Eukrohniidae  Eukrohniidae is a family of sagittoideans in the order Phragmophora. It consists of a single genus, Eukrohnia von Ritter-Záhony, 1909. The first species of Eukrohniidae, "Eukrohnia hamata", was identified by Karl Möbius in 1875. The genus was named "Eukrohnia" by R. von Ritter-Záhony in 1909 after August David Krohn. The family was named "Eukrohniidae" by Takasi Tokioka in 1965. One of the species, "Eukrohnia fowleri", is bioluminescent.