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Hexapod Phylogeny
Proposed phylogeny of hexapods 2012
11
Biology
Undergraduate 1
09/07/2012

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Term
Non-insect hexapods (Entognatha) include three orders:
Definition
1. Collembola- springtails
2. Protura
3. Diplura
Term
What 4 traits separate Insecta from Hexapoda?
Definition
1. Antennomeres without muscles
2. Tentorium- internal skeleton in head
3. Tarsal claws
4. Cervical (neck) sclerites
Term
What differentiates Archaeognatha from Zygentoma?
Definition
Archeognatha have monocondylic mandibles (only one contact area), while Zygentoma have dicondylic mandibles (two areas of contact)
Term
_____ developed with Pterygota
Definition
Wings
Term
Ephemeroptera and Odonata are excluded from Neoptera and are instead referred to as Palaeoptera because:
Definition
Their wings cannot fold flat over their back like is found in Neoptera.
Term
Polyneoptera are defined as having 2 distinct features:
Definition
1. Hind wings have enlarged vannal area
2. A pair of segmented abdominal cerci
Term
Polyneoptera includes the following 10 (11) orders, in sequence of relatedness:
Definition
1. Plecoptera
2. Dermaptera
3. Embioptera
4. Zoraptera
5. Orthoptera
6. Phasmatodea
7. Grylloblattodea
8. Mantophasmatodea
9. Mantodea
10. Blattodea (cockroaches)
11. Blattodea (termites)
Term
3 traits of Paraneoptera:
Definition
1. Most with piercing mouthparts folded back under the head
2. No cerci
3. No vannal area of wing
Term
Paraneoptera includes the following 3 (4) orders:
Definition
1. Psocodea (free-living)
2. Psocodea (parasitic)
3. Thysanoptera
4. Hemiptera
Term
Endopterygotes are always:
Definition
Holometabolous, including a pupal stage, and the development of wings inside the body (no visible juvenile wing pads)
Term
Endopterygotes include the following 11 orders:
Definition
1. Neuroptera
2. Megaloptera
3. Raphidioptera
4. Coleoptera
5. Strepsiptera
6. Diptera
7. Mecoptera
8. Siphonaptera
9. Trichoptera
10. Lepidoptera
11. Hymenoptera
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