5: Arthropoda part 1 Flashcards
- biggest animal phylum
- jointed appendages
- body segmentation
- chitin exoskeleton/cuticle
- more widely
distributed than any other
eukaryotic phylum
arthropoda
interlinks proteins in outer layer
sclerotization
functional groups that arthropod segments combine into (head, thorax, abdomen)
tagmata
coelom reduced and takes this form for blood circulation
hemocoel
arthropods are ____; circulation is (closed/open?)
eucoelomate; open
insects and myriapods have a series of tracheae w openings called this
spiracles
arachnids have ____ while aquatic chelicerates have _____
book lungs; book gills
5 subphyla of arthropods:
trilobita
chelicerata
myriapoda
crustacea
hexapoda
arthropod subphyla:
- abundant during cambrian, ordovican
- extinct at end of permian
- lack true mouthparts
trilobita
arthropod subphyla:
- spiders, ticks, mites, scorpions, horseshoe crabs
- 4 pairs of walking legs
- cephalothorax + abdomen
- no antennae
chelicerata
chelicerata 2 pairs of appendages at the mouth
chelicerae, pedipalps
chelicerata class:
- horseshoe crabs
- 4 pairs of walking, 6 pairs of abdominal legs
- respire w book gills
xiphosurida
long tailpiece in unsegmented, horseshoe-shaped carapace in xiphosurida
telson
chelicerata class:
- scorpions, ticks, spiders
- breathe w book lungs
- most predatory
arachnida
order araneae have an excretory system composed of this; only spiders and insects have these
malpighian tubules
2-3 pairs of spinnerets run to abdominal _____ _____
silk glands
3 highly venomous spiders
black widow
brown recluse
funnel web spiders
order in arachnida:
- scorpions
- 3 tagmata: cephalothorax, preabdomen, postabdomen
- final segment of postabdomen modified into stinger
order scorpiones
order in arachnida:
- ticks, mites
- cephalothorax and abdomen completely fused
order acari
ticks and mites: mange in dogs and cats
Demodex
ticks and mites: carrier of Lyme disease
Ixodes
ticks and mites: causes scabies
Sarcoptes scabiei
arthropod subphyla:
- centipedes, millipedes
- 2 tagmata: head, trunk
- terrestrial; prefer humid enviro
myriapoda
myriapoda class:
- somewhat flattened
- prefer moist places
- all carnivorous
- one pair of legs per trunk segment
chilopoda
myriapoda class:
- cylindrical body
- herbivorous
- each trunk segment has 2 pairs of legs
diplopoda
