Heteromorphs are ammonoids forming a conch with detached whorls (open coiling) or non‐
planispiral coiling. Such aberrant forms appeared convergently four times within this extinct …

Facultad Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo,
ChileCentro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo, Chile* E-mail …

Since the last review of Jurassic—Cretaceous ammonoid ecology (Westermann, 1990),
much additional work has been done on ammonoid autecology (architecture or …

Epizoans, particularly bryozoans, commonly display conspicuously oriented growth on shell
exteriors of extinct orthoconic nautiloid shells. Such patterns, including monticules and …

The current knowledge about the ammonoid/habitat relation is reviewed and in part newly
interpreted. The autecology of ammonoids, such as ontogeny and habitat, based on …

Taphonomy deals with the differential decay of organismic shapes, tissues, and skeletons
under the influence of biological and physical agents and their fixation in the fossil record …

A diversity gradient and endemic patterns that are a function of latitude are evident in the
ammonoid biogeography of the Pliensbachian. High diversity, Tethyan faunas are …

All attached epifaunal species have the potential to colonize floating substrates such as
driftwood, externally shelled cephalopods, Sargassum-like algae and marine vertebrates …

Because ammonoids have never been observed swimming, there is no alternative to
seeking indirect indications of the locomotory abilities of ammonoids. This approach is …

Ammonites are among the best-known fossils of the Phanerozoic, yet their habitat is poorly
understood. Three common ammonite families (Baculitidae, Scaphitidae, and …