Siphuncle - Wikipedia
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 …
Ammonoidea - Wikipedia
The siphuncle in most ammonoids is a narrow tubular structure that runs along the shell's outer rim, known as the venter, connecting the chambers of the phragmocone to the body or living …
Siphuncle Controls Buoyancy — Biological Strategy - AskNature
2016年10月14日 · Reaching through the interior of the shell is a tubular structure called the siphuncle. The nautilus uses this organ to control the volumes of water and gases within each …
The Cephalopoda - University of California Museum of Paleontology
The siphuncle is an internal tube that runs through and connects the chambers of the shell. In nautiloids, it runs through the center of the shell chambers, while in almost all planispiral …
Chambered Nautilus - The Australian Museum
This strongly coiled, pearly shell is divided into more than 30 chambers that are connected via a tube containing living tissue known as a siphuncle. The siphuncle is responsible for controlling …
What is a nautilus? - NOAA's National Ocean Service
2024年6月16日 · The tissue in a canal called the siphuncle [sigh-funk-el] connects all of the interior chambers. As seawater pumps through the living chamber, the nautilus expels water …
Siphuncle | invertebrate anatomy | Britannica
…a porous tube called the siphuncle. The chambers contain quantities of water and gas that are adjusted by the siphuncle to achieve neutral buoyancy. Many seashells are brightly coloured in …
Siphuncle - Encyclopedia.com
2018年5月8日 · siphuncle A long tube present in those cephalopods (Cephalopoda) that possess external shells. It runs internally, through all the chambers, and contains the siphuncular cord …
Cephalopods: Octopus, Squid, Cuttlefish, and Nautilus
Like the living nautilus, a fossil cephalopod shell has two distinguishing characteristics: a series of chambers divided by walls but connected by an internal tube. The barriers that separate the …
Cephalopod Mollusks: Squid and Octopus – WGNHS – UW–Madison
The siphuncle contains liquid that helps maintain the buoyancy of the animal in the water. Like their clam and snail relatives, cephalopods possess typical molluscan features: a shell, a …