Phylum Mollusca, Deuterostomia: Phylum Echinodermata & Chordata

Question 1

Phylum Mollusca characteristics

Answer 1

bilateral, triploblastic, coelomate, open gut
she’ll (if present) = calcium carbonate

Question 2

Larval form of Molluses

Answer 2

trochophore larval form

Question 3

Foot

Answer 3

muscular structure of phylum mollusca

Question 4

Mantle

Answer 4

secretes shell if present in phylum mollusca

Question 5

Visceral Organs

Answer 5

internal structures of phylum mollusca

Question 6

*Radula

Answer 6

rasp like feeding structure of phylum mollusca

Question 7

Class Polyplacophora

Answer 7

“chitons”, shell made of calcium carbonate, lives in boundary layer (bottom of floor)
Phylum Mollusca

Question 8

Class Gastropoda

Answer 8

“snails, slugs”, some undergo torsion = twisting body 180° relative to head, adaptation to predation
Phylum Mollusca

Question 9

Class Bivalvia

Answer 9

“clams, oysters, scallops”, bi = two, valvia = shell
filter feeders: active pumping of water
Phylum Mollusca

Question 10

Larva of Class Bivalvia

Answer 10

glochidia larvae: attach to gills of fish

Question 11

Class Cephalopoda

Answer 11

“squid, octopus, cuttlefish, nautilus”
very advanced sensory abilities/behaviors
cephalopods = head foot

Question 12

Deuterostomia

Answer 12

radial, indeterminate
phylum Echinodermata & Chordata

Question 13

Phylum Echinodermata

Answer 13

“sea stars, urchins, crinoids, sea cucumbers”
bilateral, triploblastic, coelomate, open gut

Question 14

Vascular System of Phylum Echinodermata

Answer 14

Water vascular system- hydraulic system for movement

Question 15

Class Asteroidea

Answer 15

“sea stars”, *keystone predators
Phylum Echinodermata

Question 16

Class Ophiuroidea

Answer 16

“brittle stars”- scavengers
“basket stars”- suspension feeders
Phylum Echinodermata

Question 17

Class Echinoidea

Answer 17

“urchins”- herbivores
“sand dollars”
Phylum Echinodermata

Question 18

Class Crinoidea

Answer 18

“sea lilies” / “feather star”
deep sea suspension feeders
Phylum Echinodermata

Question 19

Class Holothuroidea

Answer 19

“sea cucumbers”- scavengers
important for corals
Phylum Echinodermata

Question 20

4 Traits of Phylum Chordata

Answer 20

•dorsal, hollow nerve cord
•pharyngeal slits/clefts
•muscular, post-anal tail
•notochord

Question 21

2 Primitive Subphyla of Chordata

Answer 21

Cephalochordata: “lancelets”
Urochordata: “tunicates”/“sea squirts”