Fossils

[danger will robinson]

You mean the published field guide, right? Yes, you can. You can do anything. Including setting it on fire. I wouldn't reccomend it though.

[Guy]

I'm sure these have already been mentioned, but just for clarification:
1. What is the difference between nautiloids and ammonoids?
2. What is the difference between brachiopods and bivalves?

[Deeisenberg]

I'm sure these have already been mentioned, but just for clarification:
1. What is the difference between nautiloids and ammonoids?
2. What is the difference between brachiopods and bivalves?

Nautoloid and ammonoid refer to suture patterns that are seen on the surface of the shells. You can look up the different between goniatite, ceratite, nautoloid, and ammonoid sutures.
Brachiopods are not closely related to bivalves. Bivalves are mollusks, and the internal anatomy of the two are VASTLY different. While both are mostly composed of filter feeders, the only thing they really have in common is the general two piece shell. Also many brachiopods cannot open or close the shell.

[Sheogorath]

I do believe brachiopods are generally symmetrical vertically (as in the left half of the shell is the same as the right)
and bivalves are symmetrical when cut in half (as in the top of the shell is symmetrical to the bottom)

[danger will robinson]

Also, the way they attach themselves to the bottom of the sea floor is different. Brachiopods have a pedicle, which extends down into a "burrow" in the ground. This means that they cannot move back and forth, but they can extend and retract their pedicle in times of danger. On the other hand, bivalves have a thin, hatchet-shaped foot with which they can move horizontally. Most are "creepers", which means that they can only pull themselves along very slowly, but some, such as Razor clams, can actually retract their muscles so fast that they can leap up to 25-30 cm.

[gneissisnice]

Brachiopods also feed by means of a lophophore, a collection of tentacles only used by them, bryozoans, and some other one that we dont have to know.

[binary010101]

Do ammonites have a radula?

[Guy]

Do ammonites have a radula?

Most cephalopods have radula, and ammonites I think do. Cephalopods are closely related to gastropods, which definitely have radula.

[gneissisnice]

As far as I know, the only molluscs without a radula are bivalves.

[gneissisnice]

Ugh, my regionals is in 2 days and im still working on my binder =/. If anyone could give me some information on Septastraea (coral genus), it would be greatly appreciated. I literally cannot find one useful thing on it.
And plant fossils are bad =/