Hexapoda


Hexapoda synapomorphies:
3 tagmata
1 pair of antennae
6 legs with 6 segments each
Abdomen with 11 segments
2 primary pigment cells per ommatidia
0, 1 or 2 pair of wings
Epimorphosis

Entognatha synapomorphies:
Mouth parts not showing
Lacks ommatidia
Malphigian tubule system reduced

Elliplura (Collembola + Protura) synapomorphy:
Linea ventralis

Collembola
Springtail
Synapomorphies:
Furculum (tail-like appendage used for jumping)
Collophore (tube-like structure near linea ventralis)
Spiracles reduced

Protura
Conehead
Synapomorphies:
Front legs increased in size (serves as antennae)
Small styli on abdomen

Diplura
Two-pronged bristle tail
Synapomorphies:
Very flexible legs
Lacks eyes