubbed antennae
• Mouthparts are formed into a sucking tube known as a haustellum
• The larvae are typically known as caterpillars and have a sclerotized head with chewing (manipulate)
mouthparts, 3 pairs of thoracic legs and often short, unsegment prolegs on the abdomen.
Diptera
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Immatures:
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Culiciform
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Head capsule present with chewing mouthparts
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Legs absent
Vermiform (maggots)
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Without legs or a distinct head capsule
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Mouthparts reduced; only present as mouth hooks
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Adults:
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Antennae filiform, sty late, or aristate
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Mouthparts sectorial (haustellate)
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Mesothorax larger than pro- or metathorax
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One pair of wings (front); hind wings reduced (halters)
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Tarsi 5-segmented
Siphonoptera
• Characteristics
Fleas are small, wingless insects ranging in size from approximately 1-10 millimetres in length
depending on the species. Almost everybody, especially those with cats or dogs will be familiar
with these small biting insects and will have either seen them or the effects of their nuisance
bites. Fleas can be recognized by the following features: Laterally compressed bodies
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Piercing-sucking mouthparts
Enlarged hind legs adapted for jumping
Strong tarsal claws adapted for holding onto their hosts
Backward pointing hairs and bristles for ease of movement through the hair of a host
Small antennae which tuck away into special groves in the head
Hymenoptera
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Typically two pairs of wings, with forewings usually larger than hind wings, but some groups (such as ants) wingless in most life stages.
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Wings have few cross-veins, these are angled to form closed cells.
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Antennae typically with 10 or more segments. Often 13 segments in male, 12 in female, but sometimes as few as 3 or up to 60 segments.
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Antennae longer than head, but usually not highly elongated (longer than head and thorax combined). Highly elongated in some parasitic groups.
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Females have prominent ovipositor, modified in some groups to be a "stinger", used to paralyze prey and for defense.
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Chewing mouthparts, but some groups have a "tongue" used for lapping up fluids, such as nectar.
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Complete metamorphosis.
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Several groups highly social (eusocial), with separate reproductive and worker castes.
Mantodea
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Characteristics
Praying mantis are often easily recognized due to their large size, which can range from 10 to 120 millimetres in body length and their
characteristic way of standing with forelegs held together as if they were praying. All praying mantis have the following features: Elongated
body
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Raptorial front legs with one or two rows of spines
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Some species of Neuroptera in the family Mantispidae, like the one pictured below can be mistaken for praying mantis as they also have
raptorial front legs, however further examination reveals they do not have the hardened forewings present in Mantodea.
2 pairs of wings, both of which are used in flight. Although some species have reduced wings and others are wingless
Forewings protectively hardened to cover the membranous hind wings when at rest
Very mobile triangular shaped head with distinctive ocelli
Large compound eyes
Short to medium sized filiform antennae
The males of most species are fully winged while many females have either reduced wings or no wings at all. The nymphs of praying mantis
look like small adults but lack wings or have developing wing buds.
Plecoptera
• Characteristics
Stoneflies are soft-bodied insects that can grow up to 50 millimetres long with a wingspan of 100 millimetres. Adult
stoneflies are always found near freshwater as they have aquatic larvae and as adults they are not powerful fliers. They
therefore have poor dispersal capabilities are rarely move far from the place they were born. Stoneflies are recognisable by
the following characteristics:Elongated, flattened, soft body
• 2 pairs of membranous wings that are held curved around the body at rest. Some species are wingless while others have
reduced wings
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Hind wings slightly wider than forewings
Long legs
Mandibulate mouthparts
2 cerci at tip of abdomen
The larvae of stoneflies are aquatic and appear similar to the adults but lack wings. Larvae also possess external gills along
the edge of their abdomens and at the tip.
The End