Fig. 3
From: Jaws of a large belemnite and an ammonite from the Aalenian (Middle Jurassic) of Switzerland
The most common belemnite rostra (Megateuthidae, Belemnitina) from the Opalinum Clay Formation of northern Switzerland. a– d Acrocoelites quenstedti (Oppel 1856), PIMUZ 6082. a dorsal view. b ventral view. c lateral view. d apical view. e–h Acrocoelites conoideus (Oppel 1856), PIMUZ 6078; large specimen. e dorsal view. f lateral view. g ventral view. h apical view