ammonite

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ammonite

(ăm′ə-nīt′)
n.
1. An extinct cephalopod mollusk of the order Ammonitida of the Permian to Cretaceous Periods, having a thick, usually coiled shell characterized by intricate suture patterns where the septa between individual chambers join the outer shell wall.
2. An ammonoid.

am′mo·nit′ic (-nĭt′ĭk) adj.

ammonite

a name given to a large group of fossil cephalopod molluscs of late Palaeozoic and Mesozoic time that possessed a spiral shell very similar to that of Nautilus.
References in periodicals archive ?
The Cretaceous Ammonoidea of southhern Nigeria and the southern Cameroons.
The ammonoidea of the Plenus Marls and the Middle Chalk.
The affinities of Codazziceras ETAYO-SERNA, 1979 (Cretaceous Ammonoidea).
(2010): Desmoceratidos (Ammonoidea) del Aptiense Inferior (Cretacico Inferior) de la subcuenca de Oliete, Cordillera Iberica Oriental (Teruel, Espana).
Estudio paleontologico de la familia Perisphinctidae Steinman (Ammonoidea).
(1979): Estudio bioestratigrafico (Ammonoidea) del Aaleniense y Bajociense en Asturias.