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 Metamorphosis ZOO 311  Presented by:  Metamorphosis ZOO 311  Presented by:

Metamorphosis ZOO 311 Presented by: - PowerPoint Presentation

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Metamorphosis ZOO 311 Presented by: - PPT Presentation

hessa al obaid Metamorphosis is a biological process by which an animal physically develops after birth or hatching involving a conspicuous and relatively abrupt change in the animals body structure through cell ID: 776049

larva eggs egg stage larva eggs egg stage metamorphosis body head legs insect larvae adult appendages pupae types insects

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Slide1

Metamorphosis

ZOO 311

Presented by:

hessa

al-

obaid

Slide2

Metamorphosis

is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell

growth and

differentiation.

Slide3

Types of Metamorphosis

Slide4

Ametabola

Are a division of insects which are wingless and do not undergo any metamorphosis, but which hatch from the egg nearly in the same form they keep throughout their life. E.x. Apterygota (collembola)

Slide5

Hemimetabolism (incomplete metamorphosis)

Is a term used to describe the mode of development of certain insects that includes three distinct stages: the

egg

,

nymph

and the

adult stage

.

These groups go through gradual changes; there is no

pupal

stage.

The nymph often somewhat resembles the adult stage but lacks wings and functional reproductive organs.

E.x

.

Exopterygota

.

Slide6

Complete metamorphosis

The eggs hatch into larvae molt several times , turn to t pupa stage then to adult form. Each stage of the life cycle – egg, larva, pupa, and adult – looks different from the others. Entomologists call these insects holometabolous. Such as Endopterygot

Slide7

Insect eggs

Slide8

Insect

eggs

Insect eggs have various shapes. Some are conical, others are elliptical or hemispherical.

The egg covered with a shell or varying thickness color and shape.

Some eggs are laid singly in or plants, or in the soil, others laid in groups.

The eggs are enclosed in an outer egg case or

ootheca

.

Slide9

house fly

Slide10

American Cockroach egg cases

Slide11

Eggs of Culex

Slide12

Southern green stinkug, Nezara viridula

Slide13

Larva

The larva is the stage which hatch from eggs in insect with compleat metamorphosis. Larvae take different forms and is divided into three main types:

Polypod

Campodeiform

Apodous

Oligopod

Scarabaiform

Encephalous

Hemicephalous

Acephalous

Slide14

1-Polypod

It possesses 3 pairs of jointed legs (true legs) and numerous abdominal prolegs, with cylindrical body. Well-defined segmentation. Usually sluggish and live near there food. Order- Lepidoptera

Photo shows a caterpillar

Slide15

2- Oligopod

Presence of well-developed thoracic limbs. Pairs of abdominal cerci.

Photo shows a ladybird beetle larva

Slide16

There are two type of Oligopod

2-1-

Campodeiform

This type of larvae look elongated, flattened, predatory and active.

Well-

sclerotized

body, with

prognathous

head. Legs are long and not reduced, with a pair of terminal appendages.

E.x

. Order :

Neuroptera

Slide17

2-2-

Scarabaiform

Body soft, cylindrical and C- shape.

Thoracic legs, no

cadual

process or appendages.

Most of them move slowly.

It is commonly called "grub"

coleoptera

Slide18

3- Apodous

Larva with no legs and with reduced head that requires maternal care or deposition in or on food source.

Common in hymenoptera,

diptera

and some coleopteran

.

There are

three forms

of the larvae depends on the growth of head rings:

Slide19

Slide20

3-1- EncephalousWith well- sclerotized head capsule. E.x. Nematocera (Mosquito larvae)3-2- Hemicephalous With a reduced head capsule which can be retraced within the thorax. E.x. Tabanus Larva

Slide21

3-3- AcephalousWithout a head capsule. (Musca larva).

Slide22

Pupae

The

papae

is the resting inactive

instar

in all

holometabolous

insect.

During this stage the

unsect

is incapable of feeding and is quiescent. i.e., develops from the egg through the larva and the pupa stages to the adult.

The following types of pupae are recognized:

Slide23

Obtect

, the appendages are visible but they are closely glued to the body. The pupae is coverd with a tight- fitting transparent skin and only the posterior end of the abdomen is movable. E.x. Lepidoptera

Slide24

Exarate

, with the appendages free and not glued to the body; such as pupae of the Western honey bee. E.x. Hymenoptera

Slide25

Coarctate

, the appendages are not visibile. The pupae is enclosed in apuparium which is made from the last larval skin. Found in certain Diptera