Hi all, I have plans to make a large illustration showcasing the diversity of ammonoids, possibly along with other shelled cephalopods. Something reminiscent to those 'prehistoric animals' lineup posters common for science classrooms, as seen here: https://s-media-cache-ak0.pinimg.com/originals/67/c8/74/67c8745f24e3b71e939f35db3fb493ab.jpg Incidentally, they will be reconstructions and may require a large number of speculative elements, given what we know about ammonoid soft bodies. I would like to emphasize the diversity of lifestyles and habitats, e.g. colorful reef(?) ammonites side by side with streamlined epipelagic species, along with planktonic heteromorphs. I know for sure I will include my personal favorite genera such as Parapuzosia, Placenticeras, and Turrilites. I am also thinking of taking cues from living argonauts and other pelagic planktivorous/gelatinovorous cephalopods. This footage here shows them displaying their flared arm pairs, possibly acting like fins and providing some lift: The issue being, I have no idea which species/genera should fit the designated niches. Does anyone have any recommendations for the following: Tropical reef dweller Algal raft-associated species (if any) Cold-water species (if any) Streamlined open water species, possibly predatory (Placenticeras?) Smaller pelagic species, possibly with iridescent shells Sexually dimorphic species Deep-sea dweller Planktonic genera (Heteromorphs?) Other unique niches perhaps? On the matter of the genera I'd like to include, I still have no idea how to reliably depict Parapuzosia. What sort of ecosystem did it live in? Any guesses on its diet? Furthermore, have we reached any consensus on how aptychi are supposed to function? How about the arms? Any help will be very appreciated.