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Chewing mouthparts
Chewing
mouthparts
{
-/^: '
f//
-? z_ ,6w
4*
Chewing
mouthparts
Chewing
mouthparts
Jointed legs
H
Chewing
mouthparts
Abdominal gill
Posterior claws
Portable case
3.
No lointed legs
Chewing mouthparts in larva
lnsects with chewing mouthparts; forewings are hardened Coleoptera
and meet along the midline of the body when at rest (they (beetles)
may cover the entire abdomen or be reduced in length).
Use the simplified key to identify each of
the orders (by order or common name) of
aquatic insects (A-l) pictured above:
Mouthpa.ts piercing or sucking and form a pointed cone Go to z
Wilh chewing mouthparts, but without hardened lorewings Ga to S
for
water.
Mouthparts form a short, pointed beak; legs fringed
swimming or long and spaced for suspension on
(a) Order of insect A:
Mouthparts do not torm a beak: legs (if present) not
or long, or spaced apart.
(b) Order of insect B:
(c) Order of insect C:
fringed
Goto 4
Without three tail
be
filaments
Without long tail filaments
Gotoo
thorax
Go to 7
non-segmenied Diptera
(true fties)
Abdomen with pairs of non-segmented prolegs
rows of fine hooks.
bearing
Without pairs of abdominal prolegs
With eight pairs ol finger-like abdominal gills;
with two pairs of posterior
claws.
Order of insect
I
Lepidoptera
(moths and butterflies)
GotoB
abdomen
Megaloptera
(dobsonflies)
Either, without paired. abdominal gills. or. if such gills
prosent, wilhout posterior claws.
(i)
s
Plecoptera (stonef lies)
(g) Order of insect G:
(h) Order of insect H:
Ephemeroptera
(mayllies)
Abdomen terminating in two tail filaments
present).
7
(dragonflies & damselflies)
Go to
Without jointed, thofacic legs (although
prolegs or lalse legs may be
F:
s
Without a prominent, extendable labium
With three pairs of jointed legs on
(f) Order of insect
Go to
Odonata
hairs.
(e) Order of insect E:
(bugs)
Promrnent upper lip (labium) extendable, forming a lood
capturing struclure lonaer than the head.
Abdomen terminating in three tail filaments which may
long and thin, or with lringes of
(d) Order of insect D:
Hemiptera
are
Go
b9
claws Trichoptera
case.
(caddisfries)
Abdomen with a pair of posterior prolegs bearing
with subsidiary hooks; sometimes a portabre
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3nal 2CAB-201',
ISBN: 978-l-877462-A2-5
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