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ammonite

ammonite (ăm´ənīt), one of a type of extinct marine cephalopod mollusk, related to the nautilus and resembling it in having an elaborately coiled and chambered shell. Unlike the interiors of nautilus shells, the chambers of ammonite shells display intricately shaped septa and sutures. The type included numerous species, which were widely distributed during the Mesozoic era, about 200 million years ago. Ammonites are classified in the phylum Mollusca, class Cephalopoda, subclass Ammonoidea.

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"ammonite." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 17 Dec. 2017 <http://www.encyclopedia.com>.

"ammonite." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (December 17, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/ammonite

"ammonite." The Columbia Encyclopedia, 6th ed.. . Retrieved December 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/ammonite

ammonite

ammonite An extinct aquatic mollusc of the class Cephalopoda. Ammonites were abundant in the Mesozoic era (225–65 million years ago) and are commonly found as fossils in rock strata of that time, being used as index fossils for the Jurassic period. They were characterized by a coiled shell divided into many chambers, which acted as a buoyancy aid. The external suture lines on these shells increased in complexity with the advance of the group.

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"ammonite." A Dictionary of Biology. . Encyclopedia.com. 17 Dec. 2017 <http://www.encyclopedia.com>.

"ammonite." A Dictionary of Biology. . Encyclopedia.com. (December 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ammonite

"ammonite." A Dictionary of Biology. . Retrieved December 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ammonite

ammonite

ammonite Any of an extinct group of shelled cephalopod molluscs. Most ammonites had a spiral shell, and they are believed to be related to the nautiloids, whose only surviving form is the pearly nautilus. They are common as fossils in marine rocks.

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"ammonite." World Encyclopedia. . Encyclopedia.com. 17 Dec. 2017 <http://www.encyclopedia.com>.

"ammonite." World Encyclopedia. . Encyclopedia.com. (December 17, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/ammonite

"ammonite." World Encyclopedia. . Retrieved December 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/ammonite

ammonite

ammonite XVIII. — modL. ammōnītēs, f. L. name cornu Ammōnis ‘horn of Ammon’ given to these fossils from their resemblance to the involuted horn of Jupiter Ammon; see prec. and -ITE.

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"ammonite." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 17 Dec. 2017 <http://www.encyclopedia.com>.

"ammonite." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (December 17, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ammonite-1

"ammonite." The Concise Oxford Dictionary of English Etymology. . Retrieved December 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ammonite-1

ammonite

am·mo·nite / ˈaməˌnīt/ • n. an ammonoid that belongs to the order Ammonitida, typically having elaborately frilled suture lines.

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"ammonite." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 17 Dec. 2017 <http://www.encyclopedia.com>.

"ammonite." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (December 17, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ammonite-0

"ammonite." The Oxford Pocket Dictionary of Current English. . Retrieved December 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ammonite-0

ammonite

ammoniteHamite, samite •marmite • Semite • Vegemite •eremite • Hashemite • Fatimite •chromite • Edomite • sodomite •stalagmite • Elamite • dolomite •Adullamite • dynamite • catamite •Benthamite •termite, thermite •Samnite • sennight • midnight •lignite • selenite • gelignite •kaolinite • Leninite •finite, transfinite •watchnight • fortnight • Sunnite •exurbanite, suburbanite, urbanite •manganite • ammonite • Mennonite •Canaanite • Maronite • bentonite •Irvingite • respite • alexandrite •Arkwright • cartwright • nephrite •playwright • wainwright •wheelwright • millwright •shipwright • copyright • Nazirite •pyrite • eyebright • nitrite • contrite •chlorite • forthright • downright •Fulbright • upright • meteorite •diorite • fluorite •Labourite (US Laborite) • sybarite •Thatcherite • phosphorite • azurite •anchorite • Hitlerite • dolerite •Amorite • Minorite • laterite •Hutterite • birthright

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"ammonite." Oxford Dictionary of Rhymes. . Encyclopedia.com. 17 Dec. 2017 <http://www.encyclopedia.com>.

"ammonite." Oxford Dictionary of Rhymes. . Encyclopedia.com. (December 17, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ammonite

"ammonite." Oxford Dictionary of Rhymes. . Retrieved December 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ammonite