Classification of Living Hexapod Orders

1. Classification of Living Hexapod Orders Class Hexapoda (“six-legged” animals) • “Entognatha” (entognathous apterygotes) (3 orders) • Protura, Collembola, Diplura • Insecta(“ectognatha” or insects) (28 orders) • Some characters of the Insecta: • ectognathous mouthparts • only 3 musculated antennal segments • multi-segmented tarsi • well-developed compound eyes • tentorium present • “Apterygota” (ectognathous apterygote) (2 orders) • Microcoryphia (=Archaeognatha) • Thysanura

2. Order Microcoryphia

3. Microcoryphia (head) eyes, contiguous dorsally lateral ocellus median ocellus • antennae prominent • eyes large • ocelli present • mouthparts ectognathous

4. Microcoryphia (head) monocondylic mandibles • Protura • Collembola • Diplura • Microcoryphia dicondylic mandibles • all other hexapod orders 2 condyles 1 condyle

5. Microcoryphia (thorax) • wings absent • thorax strongly arched • legs cursorial coxal stylus tarsus 2-3segmented

6. Microcoryphia (abdomen) sternite • 10 segmented • styli present • exsertile vesicles usually present • median caudal filament present • cerci present coxa stylus exsertile vesicles median caudal filament cercus

7. Microcoryphia (abdomen) cercus median caudal filament gonapophysis 8 gonocoxite 8 gonapophysis 9 gonocoxite 9 female ovipositor structures

8. Microcoryphia (biology/ecology)

9. Microcoryphia (biology/ecology)

10. Order Microcoryphia

11. Microcoryphia (fauna) • World Fauna • 2 families • ca. 350 species • North American Fauna • 2 families • Machilidae (lab) • Meinertellidae • ca. 20 species

12. Order Microcoryphia FINIS

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