Oh man, all those Nautilus questions that have never been answered... hmmm... So, the siphuncle placement of Ammonites and Nautilus are different, how do you think this might affect septal shape and buoyancy regulation?
Soft‐tissue imprints in fossil and Recent cephalopod septa and septum formation Just found this article, I always wondered how both Nautilus and Ammonite formed the new septum and held on to their shell while moving forward into the new space. Must be a point where the connection to the shell is somewhat tenuous.
Great idea! I have a few questions and would love to hear what you think. 1) How many scientists are actively working on nautiluses? My impression is that there's little room for cephalopodologists in modern biology (for a number of reasons), let alone specialists in smaller groups. 2) How well do we know the anatomy of nautiluses? From what I remember about nautilus taxonomy a lot of the diagnostic features are vague and based on gross morphology. 3) Nautilus shells have been popular since the early modern period in cabinets or curiosities and Wunderkammers. Is there anything we could learn from historic populations by sampling all those 17thC bling bling shells (some e.g.s here) in art museums?
Greg, do you remember how long the nautiluses stayed partially out of their shells (hours, days?)@cuttlegirl , This is only anecdotal, but I've observed two nautiluses that have come almost entirely out of their shell on different occasions and were found on the bottom of the tank with tentacles attached to the bottom. At first, I figured this meant we'd find a dead nautilus soon, but they went back into their shell and survived with no apparent problems. I've asked a few folks and have heard of a few similar instances. Could this be part of the "moving forward" of nautiluses when making new septal walls?