am·mo·noid

(ăm′ə-noid′)

An extinct cephalopod mollusk of the subclass Ammonoidea of the Devonian to Cretaceous Periods, having a straight or coiled chambered shell characterized by more or less intricate suture patterns where the septa between individual chambers join the outer shell wall.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ammonoid

(ˈæməˌnɔɪd)

any of the extinct group of sea-dwelling cephalopod molluscs with coiled and chambered shells

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

am•mo•noid

(ˈæm əˌnɔɪd)

n.

ammonite.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

ammonoid - one of the coiled chambered fossil shells of extinct mollusks

ammonite

fossil - the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil

Mentioned in

References in periodicals archive

207-251 in Ammonoid Paleobiology: from Anatomy to Ecology, Topics in Geobiology 43, C.

Shaving a shell: Effect of manipulated sculpture and feeding on shell growth and sculpture development in Nucella lamellosa (Muricidae: Ocenebrinae)

Furnish and Glenister (1970) described the Permian ammonoid Cyclolobus from the Salt Range.

Facies analysis and dynamic depositional modelling of the Upper Permian Chhidru Formation, Salt Range, Upper Indus Basin, Pakistan

Through the climatic changes, conodont and ammonoid faunae were initially able to recover very quickly during the Early Triassic as unusually short-lived species emerged.

Ups and downs of biodiversity after mass extinction unveiled

It is difficult to compare these ammonoid assemblages with the European standards because of the absence of respective data.

Sea-level changes recorded by cerium anomalies in the Late Jurassic (Tithonian) black rock series of Qiangtang basin, north-central Tibet

A new prodromitid ammonoid genus from the Hannibal Shale (Lower Mississippian) of Missouri.

A case study in paleoecology from the Mississippian of Missouri, with a focus on chondrichthyan teeth

The minimum test was used by Jablonski (1987, 1994) to test Cope's Rule among Cretaceous molluscs and by Boyajian and Lutz (1992) to analyze the evolution of sutural complexity in ammonoid cephalopods.

Contrasting the underlying patterns of active trends in morphologic evolution

Emergence and collapse of the Frasnian conodont and ammonoid communities in the Holy Cross Mountains, Poland.

A large Late Devonian arthrodire (Vertebrata, Placodermi) from Poland

However, the problem associated with the identification of the Jurassic - Cretaceous boundary persists for shallow water marine and continental sedimentary successions in which biostratigraphic data are derived from several groups of benthic macrofossils, foraminifera, ostracods and charophytes that are uncorrelated to ammonoid or planktonic zonations.

New insights about the Upper Jurassic--Lower Cretaceous sedimentary successions from Asturias (NW Iberian Peninsula)

This particular ammonoid is from the SouthPark Mall in Charlotte, North Carolina.

About the cover

For several more years, Tim, focusing increasingly on the marine Triassic and its ammonoid fauna, divided his field time between the Arctic Islands and northeastern British Columbia, where the upper part of the Triassic stratigraphic column is particularly well developed.

Edward Timothy Tozer (1928-2010)

Color patterns in ammonoids. In Ammonoid Paleobiology.

Colour patterns on Silurian orthocerid and pseudorthocerid conchs from Gotland--palaeoecological implications

(2014) review the stratigraphic distribution of the Hauterivian-Albian ammonoid species in the Maestrat Basin (E Spain), providing an updated and comprehensive biostratigraphic framework as a reference for the analysis of the Lower Cretaceous strata of the Maestrat Basin.

Palaeodiversity and Palaeoecology of Iberian Ecosystems. New insights into the phanaerozoic biotas from Spain and Portugal