... ). The apparent similarity between living nautiluses and ancestral cephalopods, coupled with the more recent diversification of soft-bodied cephalopods from externally shelled ancestors, suggest that nautilus may provide important insights into the evolution of complexity in invertebrate nervous systems...

... over large volumes of relatively unproductive ocean (low power density, Wm −3 ). A survey of locomotor performance among phyla and along an ‘evolutionary continuum’ of cephalopods ( Nautilus, Sepia, Loligo and Illex ) suggests that increasing speed and animal power density are required if animals...

...R. K. O’dor; J. Wells; M. J. Wells ABSTRACT Neutrally buoyant, ultrasonically telemetering, differential pressure transducers were attached to Nautilus pompilius L. to record mantle cavity pressures while the animals were induced to swim in a flume in response to food. Synchronized videotapes...

...Michael Jordan; John A. Chamberlain, Jr; Rebecca B. Chamberlain ABSTRACT Juvenile Nautilus , tested in a high-pressure animal maintenance apparatus, are sensitive to increases in ambient hydrostatic pressure as small as l × 10 5 Nm −2 (= 1 atm = 100kPa). They respond to such pressure increases...

...M. J. Wells; J. Wells ABSTRACT The shell of Nautilus prevents the mantle from playing any part in creating the ventilatory stream. This is generated instead by movements of the collar and funnel folds which fuse to form flaps (the ‘wings’), overlapping below and joined to the head above. The gills...

...W. R. A. Muntz; U. Raj ABSTRACT The anatomy of the eye of Nautilus pompilius Linnaeus was studied, using light and electron microscopy. The outer and inner surfaces of the iris were found to be lined with columnar epithelium bearing microvilli, except for the groove running ventrally from the pupil...