ammonoid


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Related to ammonoid: ammonite, Ammonoidea

ammonoid

[′a·mə‚nȯid]
(paleontology)
A cephalopod of the order Ammonoidea.
References in periodicals archive ?
(1) Ammonoids have an exceptionally good fossil record.
It was his work in the Canadian Arctic Islands, beginning in 1954, that laid the foundation for his subsequent brilliant career as a paleontologist and biostratigrapher specializing in the now-extinct class of coiled, marine molluscs known as ammonoids.
During the Devonian Period, the ammonoid cephalopods radiated and diversified and they survived repeated episodes of mass extinction followed by rapid diversification.
This is the most prolific formation in terms of ammonoid content of all the lithostratigraphic units studied (e.g., Moreno-Bedmar et al., 2010a).
The high values of redox and palaeoproductivity proxies of the studied section are very well correlated by ammonoid biostratigraphy with condensed lithofacies from outer-shelf to upper slope environments of the Internal Prebetic (Oloriz et al, 2002; 2004).
(2006): The Early Triassic ammonoid recovery: paleoclimatic significance of diversity gradients.
The Liostrea species were found attached to Ammonoids at the shores of Pangea Sea (Greenland), the Salt Range (Pakistan), and Spiti (India), living in open euhaline waters.
The stratigraphically valuable invertebrates, ammonoids, are missing in those deposits, and conodonts are very rare, being represented by a shallow-water polygnathid assemblage.