Phylum Porifera

Question 1

Characteristics of Phylum Porifera

Answer 1

Have no neurons, no true organs, have Choanocytes. can use CaCO3, or Si)2 and collagen as structural elements. They are suspension feeders, that are sessile as adults, the larvae are mobile tho.

Question 2

Poiferan Body plan

Answer 2

Consist of the cel layers Pinacoderm, mesohyl, the choanoderm. then the atrium (space in center), the Osculum the opening at top. Then the Ostium, opening on side where water and food enter through.

Question 3

Cell types of the Pinacoderm

Answer 3

Pinacytes, Basopinacytes, endo nd exopinacocytes, and porocytes

Question 4

Cell types of the mesohyl

Answer 4

Archaeocytes(amoebocytes), Sclerocytes, spongocytes and collencytes

Question 5

Cell types of the Choanoderm

Answer 5

Choanocytes

Question 6

Asconoid Condition

Answer 6

Simplest, less than 10 cm in height. Has porocytes, atrium and a single Osculum.

Question 7

Synconoid

Answer 7

Has Dermal Pores, Incurrent canal( where watrer enters the chambers), and Prosopyle(how water moves from chamber to chamber). Has Choanocyte chambers. Apopyle (allows water to enter the atrium) and Osculum

Question 8

Leuconoid

Answer 8

Most advanced condition, with dermal pores , incurrent canals, prosopyle, has discrete chambers, apopyle , and excurrent canals

Question 9

Class Calcarea

Answer 9

Have Calareous spicules, that are 1,3, or 4 rayed.Asconoid, synconoid, or Leuconoid, all are marine,

Question 10

Class Hexactinnellida

Answer 10

Siliceous Spicules that are 6- rayed, are Leuconoid, most are deep dea.

Question 11

Class Demospongiae

Answer 11

Siliceous spicules, not 6-rayed. Have Spongin fibers, the most diverse group of sponges, both fresh and marine species

Question 12

Carnivorous Sponge

Answer 12

Cladorhizidae from class demospongiae.