subphylum chelicerata

Question 1

9 orders of chelicerata:
7 are arachnids, 2 are not.

Answer 1

acari
aranae
opilliones
solifugae
uropygi
pseudoscorpiones
scorpiones
xiphosura (not )
pycnogonida (not)

Question 2

generally, chelicerata have ___ tagma with the exception of:

Answer 2

2; scorpiones

Question 3

compared to other arthropods, chelicerata have lost _____ and _____.

Answer 3

antennae and antennules

Question 4

the main sensory organ of chelicerates is:

Answer 4

legs! often called pleopods

Question 5

acari includes:

Answer 5

ticks and mites, includes scabies, chiggers, facial mites

Question 6

the tarsal sense organ on acari is called _____ and located ____

Answer 6

Haller’s organs; first leg

Question 7

do acari have fused tagma or distinct?

Answer 7

fused

Question 8

acari generally are ____ feeders. however some are free-living and eat:

Answer 8

fluid/parasitic; detritus or other mites

Question 9

aranae commonly are called:

Answer 9

spiders :D

Question 10

aranae are known for a unique organ on their butt called _______ and this has many uses:

Answer 10

spineret; silk production! for making homes, catching food, protection from predators, cocoons/egg laying, parachutes for floating in the air

Question 11

aranae tagma fused or distinct?

Answer 11

distinct! prosoma and opisthoma are separated by a skinny pedicel

Question 12

what do aranae have on their mouth that differentiates them from most other chelicerae groups?

Answer 12

poison fangs used for prey capture and digestion

Question 13

aranae are terrestrial, so their respiration is through:

Answer 13

book lungs

Question 14

what kind of feeder is aranae?

Answer 14

“aerial filter feeders” predatorial, catch flying insects, some eat seeds as well

Question 15

opilliones are commonly called:

Answer 15

daddy longlegs or harvestman

Question 16

opilliones vs aranae:

Answer 16

opilliones: no poison fangs, fused tagma, no spinerets/webs, no pedicel, males have a penis, use chelicerae for feeding
both have book lungs

Question 17

opilliones are ____ feeders:

Answer 17

predatorial! and fast

Question 18

pseudoscorpiones are actually kinda similar to aranae. how?

Answer 18

they have spinerets and venome glands. except! silk glands are in the head.

Question 19

pseudoscorpiones vs scorpiones

Answer 19

pseudo: TINY (max 7mm), 2 tagma, live in tree bark or leaf litter

scorpiones: larger, 3 tagma, aculeus stinger, live in tropical regions on ground

both have claw-like chelicerae and pedipalps modified into large claws

Question 20

uropygi are commonly called:

Answer 20

whip scorpions/vinegaroons, whip spiders

Question 21

uropygi’s first set of legs are:

Answer 21

modified into long sensory structures

Question 22

although uropygi are sometimes whip spiders, they differ from aranae because:

Answer 22

they lack spinerets/silk and venom

Question 23

why are uropygi called vinegaroons?

Answer 23

they have posterior defensive glands which can shoot acetic acid/formic acid/chlorine at predators

Question 24

solifugae are commonly called:

Answer 24

sun spiders, camel spiders, wind spiders

Question 25

solifugae are somtimes called spiders, but they differ from aranae in that:

Answer 25

they lack venom and spinerets/silk and are active during the day

Question 26

uropygi, solifugae, scorpiones, pseudoscorpiones, opilliones, acaru, xiphosura, and pcynogonida (all except aranae) have chelicerae that are:

Answer 26

claw-like

Question 27

only class of chelicerata that do not have claw-like chelicerae are:

Answer 27

aranae

Question 28

xiphosura are most commonly called

Answer 28

horseshoe crabs

Question 29

xiphosura are special evolutionarily because:

Answer 29

they have been around for 500 million years

Question 30

xiphosura blood:

Answer 30

biomedical, clots rapidly if it comes into contact with bacteria and bacterial toxins, used to test for purity in medicine

Question 31

xiphosura populations in decline because:

Answer 31

blood used for medicine, hunted as fish bait, trawling methods, habitat loss

Question 32

xiphosura blood is called:

Answer 32

haemolymph

Question 33

males vs females xiphosura

Answer 33

males are clubbed pedipalps , females are piercer like pedipalps. also, females tend to be larger.

Question 34

xiphosura mate:

Answer 34

at high tide on shoreline at full moon

Question 35

pycnogonida are commonly called:

Answer 35

no-bodies, or knobby knees

Question 36

pycnogonida have another structure besides chelicerae for feeding:

Answer 36

proboscis to suck out the fluid of cnidaria, bryozoa, porifera

Question 37

pycnogonida body is so small that:

Answer 37

reproductive organs are forced into legs

Question 38

pycnogonida body is:

Answer 38

very reduced, 3-6 pairs of long spindly legs.