Aquatic Mandibulates

Question 1

(Subphylum Crustacea) Are the…

Answer 1

Aquatic arthropods

Question 2

Mandibles are jaw like appendages that…

Answer 2

Crush food

Question 3

_________: food handling; moving water across gills

Answer 3

Maxillae

Question 4

_________: touch, taste; equilibrium organs @ base (________)

Answer 4

Antennae, statocysts

Question 5

________: one or more of the thorax segments are fused with the head, covered w/ a single plate of exoskeleton (_______) w/ MANY specialized appendages

Answer 5

Cephalothorax, carapace

Question 6

__________: w/ one pair of appendages per segment (in ________ & ________)

Answer 6

Abdomen, Malacostraca, Remipedia

Question 7

Appendages originally _________ but have become modified w/ branches functioning as gill, tactile structures & etc.

Answer 7

Biramous

Question 8

_________: long, thin; sensory feeling in murky habitat.

Answer 8

Antennae

Question 9

________: jaw, broad; cutting surface.

Answer 9

Mandible

Question 10

________: flat, broad, paddle shaped; used for food handling.

Answer 10

Maxilla

Question 11

“________” more leg shaped; multi-purpose; _____ attached to most.

Answer 11

Peds, gills

Question 12

Swimmerets: ________; _______; female has opening in the _______ of abdomen where male delivers sperm packet. Female holds packet until ready for ________.

Answer 12

Reproductive, dimorphic, middle, fertilization

Question 13

Body Arrangement: __________ (annelids & mollusks too) but most space is ________ & what remains forms ________ or _______.

Answer 13

Schizocoelous coelomate, filled in, blood sinuses, hemocoel

Question 14

Muscular System: _______ muscles now arranged in pairs whose actions oppose each other (________).

Answer 14

Skeletal, antagonistic

Question 15

________ draw the part toward the body.

Answer 15

Flexors

Question 16

________ pull the part away.

Answer 16

Extensors

Question 17

Smaller crustaceans exchange gases through ___________ of the ________ (usually on the _______)

Answer 17

Thinner regions, exoskeleton, limbs

Question 18

Larger crustaceans use gills (attached to ___________) that project up under the carapace w/in the “________”; water is directed into this space by the 2nd maxilla (the “______”).

Answer 18

Thoracic legs, gill cavity, bailer

Question 19

Circulatory System: retains the ________ circulation of the terrestrial arthropods w/ _______ heart that blood enters from the __________ and then is pumped back to the body’s __________.

Answer 19

Open, dorsal, gill spaces, blood sinuses

Question 20

Excretory System: paired (______) glands sit in _________, filter wastes from blood and dump wastes out openings in _________.

Answer 20

green, blood sinuses, exoskeleton

Question 21

_______ brain which meets under ________ to form the _______ nerve cord.

Answer 21

Dorsal, esophagus, double ventral

Question 22

___________ abundant on chelipeds, mouthparts & telson.

Answer 22

Tactile hairs

Question 23

________ at base of antennae w/ tiny grains whose movements are detected by hairs inside send info to the brain about ________.

Answer 23

Statocysts, body position

Question 24

Eyes are ________ - composed of smaller units called ________ under a cornea surface.

Answer 24

Compound, ommatidia

Question 25

Metamorphosis involves several ________ including a larvae (______) and the addition of appendages & segments in later stages.

Answer 25

Molts, naupilus

Question 26

Molting is the process of making a larger cuticle by secretion of _______ and _______ from the _______ below it.

Answer 26

Proteins, chitin, epidermis

Question 27

_________ occurs once the attachment of the old cuticle to the epidermis has been severed; the animal swells up & splits the old exoskeleton so it can extract itself.

Answer 27

Ecdysis

Question 28

_________ feeders use setae to sweep food in towards mouth.

Answer 28

Suspension

Question 29

Predators and Scavengers use a _______ stomach where _________ in the ________ grind food , then pass it through a _______ into the second part of the stomach then into the intestines for chemical digestion.

Answer 29

Two part, calcareous teeth, gastric mill, sieve