The fossil species Merothrips dietrichi (Schliephake) comb. n. redescribed and transferred from the genus Heterothrips (Thysanoptera) Author Ulitzka, Manfred R. Author Mound, Laurence text Zootaxa 2017 4231 4 573 576 journal article 36556 10.11646/zootaxa.4231.4.7 b1f6d762-0faa-487a-9ec4-7b61b344f7c3 1175-5326 293129 188062E9-F467-4AA9-B300-ADCC61877B15 Key to the species of Merothripidae from Baltic Eocene amber 1. Antennae 9-segmented; pronotum without any longer setae; apterous. ........................................................... Praemerothrips hoodi - Antennae 8-segmented, pronotum with 1 or 2 pairs of posteroangular setae; slender wings present with two longitudinal veins but without microtrichia .....................................................................................................................................................( Merothrips ) 2 2. Pronotum with 2 pairs of posteroangular setae; interior pair arising from minute cone shaped tubercles ..................... M. balticus - Pronotum with one pair of posteroangular setae.............................................................................................................................. 3 3. Posteroangular setae length 43–52 microns; antennae 200 microns .................................................................................. M. fritschi - Posteroangular setae length 23 microns; antennae 256 microns ...................................................................................... M. dietrichi