Soliclymenia

Soliclymenia is a genus of ammonites from the Late Devonian. "S. paradoxa" has an unusual, triangularly-coiled shell. Additional genera of ammonites with triangular shells are "Kamptoclymenia", "Trigonoshumardites", and "Trigonogastrioceras". "Soliclymenia semiparadoxa", which is known only from the holotype, is semi-triangular, the innermost whorls being circular. Other species of this genus, including "S. solarioides" and "S. recticostata", have a circularly-coiled shell.