To his honour, his name has been given to three freshwater fish, endemics of Greece: The Trichonis Blenny (Salaria economidisi), the Western Greece Goby, or Economidis Goby (Economidichthys pygmaeus) and the Trichonis Dwarf Goby (Economidichthys trichonis). The latter is considered to be the smallest freshwater fish in Europe - mature at 1.8cm and attaining a maximum length of 3cm.
P.S. Economidis was a former member of the Hellenic Society for the Protection of Nature, and has written several articles for the magazine "Nature" (Fysi). We extend our sincerest condolences to his family.
Trichonis Dwarf Goby. Illustration: Keith Linsell, taken from P.S.Maitland, "Guide to Freshwater Fish of Britain and Europe", Hamlyn, 2000.