Tabulata (tabulate corals)
Tabulate corals have well-developed tabulae, but
no septa or dissepiments. All are colonial. Tabulate corals range
from the Ordovician to the Permian; and were especially abundant in Silurian
and Devonian reef environments. They were restricted to warm, clear water.
Four distinct growth forms are represented by the following genera:
Favosites has a ceroid
growth form and is shaped like a compact honeycomb.
In cross section, numerous well-developed horizontal
tabulae are readily seen.
Halysites consists of small
chains. The "chains" join and diverge in various ways, but the areas
between the chains are open. Well-developed horizontal
tabulae are present, but not often seen in fossils.
Syringopora (organ pipe coral) has a phaceloid
growth form. It has erect, irregular corallites with funnel-shaped tabulae
(rarely seen); the individual
corallites are connected only by horizontal tubes.
Aulopora has a dendroid growth form, in which
small (< 1cm) trumpet-shaped corallites grow outward from the side of
one another. Curved tabulae are present, but ususally not seen. This coral
encrusts shells and other foreign surfaces.
Be sure to open the links and
look at each type of tabulate coral. This will help you answer the questions.
Evolution & the History of Life course home page
Lab 5: Colonial Invertebrates, part II
Last updated on February 24, 1997-jlc.