This document discusses the sternites and pleurites of insects. It defines sternites as the ventral portion of an insect's thorax or abdomen, consisting of sclerotized plates. There are four types of sternites: adaphagid, haplogastious, symphiogastrous, and hologastrous. Pleurites are chitinous plates or sclerites in the pleural area of the body wall. They are only present in the thorax and contain sutures for muscle attachment to move legs and wings. The document provides details on the structure, position, and functions of sternites and pleurites in insects.

1. Sternites & Pleurites of
Insect
Prepared By
Nusrat Hasan Kanika
Roll No: M140604004
M.Sc. 1st Semester (Branch Entomology)
Jagannath University,Dhaka.

2. Insect Sternites
• The sternum (pl. "sterna") is the ventral
portion of a segment of an arthropod thorax
or abdomen
• A ventral plate of the exoskeleton; ventral
equivalents of the tergites

3. Position of Sternite

4. Types of Sternites
The Adaphagid Type
The Haplogastious Type
The Symphiogastrous Type
The hologastrous Type

5. STERNITE 10 (male)
In Cyclorrhapha, a sclerite between the
epandrium and the phallus
In Tephritidae, this term has been used for the
transverse sclerite connecting the basal ends of
the medial surstyli,
 this structure is a composite of the dorsal bridge
of the hypandrium and the subepandrial sclerite
of other Cyclorrhaphan Diptera
The subepandrial sclerite has two anteriorly
projecting lobes and one or two transverse
connections or bridges. It has also been called
sternite 10 or the interparameral sclerite

6. STERNITE 10 (male)

7. Function of Sternite
• A sclerotized sternum covers the bottom
• Pliable membranes separate the terga from
the sterna
• The intersegmental membranes allow the
abdomen much flexibility
• A requirement for respiratory movements,
copulation
• Help in oviposition

8. Insect Pleurites
• Pleurites are chitinous plates in the body wall
of insects and myriapods.
• Any of various small sclerites in the pleural
area of an arthropod.
• Pleuritesis the membranous part of the lateral
abdominal wall of some insects

9. Position of Pleurite
• Pleurites are only present on the thorax, while
tergites and sternites are present on both the
thorax and the abdomen.

11. Pleurite Functions
• Note the sutures in the pleurites, indicating
inward projections for muscle attachment for
the large muscles which move the legs and
wings