Order dermaptera by Christiana :)

PROJECT
IN

ENTOMOLOGY
“DERMAPTERA”
Submitted to:
Ms. Linsay Panoy
Prepared by:
Christiana Lyn Caole

prepared by: Christiana Lyn Caole

ORDER DERMAPTERA
(EARWIGS)

I. A. ORIGIN


OF NAME


Greek words derma, skin (texture); ptera, wing, refers to the
thickened forewings that cover and protect the hind wings

B. DISTINGUISHING
CHARACTERISTICS








General body shape: Elongate; dorso-ventrally

flattened.
Head: Prognathous. Antennae are segmented.
Biting-type mouthparts or the
Chewing (mandibulate) mouthparts
Ocelli absent. Compound eyes in most species,
reduced or absent in some taxa.
Appendages: Two pairs of wings normally present.
The forewings and hindwings.
Abdomen: Cerci are unsegmented and resemble
forceps. The ovipositor in females is reduced or
absent.


The characteristics which distinguish the
order Dermaptera from other insect
orders are:

ANTENNAE

- are short and are used for exploring the surface area just
ahead of them

PRESENCE OF WINGS


1. Wingless (species under suborder Hemimerina. )




An adult Epizoic earwig (Hemimerus sp.)



2. Winged ( 2 pairs) for adults

Front wings- The forewings are modified into short smooth, veinless tegmina
that serve as protective covers for the hind wings
 Hind wings - membranous rounded with radiating veins folded beneath front
wings. They are large, fan-shaped and pleated. They fold (both length-wise and
cross-wise) to fit beneath the front wings when not in use.



ABDOMINAL SEGMENTS
Males - 10-segment abdomen
 Females - 8-segment abdomen apparent



CERCI
attached at the last abdomenal segment.
 They are enlarged and thickened to
form pincers (forceps).
Pincers - are used in grooming, defense,
courtship, and even to help fold the hind
wings for holding prey, and in copulation.
 Earwigs individual's sex is determined by
the shape of its cerci.


relatively straight in females, more curved in
males. In some species, the males have
asymmetrical cerci.




C. CLASSIFICATION



Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
 Class Insecta (Insects)
•Order Dermaptera (Earwigs)

SUBORDERS
1.

3.

4.

group. The cerci are unsegmented, and modified into large,
forcep-like structures.
Arixeniinae is represented by two
genera, Arixenia andXeniaria with a total of five species in
them:Arixenia esau and Xeniaria jacobsoni being the most
well-known.
Archidermaptera - the only extinct suborder of earwigs,
known only from Jurassic fossils.Also known as Fossil
Dermaptera. The suborder is classified on the basis of general
similarities. They have unsegmented cerci and tarsi with four
to five segments.
Hemimerina are wingless, blind and viviparous ectoparasites
and have filiform segmented cerci. The most well known
species is Hemimerus bouvieri.


2.

Forficulina - They make up the largest and most familiar

SUBORDERS


Archidermaptera


FAMILIES


1. Forficulidae (Common earwings) -- This family
includes several cosompolitan species, including Doru
eculeatum and Forficula auricularia.



Labiduridae -- Reddish-brown earwings with long
cerci. Labidura riparia is the only member of this family
found in the United States.



Carcinophoridae -- Dark brown or black insects with reddish
brown legs and small cerci. The family includes one very
common species, Euborellia annulipes.



Labiidae – known as little earwigs. members are small,
winged earwigs, generally less than 1.5 centimetres (0.59 in)
in length

5. Chelisochidae - commonly known as black earwigs


6. Pygidicranidae do not have any ocelli. They are small, flattened-looking
body, which has a dense covering of bristly hairs (setae). Cannibalism of
young has been observed in at least one species in the family, Challia
hongkongensis, in which an adult female was found eating a stillliving nymph of the same species.

D. L IFE CYCLE



Type of metamorphosis: Hemimetabola incomplete
development (egg, nymph, adult). 4 to 6 molts.The
developmental stages between molts are called
instars.

II. PHYSICAL FEATURES

Immatures:
 Structurally similar to adults
 Developing wingpads may be visible on
thorax


Adults:
 Antennae slender, beaded
 Mouthparts mandibulate, prognathous
 Tarsi 3-segmented
 Front wings short and leathery
 Hind wings semicircular and pleated
 Cerci enlarged to form pincers (forceps)

III. BIOLOGICAL SUMMARY FOR THE ORDER
A. Life history


overwinter as adults, usually one generation/year

C. Significance
 Most are not pests, except for Forficula Auricularia
(European earwig); substantial damage to vegetable crops,
ornamentals and fruit trees


B. Collecting and preserving
 Collect in alcohol or pin (most in right tegman or wing,
like a beetle)
 Collect from under bark, grasses, roots, mullin, some from
light pit-fall traps


D. Habitat and Habits
 Nocturnal . Earwigs are sensitive to heat and dryness, so they
usually hide in cool, dark places during the day and come
out at night.Hide during day - cracks, crevices, under bark,
protected places (e.g., under my deck)
 Eating habits: Mostly Scavengers - dead and decaying plant
material, but also on tender plants but some are omnivorous
or predatory



Female guards eggs until hatched Another distinct maternal care unique
to earwigs is that the mother continuously cleans the eggs to protect
them from fungi When the eggs were replaced after hatching, the
mother continued to clean them for up to 3 months.

FACTS:
Most earwigs are flattened (which allows them to fit
inside tight crevices, such as under bark) with an
elongated body generally 7–50 millimetres (0.28–
1.97 in) long.
 The largest certainly extant species is the Australian
giant earwig (Titanolabis colossea).
 The possibly extinct Saint Helena earwig (Labidura
herculeana) .



Order dermaptera by Christiana :)

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