Lecture 31 - Invertebrates II Flashcards Preview

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Flashcards in Lecture 31 - Invertebrates II Deck (35):
1

What are 4 characteristics of Phylum Platyhelminthes (flatworms)?

1. No organs for specialized gas exchange
2. Flat shape for diffusion of materials
3. Fine branches for food distribution
4. Flame cells help maintain osmotic balance

2

What are 4 classes of Phylum Platyhelminthes (flatworms)?

1. Turbellaria
2. Monogenea
3. Trematoda
4. Crestoda

3

2 characteristics of Turbellaria

1. Mostly free-living flatworms
2. Ciliated body surface (i.e. planaria)

4

2 characteristics of Monogenea

1. Marine and freshwater parasites
2. Parastize fish

5

3 characteristics of Trematoda

1. Parasites
2. Almost always lack vertebrates
3. Most life cycles include intermediate hosts

6

What are the biggest parasites of humans?

tapeworms

7

Where do Phylum Rotifera inhabit?

-freshwater, ocean, damp soil

8

3 characteristics of Phylum Rotifera

1. Smaller than most protists
2. Truly multicellular
3. Specialized organ systems

9

2 characteristics of Phylum Brachiopoda

1. Lamp shells with dorsal valves
2. Brachiopods attach to substrate by stalks

10

Phylum Mollusca are notable for the increased complexity in _________

their body plan

11

What are 4 classes of molluscs?

1. Polyplacophora (chitins)
2. Gastropoda (snails, slugs)
3. Bivalvia (clams, mussels, scallops, oysters)
4. Cephalopoda (squids, octopuses, etc.)

12

2 characteristics of Polyplacophora (chitons)

1. 8 dorsal plates
2. grazers (use radula to scrape algae)

13

What is a defining characteristic of Gastropoda?

-undergo torsion during development

14

2 characteristics of Bivalvia (clams, mussels etc.)

1. Flattened shell closes R/L valves with adductor muscles
2. Filter feeders (eg clams, oysters, muscles etc.)

15

2 characteristics of Cephalopoda (squids, octopuses etc.)

1. Reduced/absent internal shell
2. Use siphon to dart towards prey

16

What is the biggest invertebrate of them all?

architeuthis (giant squid)

17

What are 3 classes of Phylum Annelida?

1. Oligochaeta
2. Polychaeta
3. Hirudinea

18

What are 4 characteristics of oligochaeta?

1. Reduced head
2. No parapodia
3. Sparse chaetae (e.g. earthworm)
4. Hermaphrodites, cross-fertilize

19

2 characteristics of Polychaeta?

1. Well-developed head
2. Parapodia with chaetae that work as gills, aid in locomotion

20

4 characteristics of Hirudinea?

1. Reduced coelom
2. Absent chaetae
3. Bloodsucking parasites
4. Anterior/posterior suckers (e.g. leeches)

21

What are Phylum Nematoda?

-Roundworms in most aquatic habitats, wet soil, most tissues of plants, body fluids/tissues of animals

22

What are 3 characteristics of Phylum Nematoda?

1. sexual reproducers
2. complete digestive tract
3. no circulatory system

23

How do Phylum Nematoda move?

-longitudinal muscle contraction

24

Phylum Nematoda are covered in _______

exoskeleton (the cuticle)

25

What do Phylum Nematoda have a major role in?

decomposition

26

3 major Arthropod features

1. Exoskeleton made of layers of protein + chitin
2. Open circulatory system
-(Hemolymph circulated into spaces surrounding tissues and organs)
3. Variety of organs specialized for gas exchange

27

What are the 4 subphyla of Phylum Arthropod?

1. Cheliceriformes
2. Myriapoda
3. Hexapoda
4. Crustacea

28

2 qualities of Subphylum Cheliceriformes

1. Body has 1-2 main parts with 6 appendages (horseshoe crabs)
2. Mostly terrestrial or marine

29

2 qualities of Subphylum Myriapoda

1. Head with antennae + chewing mouth parts (millipedes + centipedes)
2. terrestrial

30

3 qualities of Subphylum Hexapoda

1. Body divided in head/thorax/abdomen present
2. 3 pairs of legs + 2 pairs of wings (includes class insecta)
3. mostly terrestrial

31

3 qualities of Subphylum Crustacea

1 . Body with 2-3 parts + antennae + chewing mouthparts + 2-3 pairs of legs
2. Mostly marine + freshwater
3. (decapoda EX: crabs, lobsters, shrimps)

32

What are 3 major effects of insects on the environment/other organisms?

1. important natural + agricultural pollinators
2. carriers for many diseases (EX: West Nile, malaria, African Sleeping Sickness)
3. Competitors with humans for food + fiber

33

Insects affect all other ________

terrestrial organisms

34

_______ are the most diverse order of animals

beetles

35

2 qualities of Phylum Echinodermata

-invertebrate deuterstomes with bilateral larva + radial adults
-sea stars, brittle stars, sea urchins etc.