Museum Specimens Reveal New Seahorse-Like Genus via CT Scans and DNA

The team examined seven preserved specimens collected as bycatch between 50 and 125 meters off southern Australia over 65 years. Micro-CT scans revealed fused belly plates and coronets absent in Australyichthys, while ethanol-fixed DNA from the single A. aegis specimen placed it outside Hippocampus on the syngnathid tree. This establishes independent evolution of the seahorse body plan within the family. Convergent evolution here reflects shared ambush predation and male brooding on deep reefs, a pattern repeated across pipefishes and seadragons. The discovery fills a 2,500-kilometer gap in Australian marine biodiversity records and highlights how trawl bycatch can yield new taxa when museum collections are re-examined with modern imaging. No live observations exist, and all material is irreplaceable, limiting behavioral or ecological data. Targeted ROV surveys at the type locality within five years could confirm habitat use and population density, strengthening conservation assessments for these rare syngnathids. Future work should integrate environmental DNA sampling from Spencer Gulf dredge sites to test whether the genus persists undetected, directly informing bycatch mitigation policies in Australian trawl fisheries.