Chapter 4 Page 1 Flashcards
Common features in most ARTHROPODS:
- Coelom (Hemocoel is primary body cavity)
- Hardened chitinous exoskeleton (cuticle)
- Moulting (ecdysis) of exoskeleton to allow growth
- Foregut and hindgut lined with cuticle
- Jointed Appendages
- Specialised body segments and appendages that interact with bundles of muscles
- Compound eyes
- Metamorphosis
Phylum Chelicerata: 3 classes
Class Merostomata
Class Arachnida
Class Pycnogonida
Class Merostomata:
Contains (Horseshoe ‘crabs’)
Class Arachnida:
contains scorpions, spiders, ticks, and mites
Class Pycnogonida:
contains the sea ‘spiders’
***From a parasitological perspective, the most important members of the Chelicerata are the ____.
ACARI.**
**This includes the organisms that are commonly known as the
mites, ticks, and chiggers
**The Acari are also sometimes referred to as the ____ and the study of the Acari is known as _______.
‘Acarina’
‘Acarology.’
Largest Acari only reach about 2 cm in length:
There size is based on the large quantities of their host’s blood that was ingested.
Acari Lifestyle:
Feed by ingesting fluids (Mouthparts are adapted for this purpose)
Mouthpart called
chelicerae
Chelicerae Characteristic
Pincer-like
needle-like
while their pedipalps (2nd pair of appendages) take the form of pincer-like appendages.
2 body divisions that are fused together (difficult to see division)
Prosoma
Opisthosoma
Acari lifecycle: After mating: female lays eggs that hatch to release
6-legged larvae.
Acari lifecycle: Eggs are laid in a location OR
some species have eggs that are retained(to continue to have that thing) in the female body until they hatch.
