Brachial Valve
The small circles could represent predatory or
parasitic borings.
Pedicle Valve
General abundance: Common
Orbiculoidea missouriensis (Shumard)
is a phosphatic-shelled,
inarticulate brachiopod. Inarticulate brachiopods open their valves
with muscular and ligamentous connections.
Viewer Comments:
Nice Orbiculoidea. I have collected a bunch of O. keokuk
from my crinoid locality. Complete / completely exposed
specimens are rare. My smallest is 1 cm, the largest is
about 6 cm in diameter. Most fall somewhere in between.
Alan Goldstein
references:
Dunbar, C.O. and Condra, G.E., 1932, Brachiopoda of the Pennsylvanian
System in Nebraska; Nebraska Geological Survey, Bulletin 5, p.42,
pl.1, figs.12-17.
Hoare, R. D., 1961, Desmoinesian Brachiopoda and Mollusca
from
Southwest Missouri; University of Missouri Press, p.22, pl. 1,
figs.3-5
Hoare, R.D., 1968, Pennsylvanian brachiopods of Ohio;
Ohio Geological
Survey Bulletin 63, p.22, pl.1, figs.7-11
Brachiopods
Fossil Menu
Parasitic Menu
Pennsylvanian Fossils of
Missouri