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