|
ORDER |
SYNAPOMORPHIES |
| Chilopoda |
- embryonic cuticle of the second maxilla bears
an egg tooth, which allows the pupa to escape during hatching
- first pair of walking legs modified into
a clawlike appendage, housing a poison gland near its tip and
used to capture prey
- second segment (trochanter) of trunk legs
is ring-like, leading to lack of mobility at the joint with the
prefemur
- nucleus of the spermatozoan has a spiral
ridge
|
| Symphyla |
- anterior respiratory system with a single
pair of spiracles on the lateral sides of the head capsule
- absence of eyes or any visual sensory organs
- labium with outer sensory cones
- female spermathecae (sac used to contain
spermatozoa) formed by paired lateral pockets in the mouth cavity
- an unpaired genital opening
- pair of silk-producing spinnerets on terminal
segment
- anal segment with a pair of large sense calicles
(trichobothria), each with a long sensory seta
|
| Pauropoda |
- branched antennae with a special sensory
organ, the globulus
- eyes reduced to paired sensory spots (pseudoculi)
on lateral sides of the head capsule
- exsertile vesicles on the ventral side of
the first postcephalic segment - these can be protruded
- trichobothria at margins of the tergites
|
| Diplopoda |
- pairs of metameres fused into diplosegments
- antenna with eight articles, the distal article
bearing apical sensory cones (primitively four cones)
- immotile, aflagellate spermatozoa
|
