The Abdomen in Insects
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ABDOMEN
The abdomen is the posterior end of the three
body regions of an adult insect. It is composed of
11
segments.
The abdomen bears the external genitalia of the
insect. In female insects these consist of an
ovipositor.
Each segment of the abdomen
consists of a dorsal
sclerite, tergum, and a ventral sclerite.
A
BDOMEN
IN
INSECTS
IS
DIVIDED
INTO
THREE
MAIN
AREAS
pregenital segments
: which include the first
seven episodes and be free from appendages in
the adult phase
Genital segments
: Include the ninth Episode in
male and carrying genital appendages. In
females, paired appendages of the eighth and
ninth abdominal segment fit together to form an
egg-laying mechanism called the ovipositor
Postgenital segments
: Include the tenth and
eleventh segment . carrying the two appendages
analcerci.
A
BDOMEN
APPENDAGES
Genital appendages
Genital appendages
Analcerci
Analcerci
O
VIPOSITOR
The ovipositor is an organ used by
The ovipositor is an organ used by
insect females for oviposition (laying
insect females for oviposition (laying
of eggs).
of eggs).
consists of three pairs of appendages
consists of three pairs of appendages
formed to transmit the egg, to prepare
formed to transmit the egg, to prepare
a place for it, and to place it properly.
a place for it, and to place it properly.
In some insects the ovipositor is used
In some insects the ovipositor is used
merely to attach the egg to some
merely to attach the egg to some
surface. It is used by grasshoppers to
surface. It is used by grasshoppers to
force a burrow in the earth to receive
force a burrow in the earth to receive
the eggs.
the eggs.
The sting of Hymenoptera (bees) is
also an ovipositor, in this case highly
modified and associated with poison
glands that are used to paralyze prey.
This would allow eggs to be laid
without the host fighting back, and
probably also to suppress the host's
immune system so that it can't destroy
the eggs or shake off the paralysis.
O
VIPOSITOR
OF
AN
ADULT
FEMALE
C
AROLINA
MANTIS
(
S
TAGMOMANTIS
C
AROLINA
)
M
ALE
GENITALIA
Male genitalia in many insect species have
species-specific male genitalia
with
morphological divergence among closely related
species that is often dramatic and complex.
The two main organs in male external genitalia
are the
aedeagus
aedeagus
which is used to transfer
sperms from male to female genital duct, and a
pair of
claspers
claspers
which are used for holding the
female during coupulaion.
S
ECONDED
: N
ON
R
EPRODUCTIVE
APPENDAGES
Include appendages that do not have relation to
reproduction and which are on pregenital and
Postgenital segments. Divided to:
A
NALCERCI
Commonly found in both male and female may be
long with many segment such as silver fish(lepisma).
short and divided as in the cockroach.
short, and stronghold, such as locusts.
Thorley form of tweezers or insect used in defense
and attack, as in the Forficula auricularia.
Long and non divided such as Ground dwelling
insects.
mutate to the gills to breathe, as in (nymphs) , who
lives in the small water
Pro-legs
: fleshy, locomotory appendages found
only in the larvae of certain orders
Hymenoptera).
Abdominal gills
: respiratory organs found in
the nymphs (naiads) of certain aquatic insects. In
Ephemeroptera (mayflies), paired gills are
located along the sides of each abdominal
segment; in Odonata
N
ON
SEXUAL
APPENDAGES
IN
PRIMITIVE
INSECTS
Collembola have three pre-genital appendages on
three abdominal segments. From the first segment, a
median lobe projects forward and down between the
last pair of legs, this is known as the ventral lobe and
at its tip are a pair of vesicles. This ventral lobe
appear to have two main functions:
1- In some circumstances it function as an adhesive
organ
2- Absorption of water from substratum
The appendages of third and fourth segment of the
abdomen of many Collembola form the retinaculum
and furca which are used in locomotion.
The abdomen in insects is a crucial body region composed of 11 segments, each with specific functions such as bearing external genitalia and ovipositors. It is divided into pregenital, genital, and postgenital segments, with appendages specialized for reproduction. The ovipositor, essential for egg-laying, varies in structure and function across insect species. Male genitalia also exhibit species-specific adaptations for sperm transfer and copulation.
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Presentation Transcript
The abdomen is the posterior end of the three body regions of an adult insect. It is composed of 11 segments. The abdomen bears the external genitalia of the insect. In female insects these consist of an ovipositor. Each segment of the abdomen consists of a dorsal sclerite, tergum, and a ventral sclerite.
ABDOMEN IN INSECTS IS DIVIDED INTO THREE MAIN AREAS pregenital segments: which include the first seven episodes and be free from appendages in the adult phase Genital segments: Include the ninth Episode in male and carrying genital appendages. In females, paired appendages of the eighth and ninth abdominal segment fit together to form an egg-laying mechanism called the ovipositor Postgenital segments: Include the tenth and eleventh segment . carrying the two appendages analcerci.
ABDOMEN APPENDAGES Genital appendages Analcerci
OVIPOSITOR The ovipositor is an organ used by insect females for oviposition (laying of eggs). consists of three pairs of appendages formed to transmit the egg, to prepare a place for it, and to place it properly. In some insects the ovipositor is used merely to attach the egg to some surface. It is used by grasshoppers to force a burrow in the earth to receive the eggs.
The sting of Hymenoptera (bees) is also an ovipositor, in this case highly modified and associated with poison glands that are used to paralyze prey. This would allow eggs to be laid without the host fighting back, and probably also to suppress the host's immune system so that it can't destroy the eggs or shake off the paralysis.
OVIPOSITOR OF AN ADULT FEMALE CAROLINA MANTIS( STAGMOMANTIS CAROLINA)
MALE GENITALIA Male genitalia in many insect species have species-specific male genitalia with morphological divergence among closely related species that is often dramatic and complex. The two main organs in male external genitalia are the aedeagus which is used to transfer sperms from male to female genital duct, and a pair of claspers which are used for holding the female during coupulaion.
SECONDED: NON REPRODUCTIVE APPENDAGES Include appendages that do not have relation to reproduction and which are on pregenital and Postgenital segments. Divided to:
ANALCERCI Commonly found in both male and female may be long with many segment such as silver fish(lepisma). short and divided as in the cockroach. short, and stronghold, such as locusts. Thorley form of tweezers or insect used in defense and attack, as in the Forficula auricularia. Long and non divided such as Ground dwelling insects. mutate to the gills to breathe, as in (nymphs) , who lives in the small water
Pro-legs: fleshy, locomotory appendages found only in the larvae of certain orders Hymenoptera). Abdominal gills: respiratory organs found in the nymphs (naiads) of certain aquatic insects. In Ephemeroptera (mayflies), paired gills are located along the sides of each abdominal segment; in Odonata
NON SEXUAL APPENDAGES IN PRIMITIVE INSECTS Collembola have three pre-genital appendages on three abdominal segments. From the first segment, a median lobe projects forward and down between the last pair of legs, this is known as the ventral lobe and at its tip are a pair of vesicles. This ventral lobe appear to have two main functions: 1- In some circumstances it function as an adhesive organ 2- Absorption of water from substratum The appendages of third and fourth segment of the abdomen of many Collembola form the retinaculum and furca which are used in locomotion.
