TL/DR: Anyone interested in comparing evolution across fishes should consider deep-benthic and deep-pelagic environments as distinct entities

All images in thread from NOAA Digital Collections @noaacomms.noaa.gov

What's similar: greater emphasis on elongate body shapes vis-a-vis shallow marine settings

What's different: mechanisms of accruing body shape diversity, from evolutionary rates to colonization pathways

Here we use the FishShapes dataset to uncover similarities and differences in body shape diversification across deep-sea fishes from pelagic and benthic habitats