Phylum Characteristics

Question 1

Phylum Porifera unique characteristic

Answer 1

spongin: collagen protein that makes up skeleton

osculum: large opening of sponge

Ostia: small holes in sponge

Question 2

Phylum Cnidaria unique characteristic (jellyfish, anemones, coral)

Answer 2

cnidocytes (stinging cells)

Question 3

Class Hydrozoa Unique Characteristic

Answer 3

polyp stage is physically and temporally dominant

Question 4

Class Scyphozoa (true jellyfish)

Answer 4

medusa stage is physically and temporally dominant

Question 5

Class Anthozoa Unique Characteristic (sea anemone and coral)

Answer 5

No medusa stage, just planula and polyp

Question 6

Phylum Platyhelminthes Unique Characteristic (Class Turbellaria, Trematoda, Cestoda)

Answer 6

dorsoventrally flattened body shape

Question 7

Class Turbellaria Unique Characteristic (organism with two little eyes, symmetric body)

Answer 7

flatworms that don’t parasitize other animals

Question 8

Class Trematoda Unqiue Characteristic (flukes)

Answer 8

presence of sucker in oral and posterior part of body

Question 9

Class Cestoda Unique Characteristic (tapeworms)

Answer 9

lack digestive system, don’t have body cavity

scolex (oral sucker with rostellum and suckers) used for host attachment

Question 10

Phylum Rotifera Unique Characteristic (microscopic, near microscopic aquatic animals)

Answer 10

structure of foot, toe, and corona (look like lips)

Question 11

Phylum Mollusca Unique Characteristic (classes bivalvia, gastropoda, cephalopoda, polyplacophora)

Answer 11

a mantle with mantle cavity and a shell (if not lost)

Question 12

Class Bivalvia Unique Characteristic (mussels, clams, etc.)

Answer 12

Two shells that meet at a hinge

Question 13

Class Gastropoda Unique Characteristic (snails, slugs, whelks, conch)

Answer 13

2 eye stalks, large muscular foot

Question 14

Class Cephalopoda Unique Characteristic (squid, octopi, nautilus)

Answer 14

multiple tentacles

Question 15

Class Polyplacophora Unique Characteristic (chitons)

Answer 15

Plate-like shell that is segmented into 8 pieces

Question 16

Phylum Nematoda Unique Characteristic (round worms)

Answer 16

only longitudinal muscles

Question 17

Phylum Annelida Unique Characteristic (segmented worms- clades errantia and clitellata)

Answer 17

long, segmented body plan

Question 18

Clade Errantia Unique Characteristic (marine annelida)

Answer 18

setae bundled on parapodium

Question 19

Clade Clitellata Unqiue Characteristic (earthworms, leeches)

Answer 19

presence of clitellum (used for reproduction)

Question 20

Phylum Arthropoda Unique Characteristic (subphylum chelicerata, crustacea, hexapoda, and myriapoda)

Answer 20

hard exoskeleton made of chitin

Question 21

Subphylum Chelicerata Unique Characteristic (classes merostomata and arachnida)

Answer 21

lack of antennae

Question 22

Subphylum Crustacea Unique Characteristic (classes copepoda, branchiopoda, malacostraca)

Answer 22

two pairs of appendages in front of mouth

Question 23

Subphylum Hexapoda Unique Characteristic (class insecta)

Answer 23

consolidated thorax

Question 24

Subphylum Myriapoda Unique Characteristic (classes chilopoda and diplopoda)

Answer 24

segmented trunk with multiple legs running down body

Question 25

Class Merostamata Unique Characteristic (horseshoe crabs)

Answer 25

book gills for respiration

Question 26

Class Arachnida Unique Characteristic (spiders, mites, ticks)

Answer 26

book lungs for respiration

Question 27

Class Copepoda Unique Characteristic (small marine animal with oar feet and antennae)

Answer 27

biramous appendages

Question 28

Class Branchiopoda Unique Characteristic (water fleas, sea monkeys, fairy shrimp)

Answer 28

gill feet

Question 29

Class Malacostraca Unique Characteristic (lobsters, crabs, shrimps)

Answer 29

compound stalked or sessile eyes, three tagmata

Question 30

Class Insecta Unique Characteristic (ants, flies, butterflies, beetles)

Answer 30

3 pairs of legs, all projecting from thorax

Question 31

Class Chilopoda Unique Characteristic (centipedes)

Answer 31

1 pair of legs per body segment

Question 32

Class Diplopoda Unique Characteristic (millipedes)

Answer 32

2 pairs of legs on most body segments