this is a ppt on morphology of cockroach , the first part of the chapter of class 11 Structural organisation of animals .

2. Cockroach
Phylum Arthropoda
Class Insecta

3. cockroaches have also been reported in tropical regions .
 Their size ranges from ¼ inches to 3 inches (0.6-7.6 cm) .
 They have long antennae , legs and flat extension of the upper body wall that conceals head .
• They are nocturnal omnivorous .
• They live in damp places throughout the world .
• They are serious pests .
• They are vectors of several diseases
Green CockroachBright Yellow Red Cockroach

4. DORSAL VIEW OF COCKROACH
Exoskeleton has hardened plates called :
Tergites dorsally

5. VENTRALVIEWOF COCKROACH

7. The most common species of
cockroach is Periplaneta americana .
 They are about 34 – 53 mm long
with wings that extend beyond the
tip of the abdomen in males .
 The body of cockroach is segmented
and divisible into head , thorax and
abdomen .
 Sclerites and Tergites are joined to
each other by a thin and flexible
articular membrane (arthrodial
membrane )

8. HEAD
• Head is triangular in shape and lies anteriorly at
right angles to the longitudinal body axis .
• It is formed by the fusion of 6 segments and shows
great mobility in all directions due to flexible neck.
• Head has following parts as well :

9.  The head capsule bears
1. A pair of compound eyes :
A compound eye is an eye which consists of
various small parts which together make a
compound eye , and form a collective image of
the object
2. A pair of thread like antennae :
(i) Antennae are arising from membranous
sockets lying in front of eyes
(ii) Antennae have sensory receptors that help in
monitoring the environment .

10. 3. Anterior end of the head bears
appendages forming biting and
chewing type of mouth parts.
The mouth parts consisting of :
I. Labrum : Upper lip
II. A pair of mandibles
III. Labium : Lower lip
IV. A pair of maxillae
V. A median flexible lobe , acting
as tongue i.e Hypopharynx ,
lies within the cavity enclosed
in the mouth parts .

11.  Thorax consists of three parts :
1. PROTHORAX
2. MESOTHORAX
3. METATHORAX
 The head is connected with thorax by a short extension of
the prothorax known as the NECK .
 Each thoracic segment bears a pair of walking legs .
 The first pair of wings arises from mesothorax and second
from metathorax.
 Forewings ( mesothoracic ) called Tegmina are opaque dark
and leathery and cover the hind wings when at rest .
 The hind wings are transparent , membranous and are used
in flight .
THORAX

12.  Abdomen consists of 10 segments
 The 7th sternum is boat shaped and together with the
8th and 9th sterna forms a Brood or Genital Pouch
whose anterior part contains female gonopore ,
spermathecal pores and collateral glands .
 In both sexes , the 10th segment bears a pair of
jointed filamentous structures called anal cerci
FEMALE ABDOMEN

13. o The abdomen of males also consists of 10 segments .
o In males genital chamber or pouch lies at the hind end of
abdomen bounded dorsally by 9th and 10th terga and ventrally by
9th sternum .
o It contains dorsal anus , ventral male genital pore and
gonapophysis
o Males bear a pair of short , thread like anal styles which
are absent in females .
o The 10th segment bears a pair of jointed filamentous structures
called anal cerci .
MALE ABDOMEN