Phylum Arthropoda Insects. Subphylum Hexapoda Class Parainsecta Class Insecta.
Subclass Hexapoda
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Transcript of Subclass Hexapoda
SUBCLASS HEXAPODAGOTTA CATCH ‘EM ALL!
PRE-ASSESSMENT!
GIVE 5 SPECIES OF HEXAPODA
GIVE SOME CHARACTERISTICS OF HEXAPODA
GIVE 3 ORDERS OF HEXAPODA
WHICH OF THE FOLLOWING DO NOT BELONG TO THE
GROUP?
FOR EXCRETION IN HEXAPODA
M NGPB E S
SUBCLASS HEXAPODA
GENERALCHARACTERISTICSBY: PAULA MARIE M LLIDO
INTERNAL TRANSPORT HEMAL SYSTEM Heart, accessory heart,
hemocoel, and blood 9 abdominal
segment, perforated by 1 to 12 pairs of segmental ostia
Forward beating – head Backward beating – abdomen
Many survives subfreezing temperatures by accumulating glycerol, sorbitol, and trehalose in the blood which depress freezing point and function as anti-freeze
Permitted ice crystals to form in desired body location
A New Zealand insect called the Weta freezes completely solid during winter. When the temps go up, it resumes its
business.
GAS EXCHANGE ATMOSPHERE –
SPIRACLE – TISSUE Longitudinal tracheal
trunks - branch to the heart, nerve cord, muscles and gut
Closing spiracles reduces water loss and filtering prevents entry of dust and parasites
Taenidia – allow trachea to expand, but prevent its collapse
Tracheoles
Use tracheae to carry respiratory gassesChitin-lined invaginations of epithelium
Open to the outside via spiracles
Tracheal cuticle is shed during molting
Gas movement in trachea – simple diffusion and muscular ventilation
Aquatic – CLOSED TRACHEAL SYSTEM (w/o Spiracle) – air-filled trachea arise in tracheal gills (filamentous)
Aquatic larvae has open tracheal system - 2 spiracles at end of breathing tube .
Aquatic adults go to surface
EXCRETION
Excretion by Malpighian tubulesAlmost all insects, some myriapods, some spidersBlind-ended tubules bathed in hemolymph
Remove nitrogenous waste (e.g. uric acid), amino acids, sugars
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Excretion by Malpighian tubulesMinerals, water resorbed at bottom of tubule and by rectal glands of hindgut
waste passed out
NERVOUS SYSTEM
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SENSE ORGANHead pair of compound eyes (detect
movement) several sets of simple eyes= ocelli
(probably detect changes in light intensity) Mosquito compound eye
Fly tastes food by walking on it
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Bitterness kills: Two new studies revealed that suppressing the ability to taste food - regardless of how much is actually eaten - can increase or decrease how long fruit flies live. Bitter tastes cut the insect's life expectancy, while sweet tastes extended itRead more: http://www.dailymail.co.uk/sciencetech/article-2632862/Can-TASTE-BUDS-determine-long-youll-live-Study-finds-losing-ability-identify-foods-boost-life-expectancy.html#ixzz4Jbc4Ejyp Follow us: @MailOnline on Twitter | DailyMail on Facebook
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HeadAntennae can
be highly variable
Mosquito antennae
REPRODUCTIONFEMALE REPRODUCTION MALE REPRODUCTION
The larger drone bees, the males, do not have stingers. The female worker bees
are the only ones that can sting, and their stinger is a modified ovipositor. The queen bee has a smooth stinger and can,
if need be, sting skin-bearing creatures multiple times, but the queen does not leave the hive under normal conditions.
When a honey bee stings a person, it cannot pull the barbed stinger back out. It
leaves behind not only the stinger, but also part of its abdomen and digestive tract, plus muscles and nerves. This massive abdominal rupture kills the
honey bee. Honey bees are the only species of bees to die after stinging