non insect arthropods

exoskeleton

made up of cuticle and can be thick or membranous

sclerites

thicken plates of cuticle

dorsal - nota, ventral - sterna

notum

dorsal sclerite

sternum

ventral sclerite

spider

arachnid not insect

two main body parts and constriction

8 legs, pedipalps, ocelli

abdomen

opisthosoma

reproduces and poops

cephalothorax

in spiders

head end, mouth and sensory organs

all legs

constriction

waist connecting abdomen and cephalothorax

pedipalps

leg like appendages, jointed, feelers for touch sense

or can be large claws for grasping

ocelli

simple eyes, one lens

jumping spider

agile, good vision

able to move retina back and forth to focus - good eyes for predation

cannot actually change eye focal distance by changing shape

spinnerets

organs which produce silk, posterior end of abdomen

for webs, eggs, drag line, etc

chelicerae

fangs, can even be seen on exuviae

hollow to pierce and inject poison to digest and suck up whatever

tarantulas

slow moving, burrowers, not great vision

exuviae

shed exoskeleton

scorpions

arachnid

fluorescent under UV light (nocturnal?)

claw like pedipalps, segmented, stinger, abdomen, cephalothorax

mite

arachnid, huge diversity - food, habitat, etc

one body part, adults - 8 legs, larvae - 6

harvestman

one body part

8 legs, 2 pedipalps, ocelli, etc

millipede

neither insect, nor arachnid

2 pairs of legs on most segments

usually cylindrical in AB

produce hydrogen cyanide as defense chemicals

centipedes

neither insect, nor arachnid

one pair of legs per segment

only 3 cm ish long in AB, but get much larger

sow bug

isopod crustacean

one pair of legs per legged segment

scud

amphipod, typical aquatic crustacean

not shrimp