17 Porifera: sponges

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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


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