Biology Chapter 20: Section 20.3

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20 Terms

1
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spiders and daddy longlegs, mites and ticks, and scorpions (small, insect-like arthropods) (eight legs)

arachnids

2
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how many distinct regions of the body do spiders have?

2

3
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a fused head and thorax

cephalothorax

4
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what kind of eyes do spiders have?

simple eyes

5
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a pair of short appendages; either of two special front legs of a spider that often function as fangs.

chelicerae

6
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spiders that attack only when they are hurt or frightened

black widow, brown recluse, and red widow

7
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have fangs that point inward and move in and out, crossing in the middle

true spiders

8
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have fangs that point down and move up and down

tarantulas

9
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designed for sucking liquids

spider mouth

10
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an appendage that looks like a small leg, is attached to each side of a spider’s mouth

pedipalp

11
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helps the spider cling to walls and ceilings

scopular

12
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the organs that the spider uses to spin silk

spinnerets

13
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hatch inside the silken cocoon and remain inside until the arrival of warm weather

spiderlings

14
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longest-lived of all spiders

tarantulas

15
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(harvestmen) a group of arachnids famous for their long, spindly legs

daddy longlegs

16
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found in most temperate climates and in all tropical climates (can be ovoviviparous and viviparous); has a stinger

scorpions

17
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make up an order of tiny blood-sucking arachnids that parasitize both man and animals

mites and ticks

18
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caterpillar-like creatures

centipedes and millipedes

19
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flattened body, a pair of long, jointed antennae, venomous, a single pair of legs attached to each of its body segments

centipedes

20
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rounded bodies, shorter antennae, harmless, have two pairs of legs per segment

millipedes