On the subject of the Late Jurassic pterosaur biter, Aspidorhynchus,
Wikipedia reports, “Although it would have looked superficially similar to the present day gar, its closest living relative is actually the bowfin.”
Among living taxa,
the closest relative is the arowana, Osteoglossum, an Amazon River surface feeder. This may be one clue as to how several Aspidorhynchus specimens met several Rhamphorhynchus specimens, to their mutual doom.
If I’m not mistaken,
this is a novel hypothesis of interrelationships based on taxon inclusion. If there is an earlier citation, let me know so I can promote it here. Googling the two genera just seems to bring up lists of genera without making a connection between the two.
Agassiz L 1843. Recherches sur les poissons fossiles: 5 vols, with atlas (Neuchâtel).
Blainville HMD de 1818. Poissons fossiles. Nouveau Dictionnaire d’Histoire Naturelle 27: 310–395.
Frey E and Tischlinger H 2012. The Late Jurassic pterosaur Rhamphorhynchus, a frequent victim of the ganoid fish Aspidorhynchus?. PLoS ONE. 7 (3): e31945. Bibcode:2012PLoSO…7E1945F. doi:10.1371/journal.pone.0031945.