Updated diagnoses for the cricket family Trigonidiidae (Insecta: Orthoptera: Grylloidea) and its subfamilies (Trigonidiinae, Nemobiinae), with a review of the fossil record

Morphological diagnoses are given for the cricket family Trigonidiidae and its two monophyletic subfamilies, Trigonidiinae Nemobiinae. Owing to their morphological characters, we transfer extant genus Lissotrachellus Hubbell, 1838 from Gryllidae: Pentacentrinae Trigonidiidae: was type of Lissotrachelini including also Trigonidomimus Caudell, 1912 Tohila 1938 which here transferred incertae sedis. The fossils currently attributed subfamilies reviewed, in order facilitate future phylogenetic studies. Few can actually be classified Nemobiinae or Trigonidiinae, most Cenozoic: oldest nemobiine is Eocene Baltonemobius fossilis Gorochov, 2010 (37.2–33.9 Ma), while representatives crown group date Miocene (20.43–13.65). early Cretaceous Liaonemobius tanae Ren, 1998, originally described listed Gryllidae, proved an Elcanidae. mid-Cretaceous Birmaninemobius hirsutus Xu et al., 2020, Nemobiinae, stem Trigonidiinae.