lecture 4 invertebrates (non-arthropods): molluscs & annelids

Question 1

what does the phylum mollusca mean in latin

Answer 1

soft

Question 2

examples of species in the mollusca

Answer 2

snails clams octopussies

Question 3

mollusca symmetry type

Answer 3

bilateral

Question 4

mollusca (a)coelomates?

Answer 4

coelomates

Question 5

four types of mollusc body plans

Answer 5

gastropods, cephalopods, bivalves chitons

Question 6

what does the class bivalvia mean in latin

Answer 6

bi = 2
valvia = valve

Question 7

what are bivalves

Answer 7

Aquatic animals with two shell valves (bi-lateral symmetry)

Mostly sedentary or burrowing

Question 8

bivalve adaptations

Answer 8

greatly expanded gills for filter feeding and respiration

Question 9

bivalve sex

Answer 9

Separate sexes, fertilisation is external & free-swimming larva

Question 10

what does the class gastropoda mean in latin

Answer 10

gastro = stomach
poda = feet

Question 11

where do gastropods live

Answer 11

terrestrial and aquatic

Question 12

gastropod adaptations

Answer 12

Head well developed for finding food; eyes, tentacles etc.
Asymmetrical body due to shell coiling & torsion
some have lost or reduced shell

Question 13

what is torsion

Answer 13

twisting of the body in relation to head & foot brings the anus above the head

Question 14

what type of eaters are gastropods

Answer 14

Herbivorous, carnivorous or scavengers

Question 15

what are gastropods, sexually?

Answer 15

seperate sexes OR hermaphrodites

Question 16

how do snails mate

Answer 16

Elaborate and slow mating ritual
exchange sperm and a ‘love dart’ – mucus covered calcareous dart
they have their genitals near their heads

Question 17

what does the class cephalopoda mean in latin

Answer 17

cephalo head

poda feet

Question 18

what type of animal are cephalopods

Answer 18

Marine predators

Integral head & foot; tentacles, usually with suckers

Question 19

whats special about the shell of cephalopods

Answer 19

Shell usually internal; “cuttlebone” of Sepia provides support & bouyancy

Question 20

how are squids(cephalopods) adapted for fast swimming

Answer 20

Squids have elongated body, fins & ”jet propulsion” for fast swimming

Question 21

cephalopods wheres the brain and whats special about it

Answer 21

in the braincase

highly developed and sophisticated behavior

Question 22

cephalopods sex

Answer 22

seperate sexes with courtship displays

Question 23

what does sthe phylum annelida mean in latin

Answer 23

annel = ringed

Question 24

what kinda species are annelids

Answer 24

Fan worms, bristle worms, earthworms & leeches

Question 25

annelids, what are they like?

Answer 25

Bilateral symmetry and segmented body Body covered with chaetae (bristles used for movement)

Question 26

annelids (a)coelomates?

Answer 26

coelomates

Question 27

coelomate advantages

Answer 27

hydrostatic skeleton | transport of excretory and sexual products

Question 28

annelids have metameric segmentation, what is this

Answer 28

allow independent movement of different portions of muscles.

Question 29

where do annelids live

Answer 29

Marine, fresh water and terrestrial species.

Question 30

how do annelids reproduce

Answer 30

sexual and asexual reproduction

Question 31

what are the three classes of annelids

Answer 31

polychaeta oligochaeta hirudinea

Question 32

what does the class polychaeta mean in latin

Answer 32

many bristles

Question 33

what are polychaetes and examples

Answer 33

Marine annelids Mobile and sedentary species fan worm bristleworm lugworm

Question 34

what are the oligochaetes and examples

Answer 34

terrestrial and aquatic annelids Few bristles earthworms sludgeworms

Question 35

what is a hirudineate

Answer 35

Ectoparasites or predators Few bristles Some blood suckers eg leeches

Question 36

what clades has new genetic evidence brought

Answer 36

errantia | sedentaria

Question 37

what are the errantia

Answer 37

mobile marine predators | that craw or burrow on the seafloor

Question 38

what are the sedentaria

Answer 38

marine sedentary worms | earthworms leeches

Question 39

what does errantia mean in latin

Answer 39

errant = travelling

Question 40

what are some morphological features of errants

Answer 40

Well defined head with eyes and jaws | Each body segment with prominent parapodia

Question 41

how do errants reproduce

Answer 41

Sexual reproduction with separate sexes

Question 42

sexes in sedents

Answer 42

hermaphrodites

Question 43

what is metameric segmentation

Answer 43

The repetition of organs and tissues at intervals along the body of an animal, thus dividing the body into a linear series of similar parts or segments