University of Iowa
Evolution & the History of Life
Part I. Phylum Porifera (Sponges)
B. Look at the following link: Diagram
of sponge with labelled parts
C. Optional-if you are interested, look at other
D. Read about stromatoporoids.
E. Know the common features of Stromatoporoids:
Branching or encrusting or bulbous masses, with thin
concentric laminae parallel to the surface.
Presence of pillars and astrorhizae.
These specimens are from the Subphylum Stromatoporoidea
("reticulum of vertical and horizontal rods"), Family Idiostromatidae.
F. Look at the specimens
from boxes 1 and 2:
G. Look at the specimens
from box 3:
|Question 1: What differences
(size, internal features) can you see between the stromatoporoids, Amphipora
1) and Idiostroma (box 2)?
These specimens are also from the Subphylum Stromatoporoidea. However,
the Family is Stromatoporoidae.
|Question 2: Draw Stromatopora and label
the vertical pillars, horizontal laminae, latilamellae/latilamina (growth
bands), and astrorhizae. What overall shape (encrusting, massive, or branched)
does this stromatoporoid have?
You are finished with Part I
of the lab. Choose Part II, Part III, or Part IV from the choices below,
if you have not yet completed these sections.
Last updated on February 24, 1997-jlc.