अम्मोनॉइड इसके अंग्रेजी अर्थ का उदाहरण

This suture type is characteristic of Jurassic and Cretaceous ammonoids but extends back all the way to the Permian.

Among molluscs, the ammonoid genus Trachyceras is exclusive to the lower Carnian (i.

This fauna is extremely diverse, including ammonoids, gastropods, bivalves, echinoderms, calcareous sponge, corals, brachiopods, and a variety of less common fossils.

This is evidenced by the global distribution of ammonoids.

The base of the Olenekian is at the lowest occurrence of the ammonoids Hedenstroemia or Meekoceras gracilitatis, and of the conodont Neospathodus waageni.

This event was probably caused by late eruptions of the Siberian Traps and led to extinctions among several groups, especially nektonic and pelagic taxa such as ammonoids and conodonts.

It features at least 7 phyla and 20 distinct metazoan orders, including leptomitid protomonaxonid sponges (previously only known from the Paleozoic), thylacocephalans, crustaceans, nautiloids, ammonoids, coleoids, ophiuroids, crinoids, and vertebrates.

ichthyosaurs, sauropterygians, thallatosaurs), ray-finned fish and many invertebrate groups like molluscs (ammonoids, bivalves, gastropods).

This stage identifies with its own species of ammonoid index fossils, which is how it differs from the preceding Carnian stage.

The environment of the Late Triassic had negative effects on the conodonts and ammonoid groups.

Other animals, such as the ammonoids, insects, and the tetrapods (cynodonts, amphibians, reptiles, etc.

They grew on the shells of living ammonoids.

In the seas, a novel major group of ammonoid cephalopods called clymeniids appeared, underwent tremendous diversification and spread worldwide, then just as suddenly went extinct.