The detailed morphological study based on the findings of well-preserved fossil specimens in Eocene Baltic amber revealed two new species, Metoisops michalskii Kim, Taszakowski, and Herczek sp. nov. and Metoisops popovi Kim, Taszakowski, and Jung sp. nov. The morphological information of the extinct genus Metoisops including diagnoses, descriptions of new species, and a species key are provided. The divided fourth antennal segment is depicted. The tribal transfer of Metoisops from Electromyiommini to Gigantometopini is proposed based on major morphological characters, five-six femoral trichobothria, presence of a deep incision between calli, and the structure of parameres. The need for a phylogenetic revision of the internal classification within Isometopinae is also discussed.

Key words: Hemiptera, Heteroptera, Cimicomorpha, Miridae, Isometopinae, classification, jumping tree bugs, Baltic amber.

Junggon Kim [thesv12@gmail.com; ORCID: https://orcid.org/0000-0003-0594-7618 ], 1719 Gyebaek-ro, Jung-gu, Daejeon, Korea. Artur Taszakowski [artur.taszakowski@us.edu.pl; ORCID: https://orcid.org/0000-0002-0885-353X], Aleksander Herczek [aleksander.herczek@us.edu.pl; ORCID: https://orcid.org/0000-0001-6047-5268], and Marzena Zmarzły [marzena. zmarzly@us.edu.pl; ORCID: https://orcid.org/0000-0002-0631-6079], Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Bankowa 9, 40-007 Katowice, Poland. Sunghoon Jung [jung@cnu.ac.kr; ORCID: https://orcid.org/0000-0001-6086-0326 ] (corresponding author), Laboratory of Systematic Entomology, Department of Applied Biology, College of Agriculture and life Sciences, Chungnam National University, 99, Daehak-ro, Daejeon, Korea and Department of Smart Agriculture Systems, College of Agriculture and Life Sciences, Chungnam National University, 99, Daehak-ro, Daejeon, Korea.