n. pl.1.(Zool.) An order of Cephalopoda having four gills. Among living species it includes only the pearly nautilus. Numerous genera and species are found in the fossil state, such as Ammonites, Baculites, Orthoceras, etc.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
Immunocytochemical reaction of a haemocyanin antibody in the midgut gland of Nautilus (Cephalopoda, Tetrabranchiata).
Cytological and enzyme-histochemical investigations on the digestive organs of Nautilus pompilius (Cephalopoda, Tetrabranchiata).
Group of the Molluscous Order Tetrabranchiata," Memoir of the Boston Society of Natural History 1.
Asexual reproduction and larval development in Polydora tetrabranchiata Hartman.