title: An exceptionally well-preserved Eocene dolichopodid fly eye: function and evolutionary significance.
abstract: The exceptionally preserved eyes of an Eocene dolichopodid fly contained in Baltic amber show remarkable detail, including features at micrometre and submicrometre levels. Based on this material, we establish that it is likely that the neural superposition compound eye existed as far back as 45 Ma. The ommatidia have an open rhabdom with a trapezoidal arrangement of seven rhabdomeres. Such a structure is uniquely characteristic of the neural superposition compound eye of present-day flies. Optical analysis reveals that the fossil eyes had a sophisticated and efficient optical system.
authors.affiliation: Gunma Museum of Natural History, 1674-1 Kamikuroiwa, Tomioka, Gunma 370-2345, Japan. tanaka@gmnh.pref.gunma.jp
authors.forename: Gengo
authors.initials: G
authors.lastname: Tanaka
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Parker
authors.forename: David J
authors.initials: DJ
authors.lastname: Siveter
authors.forename: Haruyoshi
authors.initials: H
authors.lastname: Maeda
authors.forename: Masumi
authors.initials: M
authors.lastname: Furutani
mesh_terms: D018647:Amber; D000818:Animals; D005075:Biological Evolution; D004175:Diptera / Q000033:anatomy & histology* / Q000235:genetics*; D005580:Fossils
chemical_list: D018647:Amber