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BI488- Invertebrate Conservation > Week 8 > Flashcards

Flashcards in Week 8 Deck (42)
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1

what are the four levels of organismal complexity?

protoplasmic, cellular, tissue and organ system

2

what is the phylum porifera

sponges!

3

The porifera skeleton is made up of _______-

spicules

4

what are asconoids

flagellated spongocoels

5

what are choanocytes

in all sponges, cells with flagella that help make a water current to pull water in

6

what are syconoids

wall contains folded back choanocyte lined canals, spongocoel lined with epithelial cells

7

what are leuconoids

clusters of flagellated chambers, no spongocoels, have many exits

8

what are the support cells in sponges

choanocytes, pinacocytes and archaeocytes

9

what are pinacocytes

can open or close of the surface and can control gas exchange, flow of water, etc

10

what are archaeocytes

can transport particles around the sponge, food to other cells, help make up the skeleton

11

what are collencytes

secrete collagen, make web like structure within cytoplasm, create skeletal sort of structure

12

how do sponges reproduce asexually

by fragmentation or budding

13

how do sponges reproduce sexually

internal and external fertilization, produces free swimming larva

14

T or F: most sponges monoecious

T

15

what are the three classes of sponges

calcarea, hexactinellida and demospongiae

16

what is the class homocleromorpha

originally thought to be part of demospongiae, grows on rocks

17

what is class calcarea

have straight spicules, tend to be small

18

what is class hexactinellida

usually six rayed, deep sea forms

19

what is class demospongiae

80 percent of all spongiae, wide variety of types

20

what are the four characteristics echnioderms have that no other phylum does

1-endoskeleton of ossicles
2-water vascular system
3-pedicelariae
4-pentaradial symmetry

21

ossicles are plates made out of _____

calcium

22

how does the water vascular system work

water comes in through pore, flows through radial canal an through tube feet in order to cause movement

23

what are pedicellaria

jaw-like pincers on the surface, like forceps, some capture food particles, others for protection, keep animal clean

24

pentaradial symmetry has __ lines of symmetry

5

25

what is class asteroidea

sea stars

26

T or F: class asteroidea is capable of regenerating

T

27

what is class ophiruoidea

brittle stars

28

T or F: brittle stars' tube feet lack suckers

T

29

what is class echinoidea

sea urchins and sand dollars

30

sea urchins have ___ symmetry

radial