Phylum Arthropoda Flashcards
0
Q
Exoskeleton
A
- made of chitin (or calcium carbonate in marine species)
- doesn’t grow… Must be shed
- covered in waxy coating to preserve water
- protects organs and is place for muscles to attach to
1
Q
Appendages
A
- characterized by jointed legs/appendages
- appendage: moveable sections of the body
- appendages modified for feeding, breathing, flying
2
Q
Basic info;
A
- most diverse group of taxa
- bilateral symmetry
- true coelom
- complete digestive system
- protostomes (develop mouth-first)
3
Q
Growth
A
- moulting is aka ecdysis
- dangerous… Left exposed
- fills with air or fluid after moulting to make itself bigger until new exoskeleton hardens
4
Q
Movement
A
- all types of movement, though some are sessile (barnacle)
- muscles work in pairs & are well-developed
5
Q
Respiration
A
- Tracheal tubes and spiracles in terrestrial
- feather or book gills in aquatic
6
Q
Digestive system
A
- foregut: ingestion, mechanical breakdown, storAge
- midgut: digestion & absorption
- hind gut: water absorption & feces making
- out pockets increase surface area for digestion&absorption
7
Q
Reproduction
A
- separate sexes
- sexual reproduction (internal for terrestrial, external for aquatic)
- mostly eggs, though some bear live young
8
Q
Circulation
A
- open circulatory system
- haemocoel: series of blood spaces that bathe the organs
9
Q
Excretion
A
- malpighean tubules extract waste from blood and adds it to feces
- diffusion for aquatics
10
Q
Response to environment
A
- brain and nerve cord
- ganglia
- sensory bristles
- stratocysts
- chemical receptors for smell
- sophisticated senses, eyes, taste, hearing
- tympanic membrane & auditory hairs in insects
11
Q
Eyes
A
- compound eye: many visual units called facets, colour vision, detecting slight movements
- simple eye: few photoreceptors form crude images
12
Q
Chelicerata
A
- 6 appendages (4 legs)
- Arachnida ( spiders, ticks, mites, scorpions)
- mouthparts/fangs: chelicerae
- no antennae
- pedipalps: grab prey
- spinnerets produce silk
13
Q
Uniramia
A
- largest
- one antennae
- one or two maxillae (upper jaws)
- one pair mandibles (lower jaws)
- respiration through trachea, body surface, and gills
14
Q
Class Diplopoda
A
- millipedes
- 2 pairs of legs/segment
- detritivores
- roll into ball & secrete toxic chemicals for Defense
