Section 20.3- Arachnids, Centipedes, and Millipedes Flashcards
small insectlike arthropods
arachnids
examples of arachnids
spiders,
daddy longlegs,
mites and ticks
scorpions
body regions of a spider
cephalothorax (fused head and thorax)
abdomen
spiders have only ______________ eyes
simple
the four spiders in N American that have a harmful bite
two species of black widows
brown recluse
red widow
the thin waist of a spider that separates the cephalothorax and the abdomen of a spider’s exoskeleton
pedicel
a pair of short appendages that a spider uses to seize and to kill or crush its prey
chelicerae
have fangs that point inward and move in and out, crossing in the middle
true spiders
have fangs that point down and move up and down
mygalomorphs
the best known mygalomorph
tarantulas
located beneath the chelicerae and is designed for sucking liquids
mouth
an appendage that looks like a small leg, and is attached to each side of a spider’s mouth
pedipalp
purpose of the pedipalp
cut and crush food
a pad of hairs that surrounds the last leg segment
helps the spider cling to walls and ceilings
scopula
although most spiders are nearsighted, these two spiders have excellent eyesight
jumping spiders
wolf spiders
a spider has a _________________ stomach
sucking
where a spider’s digestion is completed its liquification and absorbed through the walls into the blood
intestine
is pale blue and contain many white blood cells
blood
a long, slender, muscular tube that pumps blood to the whole body
heart
a spider’s blood flows through _____________ in its body rather than through a ___________________ of blood vessels
open passages
closed system
a spider’s respiratory system consist of both
trachea and book lungs
located near the rear of the spider’s abdomen
where air enters through into the trachea
spiracles
a special protein in the spider’s blood that carries oxygen in the spider’s blood
hemocyanin
the organs that spiders use to spin silk
spinnerets
where the male places his sperm during mating
female’s seminal receptacle
the longest living of all spiders
tarantulas
a group of arachnids famous for their long, spindly legs
daddy longlegs or harvestmen
differences between spiders and daddy longlegs
- harvestman has no constriction (waist)
- harvestmen sense organs located on second pair of legs
- harvestmen have pincerlike chelicerae instead of fangs
- has only two simple eyes instead of 8
- lack spinnerets
- omnivores instead of just carnivores
arachnids found in most temperate climates and in all tropical climates
are most active at night and crawl into dark places
most prominent feature is tail
scorpion
all species of scorpions are either _______________________ or _____________
ovoviviparous
viviparous
arachnids that make up an order of tiny blood-sucking insects that parasitize both man and animals
mites and ticks
caterpillar-like creature that are often confused with each other, but have significant differences
centipedes and millipedes
characteristics of a centipede…
- flattened body
- pair of long antennas
- single pair of legs attached to each segment
- poisonous
characteristics of millipedes…
- rounded bodies
- short antennas
- harmless
- two pairs of legs per body segment
millipedes are saprophytes, which means
they feed on mostly dead and decaying plant materials
