An aptychus is either a two-valved closing hatch on the shells of extinct ammonites or a jaw-piece of some modern cephalopods. When only a single plate is present, the term anaptycus is used. ...more on Wikipedia about "Aptychus"
The body chamber, also called the living chamber, is the outermost or last chamber in the shell of a nautiloid or ammonoid cephalopod. The body of the animal occupies the living chamber, apart from the siphuncle which extends through the rest of septa (the phragmocone) to provide buoyancy. ...more on Wikipedia about "Body chamber"
Camerae (sing. Camera) are the spaces or chambers enclosed between two adjacent septa in the phragmocone of a nautiloid or ammonoid cephalopod. These can be seen in cross-sections of a nautilus shell and in the polished cross-sections of ammonites. In life these chambers are filled with gas, mediated by the siphuncle, and used to control buoyancy. ...more on Wikipedia about "Camerae"
Chromatophores are pigment cells found in amphibians, fish, reptiles and cephalopods. ...more on Wikipedia about "Chromatophore"
A hectocotylus is one of the arms of the male of most kinds of cephalopods that is modified in various ways to effect the fertilization of the female's eggs. It is a specialized, extended tentacle used to store spermatophores, the male gamete. Males generally form a new hectocotylus in each new season. ...more on Wikipedia about "Hectocotylus"
The hyponome is the organ used by cephalopods for locomotion. It is a muscular funnel or siphon into which water is drawn. The hyponome expands and then contracts, sending a jet of water rushing out. This jet propels the cephalopod backward, but it can control its direction of movement by pointing the hyponome in different directions. ...more on Wikipedia about "Hyponome"
Orthocone is a usually long straight shell of a nautiloid cephalopods. During the 18th and 19th centuries, all shells of this type were named Orthoceras, but it is now known that many groups of nautiloids dffeveloped or retained this type of shell. ...more on Wikipedia about "Orthocone"
Phragmocones are the chambered portions of the shell of a cephalopod. They are divided by septa into camerae. ...more on Wikipedia about "Phragmocone"
Septa (sing. septum) are thin walls or partitions between the internal chambers ( camerae) of the shell of a cephalopod, namely nautiloids or ammonoids. ...more on Wikipedia about "Septa (biology)"
The siphuncle is a strand of tissue passing longitudinally through the shell of a cephalopod mollusk. Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the living nautiluses, cuttlefish, and Spirula. In the case of the cuttlefish, the siphuncle is indistinct and connects all the small chambers of that animals highly modified shell; in the other cephalopods it is thread-like and passes through small openings in the walls dividing the chambers of the shell. ...more on Wikipedia about "Siphuncle"
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