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BI488- Invertebrate Conservation > Week 2 > Flashcards

Flashcards in Week 2 Deck (65)
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1

What does benthic mean?

"on the bottom"

2

what are benthic macroinvertebrates

wide variety of organisms that live on the bottom of lakes, ponds and rivers

3

what are some characteristics of class gastropoda

snails and limpets, highly mobile, contain radula

4

what are some characteristics of class bivalva

clams and mussels, no radula, filter feeders

5

T or F: gastropods and bivalves live in saltwater

F; freshwater

6

what distinguishes the chonchifera clade

posess a shell

7

one of the earliest animals to invade the land are predicted to be _____

snails

8

what indicates mollluscs originated in the sea?

fossil evidence

9

what is contained in the head-foot region of mollusc

feeding and locomotor organs

10

what is contained in the visceral mass of the mollusc

digestive, circulatory, respiratory and reproductive organs

11

the mantle cavity in the mollusc usually houses the ____

gills/lung

12

in most molluscs, the mantle secretes a _____ over the visceral mass

shell

13

what is an odontophore

supporting cartilage that the radula sits on top of

14

what is the periostracum

outer organic layer of the shell, composed of conchiolin

15

what is the inner narceous layer

next to the mantle in molluscs, laid down in thin layers and becomes thicker with age

16

how are pearls formed in molluscs

when small objects get caught within the mantle, the nacre secretes mucous in and secretes a peal to reduce irritation

17

what is torsion

twisting of the viscera

18

when does torsion occur in moluscs

in the embryonic stage, anus gets twisted towards the anterior side

19

what is a disavantage of torsion in molluscs

anus comes out the mantle cavity where the lungs are, this can have complications

20

What is the difference between Oligochaeta and Hirudinea

Oiligochaetes have setae, leeches have suckers

21

what is a characteristic that all annelids share (ancestral state)

parapodia: small paddle like assemblages

22

what is a chractersitic that all Oligochaeta and Hirunida share

Clitellum: larger part of the body that contains the organs

23

what are setae?

small hairs, anchors that help push them through the soil in order to prevent backwards movement

24

what are some characteristics of class Hirudinea

dorso-ventrally flattened, posterior sucker, parasitic and predatory forms, not all are parasites nor do all drink fluids

25

all Hirudinea have exactly ___ segments

34

26

T or F: most leeches are freshwater

T

27

class hirudinea lack distinct ______ departments

coelomic

28

what is the suphylum hexapoda

class insecta

29

what is the class malacostracta

crayfish and shrimps

30

what is the class ostracoda

seed shrimps