11. The suture has an angular ventral saddle, broad shallow lateral lobe, and a dorsal lobe . 12. There are low nodes on the flanks and the suture is slightly sinous but with a prominent dorsal lobe . 13. In " E . melaphareus ", an inconspicuous patch exists on the dorsal lobe of the caudal fin. 14. The ventral lobe is moderately wide, lanceolate or linguate, tongue-shaped; the dorsal lobe deep and narrow. 15. "Acrimeroceras " has a shell like that of " Paratornoceras " with biconvex growth lines and constrictions and simple dorsal lobe . 16. During maturation, the ventral bud flips to the other side of the gut tube ( arrow ) where it typically fuses with the dorsal lobe . 17. The exposed suture has four primary lobes on either side; the internal dorsal lobe is not cruciform ( i . e . shaped in a cross ). 18. The suture is simple, with a broad ventral saddle, broad lateral lobe, a dorso-lateral saddle, and a moderately deep hidden dorsal lobe . 19. The species was first specific epithet " praeustus " is Latin; meaning " burnt at the tip ", in reference to its black dorsal lobe . 20. It grows to a length of 5.9 cm and can be distinguished from its congeners by an inconspicuous patch exists on the dorsal lobe of the caudal fin.
