Test 3-Class Merostomata

Question 1

-stoma

Answer 1

mouth

Question 2

Meros-

Answer 2

thigh

Question 3

Subclasses

Answer 3

Eurypterida (giant sea scorpions, now extinct)

Xiphosurida (horseshoe crabs)

Question 4

Appendages

Answer 4

5 pairs of legs (10 total) for walking

one set of pinchers to push food into their mouths

Question 5

Circulatory System

Answer 5

open

Question 6

Body segments

Answer 6

prosoma, cephalothorax (head/thorax), opisthosoma (abdomen) tesla (tail) (swim upside down)

Question 7

Hard upper shell

Answer 7

thick, horseshoe shaped carapace

covers the prosoma

Question 8

Respiratory System

Answer 8

book gills on appendages behind last pair of legs

Question 9

Eyes

Answer 9

2 compound eyes
2 simple eyes
6 other light sensors

Question 10

Living fossils

Answer 10

haven’t changed for millions of years

Question 11

Mouth

Answer 11

at the center of the prosoma and legs

eat sea worms, mollusks, small crustaceans

Question 12

Blue Blood

Answer 12

because of the copper

Question 13

Environment or Habitat

Answer 13

marine

Question 14

Life Cycle

Answer 14

come to shore to reproduce
oviparous
external fertilization process (pseudocopulation)

Question 15

Adults

Answer 15

molt once a year

takes 8-10 years to reach adulthood

Question 16

Males and Females

Answer 16

Male-first set of claws are thick

Female-first set of claws look like the rest, normally larger

Question 17

Importance to humans

Answer 17

eggs for food (food chain)
bait
blood clumps immediately in the presence of bacteria (testing)

Question 18

Complexity

Answer 18

moderate

Question 19

Other facts

Answer 19

adults can go months without eating
can breathe on land for days as long as gills are wet
swim upside down