Chapter 33: Invertebrates Flashcards
1
Q
Introduction
A
- Animals that lack backbone are called invertebrates
- account for 95% of animal species
![](https://s3.amazonaws.com/brainscape-prod/system/cm/201/166/258/a_image_thumb.png?1479347188)
2
Q
Sponges
A
- Belong to Phylum Porifera
- Lack true tissues, organs
- Suspension feeders
- Hermaphrodites – Male/Female
![](https://s3.amazonaws.com/brainscape-prod/system/cm/201/200/778/a_image_thumb.png?1479347285)
3
Q
Cnidarians
A
- Belong to Phylum Cnidaria
- Clade Eumetazoa - True tissue
- Diploblastic, radial symmetry
- Two body plan
- 1. Polyp
- 2. Medusa
![](https://s3.amazonaws.com/brainscape-prod/system/cm/201/200/912/a_image_thumb.png?1479347424)
4
Q
2 Major Clades of Cnidarians
A
-
1. Medusozoa
- members produce a medusa
-
2. Anthozoa
- members only occur in polyps
5
Q
Medusozoans
A
- Has 3 Groups:
- Scyphozoans - true jellyfish
- Cubazoans - box jellies
- Hydrozoans - Hydra, Obelia
![](https://s3.amazonaws.com/brainscape-prod/system/cm/201/201/136/a_image_thumb.png?1479347652)
6
Q
Anthozoans
A
- Include sea anemones, corals
- hard exoskeleton of calcium carbonate
![](https://s3.amazonaws.com/brainscape-prod/system/cm/201/201/230/a_image_thumb.png?1479347752)
7
Q
Lophotrochozoa
A
- Clade characterized by
- Lophophore
- Trochophore larva
- Has six major phyla *
![](https://s3.amazonaws.com/brainscape-prod/system/cm/201/201/365/a_image_thumb.png?1479347934)
8
Q
Flatworms
A
- Belong to Phylum Platyhelminthes
- Include:
- Planarians
- Trematodes - flukes
- Tapeworms
![](https://s3.amazonaws.com/brainscape-prod/system/cm/201/201/431/a_image_thumb.png?1479348078)
9
Q
Rotifers
A
- Belong to Phylum Rotifera
- Reproduce by parthenogenesis
- offspring from unfertilized eggs
- Some species lack males entirely
![](https://s3.amazonaws.com/brainscape-prod/system/cm/201/201/722/a_image_thumb.png?1479348209)
10
Q
Lophophorates
A
- Have crown of ciliated tentacles around mouth
- Used in suspension feeding
- Include phyla:
- Ectoprocta - “moss animals”
- Brachiopoda - “lamp shells”
![](https://s3.amazonaws.com/brainscape-prod/system/cm/201/201/788/a_image_thumb.png?1479348318)
11
Q
Molluscs
A
- Belong to Phylum Mollusca
- 2nd largest animal phlya
- Most have shell
- Body w/ 3 main parts
- Foot
- Visceral mass
- Mantle
12
Q
Molluscs cont…
A
- Include clades
- Polyplacophora - chitons
- Gastropoda
- Bivalvia
- Cephalopoda
13
Q
Chitons
A
- shell of eight dorsal plates
![](https://s3.amazonaws.com/brainscape-prod/system/cm/201/202/012/a_image_thumb.png?1479348526)
14
Q
Gastropods
A
- Most have singled, spiral shell
![](https://s3.amazonaws.com/brainscape-prod/system/cm/201/202/034/a_image_thumb.png?1479348585)
15
Q
Bivalves
A
- Shells in two halves, hinged
![](https://s3.amazonaws.com/brainscape-prod/system/cm/201/202/063/a_image_thumb.png?1479348651)