Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

AP Biology > Chapter 33: Invertebrates > Flashcards

Chapter 33: Invertebrates Flashcards

1
Q

Invertebrates

A

Animals that lack a backbone. Includes 95% of animal species.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Placozoa

A

(1 species), An animal phylum with one species, Trichoplax adhaerens, which is a double layered blob 2mm across.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Kinorhyncha

A

(150 species), An animal phylum whose members live in sand and mud in oceans up to great depth. The organisms are tiny (<1mm in length) and segmented.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Porifera

A

(5500 species)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Cnidaria

A

(10 000 species)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Platyhelminthes

A

(20 000 species) Triploblastic, acoelomates. One opening in gastrovascular cavity.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Rotifera

A

(1800 species) alimentary canal instead of gastrovascular cavity. pseudocoelom. reproduce by parthenogenesis.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Ectoprocta

A

(4500 species) Phylum of Lophophorates. Colonial animals with hard exoskeleton, resemble plants, build reefs.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Phoronida

A

(20 species) Phylum of Lophophorates. tube-dwelling marine worms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Acanthocephala

A

(1100 species) Worms with curved hooks at the anterior end of their body.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Ctenophora

A

(100 species) Diploblastic, propel through the water using combs of cilia and catch prey with sticky threads.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Loricifera

A

(10 species) Strange microorganisms that live at the deep sea bottom with a head neck and thorax that can come in and out of a protective lorica.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Priapula

A

(16 species) Worms with a large proboscis at the anterior end. They live in sediments.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Cycliophora

A

(1 species) A very unusual micro organism that lives on lobsters and fertilizes before birth.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Tardigrada

A

(800 species) Microscopic “Water bears” that move slowly and can survive very harsh conditions.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Onychophora

A

(110 species) Velvet worms that live only in humid forests. Fleshy antennae and several dozen saclike legs.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Hemichordata

A

(85 species) Deuterostomes, gill slits, dorsal nerve chord. Marine acorn worms.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Brachiopoda

A

(335 species) Phylum of Lophophorates. Lamp shells, look like clams, but dorsal and ventral shells rather than lateral.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Nemertea

A

(900 species) Proboscis worms or ribbon worms. acoelomate but residual structure, hydraulic proboscis for prey. alimentary canal and closed circulatory system.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Mollusca

A

(93 000 species) Foot. Visceral mass. mantle. Mantle cavity. Radula.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Annelida

A

(16 500 species) Oligochaetes. Polychaetes. Leeches. Coelum.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Nematoda

A

(25 000 species) Non segmented. Longitudinal muscles. Parasitic. Ubiquitous. Pseudocoelom.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Arthropoda

A

(1 000 000+ species) Exoskeleton. Molting. Open Circulatory System.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Echinodermata

A

(7000 species) Deuterostome. Sea Star. Sea Urchin. Water Vascular System.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Chordata
(52 000 species) Deuterostomes. Notochord. Dorsal Nerve Chord. Pharyngeal Slits ("gills" on the throat)
26
Suspension Feeders
Organisms that capture food particles suspended in the water that pass through their body.
27
Spongecoel
Central cavity of a sponge.
28
Osculum
Opening out of the spongecoel.
29
Choanocytes
(collar cells) Cells which line the inside of the spongecoel and generate a water current. They phagocytose particles which get trapped in their collars.
30
Mesohyl
The gelatinous layer between the inner and outer layers of sponge cells.
31
Amoebocytes
Cell which wander around the mesohyl of sponges. They transport nutrients and build skeletal fibers.
32
Hermaphrodites
Animals which are both male and female.
33
Gastrovascular Cavity
The central digestive compartment inside the sac of a cnidarian.
34
Polyps
Cylindrical forms that adhere to the substrate by the aboral end of the body (the end opposite the mouth). Cnidarians
35
Medusa
Flattened, mouth-down version of the polyp. Moves freely in the water. Cnidarians.
36
Cnidocytes
Unique cells that function in defense and capture of prey. Capsule organelles that can evert.
37
Nematocysts
Stinging capsules. Cnidarians
38
Hydrozoans
Cnidarian. Both polyp and medusa stages. Colonial polyp stage.
39
Scyphozoa
Cnidarians. Polyp stage reduced. Jellies.
40
Cubozoa
Cnidarians. Box-shaped medusae, complex eyes
41
Anthozoa
Cnidarians. Medusa stage absent. most sessile.
42
Turbellarians
Best known are planarians. predators and scavengers. ciliated
43
Monogeneans and Trematodes
parasites. simple and complex life cycles. vertebrate hosts.
44
Cestoda
Parasites of vertebrates. Scolex attaches to host. Life cycle with intermediate hosts. no digestive system
45
Planarians
Members of the Platyhelminthes phylum and Turbellarian Class.
46
Alimentary Canal
A digestive tube with a separate mouth and anus.
47
Closed Circulatory System
Blood contained in vessels, but no heart.
48
Parthenogenesis
Reproduction where females produce females without fertilization.
49
Foot
Muscular for movement
50
Visceral mass
Contains internal organs
51
Mantle
Fold of tissue that covers visceral mass and secretes a shell.
52
Mantle Cavity
Contains gills, anus, and excretory pores.
53
Radula
Used to scrape of food
54
Trochophore
Ciliated larval stage
55
Chitons
Oval-shaped with eight dorsal plates. Class of Molluscs
56
Gastropods
slugs. snails. torsion. spiralled shell for retreat. slow movement. Class of Molluscs
57
Torsion
Visceral mass rotates up to 180˚ causing anus and mantle cavity to wind up above its head.
58
Bivalves
Class of Molluscs. Clams. Mussels. Scallops. Suspension feeders. Some can move.
59
Cephalopods
Octupi, squids, chambered nautiluses. Most have lost shell. Closed circulatory system. Siphon powered jet propulsion.
60
Oligochaetes
Annelida. reduced head. no parapodia, but chaetae present.
61
Chaetae
bristles for traction for burrowing
62
Polychaete
Annelida. Parapodia, almost feet.
63
Leeches
Annelida. Parasitic. Feast on blood. Anesthetic and anti-blood clotting secretions
64
Cheliceriforms
spiders, horseshoe crabs, ticks. chelicerae. earliest were eurypterids. book lungs
65
Chelicerae
clawlike feeding appendages which serve as pincers or fangs
66
eurypterids
water scorpions.
67
Book Lungs
Respiration in Spiders
68
Myriapods
Centipedes, Millipedes. Jaw-like mandibles
69
Incomplete Metamorphosis
Young resemble adults, but are smaller, have different body proportions, and lack wings
70
Complete Metamorphosis
Specialized stages that look nothing like the adult
71
Crustaceans
Lobsters. Krill. Barnacles.
72
Isopods
Pill bugs
73
Decapods
Lobsters. crayfish, crabs, shrimp
74
Copepods
Krill
75
Asteroidea
Sea Stars.
76
Ophiuroidea
Distinct central disk; long, flexible arms; tube feet lack suckers
77
Echinoidea
sea urchins, sand dollars
78
Holothuroidea
Sea Cucumber, five rows of tube feet
79
Concentricycloidea
Disk-shaped body ringed with small spines; incomplete digestive system
80
Tube Feet
Adaptation found in echinoderms that functions in locomotion, feeding, and gas exchange.

AP Biology (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions