Elachista utonella Frey, 1856

Elachista utonella Frey, 1856: 300 . Type locality: Switzerland, Zürich, Uetliberges (Frey 1856: 301). Neotype ♂ designated by Traugott-Olsen (1974: 262), in NHMUK.

Elachista caricis Stainton, 1859: 155 . Type locality: England, Ranworth. Syntypes not stated. Synonymy with E. paludum stated at least by Wocke (1876: 327).

Elachista paludum Frey, 1859: 283 . Type locality: England, Norfolk, Ranworth Broad near Norwich (Frey 1859: 300). Lectotype ♂ designated by Traugott-Olsen (1974: 263), in NHMUK. Synonymized by Traugott-Olsen (1974: 262).

Elachista palustrella Morris, 1870: 225, pl. 129, fig. 11. Type locality: [England], Ranworth, Fens. Undefined number of syntypes, auctioned, traces lost. Synonymized by Bradley (1972: 17).

Elachista carinisella Morris, 1870: 225 . Type locality: [England], Ranworth, Beccles. Holotype in Coll. R.S. Edleston, inherited by his son (Horn & Kahle 1935); current depository unknown. Synonymized by Bradley (1972: 17).

Biselachista utonella: Traugott-Olsen & Nielsen (1977: 266) .

Subgenus: Elachista; tetragonella species group.

Distribution: Palearctic. Austria, China, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Japan, Latvia, Lithuania, Poland, Russia (European part, Siberia, E. Russia), Norway, Slovakia, Slovenia, Spain, Sweden, Switzerland, U.K. (England, Scotland, Wales), Ukraine.

Larval host plant(s): Juncus gerardii Loisel (Juncaceae), Carex acutiformis Ehrh., C. brizoides L., C. distans L., C. disticha Hudson, C. echinata Murray, C. elata All., C. flacca Schreber, C. hirta L., C. muricata L., C. paniculata L., C. remota L., C. riparia Curtis, C. spicata Hudson, C. vesicaria L., Scirpus sylvaticus L. ( Cyperaceae) (e.g., Hauder 1917; Lhomme 1951; Wörz 1957; Szöcs 1977; Buszko 1990b; Emmet & Heath 1991; Parenti & Varalda 1994).

Figs.: Traugott-Olsen & Nielsen (1977), Biesenbaum (1995), Bland (1996), Parenti & Pizzolato (2015b).