see text Sonniniidae is a diverse family of Middle Jurassic ammonites ranging from those with stout evolute shells to those whose shells are sharply rimmed, oxyconic.

The keel, which runs along the middle of the venter, is typically hollow.

The aptychus is shiny with coarse folds (Cornaptychus).

Most lived during the middle Bajocian stage.

[1] Argentina, Canada, China, Germany, Hungary, Morocco, Saudi Arabia, Spain, the United Kingdom.