Bizarre egg structure uncovers a new family of Plecoptera (Insecta) from mid-Cretaceous Burmese amber Author Chen, Zhi-Teng https://orcid.org/0000-0002-6331-8978 School of Grain Science and Technology, Jiangsu University of Science and Technology, Zhenjiang, 212004, China 741208116@qq.com text Fossil Record 2022 2022-02-15 25 1 75 82 http://dx.doi.org/10.3897/fr.25.81862 journal article http://dx.doi.org/10.3897/fr.25.81862 2193-0074-1-75 C905FCB078804990931D8BCC98CD85C3 B0D3E080738957538C66848DDDC4A53D Perspicuusoperlidae fam. nov. Type genus. Perspicuusoperla gen. nov. Etymology. The first part of the compound noun refers to the transparent egg and is derived from Latin 'perspicuus' ; the second part 'perlidae' refers to the stonefly family Perlidae Latreille, 1802. Diagnosis. Triocellate; maxillary palp slender, apical segment unmodified; labial palp short, apical segment slightly shortened; cervical gills invisible. Legs with two giant apical tibial spurs; first two tarsal segments shortest, with developed euplantulae; arolium without setae. In forewings, ScP joining into RA after ra-rp; h stout and with regular obliquity; RA not reaching wing apex; RP originating at basal ⅓ of RA and with three branches; two crossveins present between RA and RP; CuA with four branches, two posterior branches fused basally; CuP and AA1 simple; AA2 appears unforked and abruptly curved backwards at apical half; hind wings with extremely broad and multifolded anal area. Abdominal segments unmodified; paraprocts sclerotized and thumb-shaped; subgenital plate broad, exceeding posterior margin of tergum 10. Cerci slender, membranous and with multiple segments. Egg mass with dozens of uniformly oriented cylindrical eggs; each egg with very short collar, membranous and transparent chorion, without anchor and pedicel.