Week 7: Lecture 9: Arthropods 2: Chelicerata Flashcards
Chelicera
claws/jaws/fangs
What is chelicerata?
a subphylum of the phylum arthropoda
Groups inc. in chelicerata
6
- horseshoe crabs
- scorpians
- spiders
- harvestmen
- mites
- ticks
Gas exchange in chelicerata
book lungs or trachea
How do book lungs work?
2
- air flows through a spiracle opening
- air flows between lamallae and blood (hemolymph) flows and extracts oxygen from it and transfers it to the rest of the body
Reproduction of chelicerata
sexual reproduction, separate sexes, usually indirect sperm transfer with a spermatophore
Parental care
sophisticated
Two classes of chelicerata
merostomata and arachnida
Class merostomata
horseshoe crabs
Antenna
appendage which comes from the top of the head
Pedipalp
jointed sensorial appendages which aren’t legs
Chelicerae
fangs
Class arachnida
body with waist separating the cephalothorax from the abdomen
Five orders within the class archanida
Opiliones Acari Scorpiones Solifugae Pseudoscorpiones
Order Opiliones (within the class arachnida within the subphylum chelicerata within the phylum arthropoda)
harvestment
Order acari (within the class arachnida within the subphylum chelicerata within the phylum arthropoda)
ticks and mites
Ticks
within the order acari,
they are ectoparasites
Mites
within the order acari,
they are herbivores and predators
Order Acari
(within the class arachnida within the subphylum chelicerata within the phylum arthropoda)
features
2
- body without waist and not visibly segmented
2. short legs
Order Opiliones
(within the class arachnida within the subphylum chelicerata within the phylum arthropoda)
features
- body without waist but visibily segmented
- long legs
- ocular tuberole
Ocular tuberole
lump w. eyes where should be
Order scorpioness
scorpians
Order Solifugae
sun spiders,
avoid light
Order pseusoscorpiones
pseudoscorpions
