แหล่งที่มา WikiPedia: Kraussina http://fossilworks.org/bridge.pl?a=taxonInfo&taxon... http://www.irmng.org/aphia.php?p=taxdetails&id=105... https://www.itis.gov/servlet/SingleRpt/SingleRpt?s... https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwt... https://www.gbif.org/species/2252521 https://www.inaturalist.org/taxa/645055 https://www.marinespecies.org/aphia.php?p=taxdetai...
