Protcycloceratidae is an extinct family of slender, commonly
annulate, members of the cephalopod order Ellesmerocerida that lived during
Kaynak: ProtocycloceratidaeRhynchorthoceras is a Middle Ordovician genus characterized by a rapidly expanded, weakly
annulate orthocone , like the orthoconic section
Kaynak: RhynchorthocerasJolietoceras is a compressed,
annulate, lituiconic nautiloid included in the derived Tarphycerid family, Uranoceratidae . The shell is
Kaynak: JolietocerasEllinoceras is a small, straight,
annulate actinoceratid from the Middle Ordovician of northeastern Siberia with strongly sinuous sutures
Kaynak: EllinocerasThey consist of coumarin
annulate d with furan . Biosynthesis: The biosynthetic pathway is a combination of the shikimate pathway, which
Kaynak: Methoxsalen