Key to the known genera and species of Jurasaidae (adapted from Biffi et al. 2021 and Roza 2021) 1. Pronotum with lateral carina; elytra long, almost completely covering the hind wings, parallel-sided, median edges contiguous to apex, apices flat; tarsomere IV deeply notched.............................. Tujamita plenalatum Rosa et al., 2020 1ʹ. Pronotum without lateral carina; elytra short, exposing apical third of hind wing, with median edges separated and divergent apicad, lateral edges sinuate, apices swollen; tarsomere IV truncate........................ 2 (Jurasai Rosa et al., 2020) 2. Elytra strongly tapered on posterior 2/3; sternite VIII partly exposed................. Jurasai itajubense Rosa et al., 2020 2ʹ. Elytra weakly tapered on posterior 1/3; sternite VIII concealed................................................. 3 3. Maxillary palpus four-segmented; antenna short, reaching basal third of elytra; pronotum widest at middle.............. 4 3ʹ. Maxillary palpus five-segmented; antenna long, reaching half of elytra; pronotum widest at anterior third............... 5 4. Antennal insertions elevated; medial spur (MSP) reaching wing apex; veins MP 3+4 and Cu distinct; anal field conspicuous; parameres spatulate on posterior third, apices flattened; phallus as long as parameres............. J. parahybanum sp. nov. 4ʹ. Antennal insertions flat; medial spur (MSP) not reaching wing apex; veins MP 3+4 and Cu indistinct; anal field inconspicuous; parameres with apices tapered; phallus longer than parameres.......................... J. miraculum Biffi et al., 2021 5. Labrum truncate to slightly emarginated; scutellar shield with posterior margin straight; R 3+4 sinuous................................................................................................ J. digitusdei Rosa et al., 2020 5ʹ. Labrum deeply emarginated; scutellar shield with posterior margin emarginated; R 3+4 straight......................... 6 6. Pronotum with posterior margin slightly rounded; anal notch present; parameres perpendicular to phallus, apices rounded; phallus cylindrical, subapically marginated by a flap..................................... J. vanini Biffi et al., 2021 6ʹ. Pronotum with posterior margin weakly produced posteriorly; anal notch absent; parameres parallel and progressively oblique to phallus, apices strongly tapered, forming sausage-like lobe projecting posteroventrad; phallus with lateral margins straight and gradually convergent apicad....................................................... J. ypauoca Roza, 2021

Published as part of Nunes, João Paulo, Nascimento, Matheus & Pereira-Colavite, Alessandre, 2023, A new species of Jurasai Rosa et al., 2020 and the first record of the family Jurasaidae (Coleoptera: Elateroidea) in the northern Brazilian Atlantic Forest, pp. 524-534 in Zootaxa 5323 (4) on page 531, DOI: 10.11646/zootaxa.5323.4.4, http://zenodo.org/record/8212427