This document discusses the evolution and classification of Hexapoda and Myriapoda. It notes that Hexapoda includes insects, which are the most abundant and diverse terrestrial animals, with over 750,000 known species. Myriapoda adapted to live on land through traits like an exoskeleton for support, the evolution of flight, and a waxy cuticle to prevent water loss. The document classifies Myriapoda into four classes - Diplopoda, Chilopoda, Pauropoda, and Symphyla - providing key details about each, such as their habitat, size, number of body segments and legs.

1. By
Kanwal Nisa

2. Hexapoda and Myriapoda

3. Evolutionary prospects
 Hexapoda (hexa-six poda-feet)
 Myriapoda (myria-many poda-feet)
 It includes the insect and most abundant and
diverse group of the terrestrial environment.
 Zoologist study 750,000 speiese of insects.
 More then 30 million speiese are present
 Earle divonion period most animals are
uninhabited.

4. Continue….
 After low growing herbaious, plants,
forest the ozone layer is formed that
make the survival of individual animals
easy.
 Larvae undergoes metamorphosis.
 High reproduction rate.
 Animals with adapted that permit life on
land.

5. Hexapoda and myriapoda

6. Adaptation/Factors
 Exoskeleton formation that provide
support to the body
 Evolution of flight;
• collect widely scattered food.
• help in reproduction, feeding,
• protect from predators.
 Waxy epicutical layer that preserve
water loss

7. classification
 Class diplopoda
 Class chilopoda
 Class pauropoda
 Class symphyla

8. Class diplopoda
 About 1600 speiese.
 Live in terrestrial environment.
 Metamirism process.
 Segment about 10 to 100 .
 Two pairs of legs are present
 in each segment.
 They have short antenna.
 Cylindrical body.

9. Continue…
 They feed on dead decaying matter by
use of Mandible.
 Defuse against predators by use of
chemical hydrogen cyanide (HCN).
 Reproduction:
• Male millipade transfer sperm to female
with spermatophora.

10. Class chilopoda
 Live on forest, rock.
 Lack waxy epicutical.
 Feed on earthworms, snails,
 small arthropods.
 Reproduction:
• Male lays down silk web and
• place spermatophora.
• Female pick silk web and take into genetal pore.
• Eggs are fertilized into new individual

11. Class pauropoda
 There size varries from 0.5mm to 1.5mm.
 Body segments are 8 to 11.
 Live on forest, rock.

12. Class symphyla
 Live on forest and rock.
 There size varry from 2mm to 10mm.
 Body segment are 12.
 They have only 1 pair of legs on each segment.