Nautilus pompilius’s rhinophores and lateral digital tentacles are thought to have a chemosensory function, and be crucial for locating prey

(Post by Kathryn McRae)

Nautilus pompilius is a shelled cephalopod (Picture 1) found in the Indo-Pacific at a depth of 300m. (Soucier and Basil, 2008) At night Nautilus pompilius rises to a depth of 75m and hunts for crustaceans, nematodes, and echinoids along coral reef slopes. (Basil et al, 2000) (Ruth et al, 2002)Though Nautilus pompilius has primitive image forming eyes, Nautilus pompilius is believed to rely on chemoreception when hunting. (Basil et al, 2000) The parts of Nautilus pompilius thought to have cartier replica a specialized chemosensory function cartier jewelry replica are the rhinophores fake cartier bracelet replica
and lateral how much cartier love bracelet does a cartier bracelet cost
digital tentacles. (Ruth et al, 2002)

(Picture 1:  A Nautilus pompilius. Photo taken by Josh More on Flickr, and published under the creative commons license.)

The rhinophores are located cartier love replica cartier ring bracelet
below the eyes, (Picture 2) and the lateral digital tentacles are normally retracted into the shell. (Ruth et al, 2002) Basil et al, (2005) observed that when fish scented water was pipetted onto the rhinophores that Nautilus pompilius exhibited cone of search behavior by extending and spreading its lateral digital tentacles, suggesting cartier love bracelet that the rhinophores have a chemosensory function. (Basil et al, 2005)  Once cone of search was triggered Nautilus pompilius began to swim towards the odor cartier love bracelet
source. (Basil et al, 2005)  When Basil et al, (2000) used a dyed odor to examine Nautilus pompilius’s tracking behavior, Nautilius pompilius was observed to mostly swim in the odor plume.  However, Nautilus pompilius was observed to briefly swim above and below the odor plume multiple times when greater then 100cm and less then 20cm away from the odor source respectively, suggesting that Nautilus pompilius tracks odors using vertical sensing.(Basil et al, 2000) Interestingly when the rhinophores were blocked Nautilus pompilius was unable to track the odor plume, suggesting that the rhinophores are crucial for locating cartier bracelet of anastasia steele fifty
fake cartier bracelet and tracking an odor. (Basil et al, 2000) However, when Nautilus pompilius is nearby the odor source the lateral digital tentacles seem have a role in determining prey location.  (Ruth et al, 2002)

(Picture 2:  The primitive eye of Nautilus pompilius. The grey triangle just below the eye is the rhinophore. (Basil et al, 2005) Photo taken by bathyporeia on Flickr, and published under the creative commons license.)

Ruth et al, (2002) observed by placing food at the bottom of a tank that Nautilus pompilius further spread its lateral digital tentacles and swam closer to the tank bottom as the food was approached. When the food was very close Nautilus pompilius touched the bottom and started a digging behavior (Basil et al, 2005) by feeling around with its medial digital tentacles. (Ruth et al, 2002) Interestingly when Basil et al, (2005)  pipetted fish scented water onto Nautilus pompilius’s lateral digital tentacles the digging behavior was triggered; suggesting that the lateral digital tentacles have a chemosensory function and may signal when prey is nearby. (Basil et al, 2005) When Nautilus pompilius located the food, the food was grabbed with the medial digital tentacles, transferred to the buccal tentacles, and then brought to the beak. (Ruth et al, 2002) Interestingly, when Ruth et al, (2002) offered food near Nautilus pompilius’s lateral digital tentacles the food was grabbed by the medial digital tentacles, suggesting that the lateral digital tentacles may only be used for chemoreception. Ruth et al, (2002)

In summary cartier bracelet Nautilus pompilius’s rhinophores and lateral digital tentacles are thought to have a specialized chemosensory function and be crucial for locating prey. (Basil et al, 2000) The rhinophores are believed to allow Nautilus pompilius to locate and use vertical sensing to track an odor plume. (Basil et al, 2000) The lateral digital tentacles are thought to detect nearby odors. (Basil et al, 2005) (Ruth et al, 2002) This is thought to signal that prey is nearby, and may cause Nautilus pompilius to switch from a cone of search to a digging behavior. (Basil et al, 2005) (Ruth et al, 2002)