17 Porifera: sponges
Porifera have what type of symmetry.
Asymmetrical
Are Porifera marine or freshwater?
Both; marine songes are larger, more coloful and 2-3cm
(T/F) Fertilization occurs between egg and sperm of the same sponge.
False. Sponges only do cross-fertilization.
Does Porifera have direct or indirect development?
Indirect; free-swimming larval stages and sessile adults
osculum/ oscula
LARGE opening at the top for water and waste to LEAVE
oldest animal phylum
Phylum Porifera (sponges)
The free-swimming larval stage of porifera moves very slowly. What is another name for this?
Sendentary
Porifera have what type of body and backbone?
acoelomate; invertebrate
Phylum Porifera What structures does the middle mesohyl have?
amoebocytes spicules spongin
list the 3 types of porifera body structure
asconoid, syconoid, leuconoid
leuconoid
bath sponge thickest body wall many connected choanocytes
a hermaphroditic anime produces
both eggs and sperm
fragmentation
breaking into fragments
spongocoel
central cavity of a sponge
calcarea
chalky sponges with CaCO3 spicules
What structure is unique to Porifera?
choanocytes
What parts of the sponge transform to perform sexual reproduction?
choanocytes transform into sperm; amoebocytes transform into egg cells
Phylum Porifera What does the inner layer include?
choanocytes/ collar cells
What does the larval stage of porifera use to move?
cilia
choanocyte function
engulf and digest food transform into sperm for sexual reproduction
Phylum Porifera What structures are in the outer epithelium?
epithelial wall cells and ostia spongocoel osculum
Categorize Porifera digestion (2 terms)
filter feeders; intracellular digestion
choanocytes
flagellated cells that engulf and digest food from passing water
How do sponges reproduce asexually
fragmentation
how do sponges reproduce sexually
gametes
Hexactinellida
glass sponges and the Venus Flower Basket with silica spicules
list the 3 classes of sponges
hexactinellida, demospongiae, calcarea
demospongiae
horny and bath sponges ONLY spongin/ songin and silica spicules soft
invertebrate
lack a backbone
acoelomate
lack a body cavity
what gender are sponges
most are hermaphroditic
spicules
needles of CaCO3 or silica
Porifera have what type of organs?
none
Porifera have what type of tissue?
none
what type of animal is the Venus flower basket?
porifera: sponge
Functions of amoebocytes
secret stuff to make spicules and spongin transform into egg cells during reproductive season
cross-fertilization
sexual reproduction between different sponges
ostia
small pores in epithelial wall allow O2 and food enter sponge body
How does development of the larva occur?
sperm+egg=zygote/ larva
"skeleton" of sponge includes and their function
spicules and spongin provides support
parazoan
subphyla of porifera lack true tissue
syconoid
thick, pleated body wall
asconoid
thin body wall single layer of choanocytes
spongin
tough protein fibers
eumetazoan
true tissue
Where can larva development occur?
within mother or in open water
