Bio Lab Sponges And Cnidaria

Front 1

Trait

Back 1

genetically determined characteristic or condition

Front 2

Mutation

Back 2

change/departure from parent type in one or more hertable characteristics

Front 3

most recent common ancestor

Back 3

the most recent hereditary ancestor the species share

Front 4

Phylogeny tree

Back 4

shows the development of different speicies in relation to others, starts at ancestral protist w/ multicellularity

-first split is no true tissues vs. true tissues, and next radial vs. bilatteral symmetry

Front 5

Parazoa

Back 5

sponges ONLY - body form is so different from all other species

Front 6

Eumetazoa

Back 6

all other animals

Front 7

Phylum Porifera

Back 7

sponges, porifera meaning 'pore-bearing'

Front 8

3 classes of Phylum Porifera

Back 8

Demospongae (bath), Ccalcara (calcified), Hexactinella (glass)

Front 9

osculum

Back 9

sponge opening

Front 10

spicules

Back 10

needle-like objects, surrounding osculum.

-provide suppore and protection for body and prevent small animals from entering central cavity

Front 11

Central cavity

Back 11

serves as a channel for water which enters through the pores

Front 12

Spongin

Back 12

supportive material consisting of soft substance

Front 13

incurrent pores & canals

Back 13

allows for passage of water into spongocoel; canals open into choanocyte chambers

Front 14

choanocytes / collar cells

Back 14

line central cavity and channels leading into it, attached flagellas move water through the body.

Front 15

Cnidaria

Back 15

coral, jellies, sea anemones, porteguese man-of-wars

Front 16

Classes of Cnidaria

Back 16

Anthozoa (corals&anemones), Cubozoa (box jellies), Hydrozoa (P. m.o.w and hydra), Scyphozoa (true jellies)

Front 17

polyp

Back 17

sessile form - stuck on something using basal disc

Front 18

medusa

Back 18

motile form, floats around

Front 19

mouth

Back 19

the only opening to the digestive system and serves as both mouth and anus

Front 20

tentacles

Back 20

contain nematocysts and contract to provide slight movement through waters

Front 21

basal disc

Back 21

point of attachment to substrate

Front 22

mesoglea

Back 22

non-cellular gelatious material between inner and otter body walls (between epidermis and gastrodermis)

Front 23

cnidocytes

Back 23

stinging cells containt the nematocysts - used as defense mechanism or to secure prey

Front 24

nematocysts

Back 24

organelles inside cnidocytes holding capsules w/ coiled thread - whos barbs inject toxin into preys