Phylum Arthropoda (specifics)
~ - tagmosis: fusion of metameric body plan into functional units
- growth by molding termed ecdysis
- functional cilia absent (except sperm in some)
- cuticle forms a rigid exoskeleton
Class Hexapoda (specifics)
~ - ph. Arthropoda, sub uniramia
- speciali...
- body segmented internally and externally (joint appendages)
- open circulatory system: hemocoel (blood can leave vessels and go back in)
- gut complete, well dvlp
- usually pair of compound eyes (ommatidia)
Subphylum Trilobitomorpha
✓~ - marine arthropods; extinct
- body made of distinct head (cephalon)
-- fused to the posterior portion of the body (pygidium)
- head bears antennae
- 2 well dvlp eyes (look compound based on fossils)
,- 4 pairs of appendages
Subphylum Uniramia (morph)
✓~ - ph. arthro.
- body composed of 3 tagmata
- all appendages multi articulated and uniramous
- head w/ antennae, mandibles, and various numbers of feeding appendages
- mandibles are whole limb jaws w a single biting surface
- compound eyes w ocelli in most
Subphylum Uniramia (systems)
✓~ - gas exchange by tracheal system with spiracles (openings in body that let gases
in/out)
- Malpighian tubules for excretion
- dioecious
Subclass Chilopoda
, ✓~ - ph. arthro, sub uniramia, class myriapoda
- centipedes
- 1 leg per somite; 15-174 pairs
- poison claws
- predaceous (active predators)
Subclass diplopoda
✓~ - ph. arthro, sub uniramia, class myriapoda
- millipedes
- 2 legs per somite
- produce hydrocyanic acid -- warning coloration common
- slow moving, herbaceous scavengers
Class hexapoda (generic)
✓~ - ph arthro, sub uniramia
- insects
- open circulatory syst
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