Ammonitida definition of Ammonitida in the Free Online Encyclopedia.

ammonite (ăm`ənīt), one of a type of extinct marine cephalopod cephalopod (sĕf`ələpŏd')
..... Click the link for more information. mollusk, related to the nautilus nautilus, cephalopod mollusk belonging to the sole surviving genus (Nautilus) of a subclass that flourished 200 million years ago, known as the nautiloids.
..... Click the link for more information. 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 Mollusca (məlŭs`kə)
..... Click the link for more information. , class Cephalopoda, subclass Ammonoidea.

ammonite¹

1. any extinct marine cephalopod mollusc of the order Ammonoidea, which were common in Mesozoic times and generally had a coiled partitioned shell. Their closest modern relative is the pearly nautilus

2. the shell of any of these animals, commonly occurring as a fossil

ammonite²

1. an explosive consisting mainly of ammonium nitrate with smaller amounts of other substances, such as TNT

2. a nitrogenous fertilizer made from animal wastes

ammonite [′a·mə‚nīt]

(materials)

An explosive containing 70-95% ammonium nitrate.

(paleontology)

A fossil shell of the cephalopod order Ammonoidea.

ammonite (redirected from Ammonitida)

ammonite
(redirected from Ammonitida)