Lifecycles And Internal Anatomy Hummel

Lifecycles Insect Internal Anatomy Dr. Natalie Hummel, LSU AgCenter Department of Entomology E-mail: [email_address] 9:45 to 10:15

Hemi-metabolous Hemi = partial -metabolous = change Incomplete development Larva looks similar to adult Egg Nymph Adult

Chinch Bug J. Saichuk Aphids – a variation on this… Amorochrous dubius Rice Stink Bug J. Saichuk

Holo-metabolous Holo = complete -metabolous = change Complete development Larva looks different from adult Rice Water Weevil Egg Larva Adult Pupa

Colaspis Rice water weevil J. Saichuk J. Saichuk SARM Skippers J. Saichuk J. Saichuk J. Saichuk Fall Armyworm Rice Leafminer J. Saichuk J. Saichuk Rice Levee Bill Bug Rice Seed Midge J. Saichuk

J. Saichuk J. Saichuk

R. Riggio

R. Riggio Feeding site Head

J. Saichuk J. Saichuk Puparia

A. Meszaros

J. Saichuk

Internal Anatomy

The Nervous System Allows the insect to interact with the environment Figure source Peng, UC Dacvis

The Brain
Processes information
Protocerebrum
Vision
Deutocerebrum
Olfaction
Tritocerebrum
Feeding
Figure source Chapman, 1998

How do Insects Sense the Environment? Tarsal receptors are activated Action potential occurs Message is sent to brain Feeding commences Figure source Peng, UC Dacvis

Circulates blood & hormones
Hemolymph
Plasma ~ blood
Hemocytes ~ blood cells
Trehalose ~ blood sugar
Pump (heart & dorsal aorta)
Diaphrams (Dorsal & Ventral )
Neurohormones control
The Insect Circulatory System Figure from Chapman, 1998

Figure from Chapman, 1998

Endocrine System - Hormones
Growth (molting)
Reproduction
Feeding
Mating
trw.umbc.edu/~vergil/Pix/insects.html trw.umbc.edu/~vergil/Pix/insects.html

Reproductive tract http://images.google.com/imgres?imgurl=http://www.entomology.umn.edu/cues/4015/morpology/repro.jpg&imgrefurl=http://www.entomology.umn.edu/cues/4015/morpology/&usg=__JKdknStXraJP7-iF8w7zM5yjwS0=&h=375&w=594&sz=73&hl=en&start=6&sig2=RCZAkgjMqgh1q3MOzNewXA&um=1&itbs=1&tbnid=FFA3R1-4npnjNM:&tbnh=85&tbnw=135&prev=/images%3Fq%3Dinsect%2Breproductive%2Btract%26um%3D1%26hl%3Den%26client%3Dfirefox-a%26sa%3DG%26rls%3Dorg.mozilla:en-US:official%26tbs%3Disch:1&ei=t6aGS9KhAaWKNbmozfAL

Digestive tract http://www.earthlife.net/insects/images/anatomy/guts.gif

The Big Picture – Endocrine system Figure source Peng, UC Dacvis

The Insect Tracheal System
Oxygen & waste products to & from each cell
Tracheal system
Spiracles
Trachea
Taenidia
Tracheoles
Tracheolar cells
Figure Snodgrass, 1935

Figure Snodgrass, 1935

http://www.nature.com/nrg/journal/v1/n3/images/nrg1200-218a-f4.jpg

References
Chapman, R.F. 1998. The Insects: Structure and Function. Cambridge University Press. NY, NY USA.
Snodgrass, 1935. Principles of Insect Morphology
Online resources, as cited in slides.
Peng, C.Y.S. Insect Physiology Lab Manual.

Lifecycles And Internal Anatomy Hummel

by Natalie Hummel on Mar 05, 2010

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Lifecycles And Internal Anatomy Hummel Presentation Transcript