Post on 03-Jun-2015
description
Lifecycles
Insect Internal Anatomy
Dr. Natalie Hummel, LSU AgCenter Department of Entomology
E-mail: nhummel@agcenter.lsu.edu
9:45 to 10:15
Hemi-metabolousHemi = partial
-metabolous = changeIncomplete development
Larva looks similar to adult
Egg Nymph Adult
Chinch Bug
J. Saichuk
Rice Stink Bug
J. Saichuk
Aphids – a variation on this…
Amorochrous dubius
Holo-metabolousHolo = complete
-metabolous = changeComplete development
Larva looks different from adultRice Water Weevil
Egg Larva AdultPupa
J. Saichuk
Fall Armyworm
Rice Leafminer
J. Saichuk
J. Saichuk
Rice Levee Bill Bug
ColaspisColaspis
Rice water weevilRice Seed Midge
J. SaichukJ. Saichuk
J. Saichuk
SARMSkippersSkippers
J. Saichuk J. Saichuk
J. SaichukJ. Saichuk
R. Riggio
Feeding site
Head
R. Riggio
J. Saichuk
Puparia
J. Saichuk
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
The Insect Circulatory System
• Circulates blood & hormones
• Hemolymph–Plasma ~ blood–Hemocytes ~ blood cells– Trehalose ~ blood sugar
• Pump (heart & dorsal aorta)• Diaphrams (Dorsal & Ventral )• Neurohormones control
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.