Zygadenia

Zygadenia is an extinct genus of archostematan beetles from the Jurassic to Cretaceous. It is considered to be a senior synonym of Notocupes by Kirejtshuk (2020), but other researchers suggest to reserve the genus Zygadenia as a form taxon for isolated elytra that probably belong to the genus Notocupes, while retaining Notocupes as a valid genus for complete body fossils.

Eleven species are included in the genus, after Strelnikova and Yan (2021, 2023). Kirejtshuk (2020) notes that the two Lower Jurassic Australian species Z. westraliensis and Z. martinae possibly merit placement in their own separate genus.

Toarcian (182.7 Ma to 174.1 Ma)

 * Cattamarra Coal Measures, Australia
 * Z. martinae Jarzembowski et al. 2015
 * Z. westraliensis Riek 1968

Tithonian (152.1 Ma To 145.0 Ma)

 * Shar Teeg, Mongolia
 * Z. giebeli Ponomarenko 2014
 * Z. handlirschi Ponomarenko 2014

Berriasian (145.0 Ma To 139.8 Ma)

 * Lulworth Formation, United Kingdom
 * Z. angliae (Giebel 1856)
 * Z. tuberculata (Giebel, 1856)

Hauterivian (132.9 Ma to 129.4 Ma)

 * Weald Clay, United Kingdom
 * Z. angliae (Giebel 1856)
 * Z. floodpagei Jarzembowski et al. 2015
 * Z. simpsoni Jarzembowski et al. 2015

Barremian (129.4 Ma to 125.0 Ma)

 * Sinuiju Formation, North Korea
 * Z. liui Jarzembowski et al. 2015
 * Weald Clay, United Kingdom
 * Z. angliae (Giebel 1856)
 * Z. floodpagei Jarzembowski et al. 2015
 * Z. tuberculata (Giebel 1856)
 * Z. simpsoni Jarzembowski et al. 2015

Aptian (125.0 to ~113.0 Ma)

 * Argun Formation, Russia
 * Z. sinitzae Ponomarenko, 2000
 * Sinuiju Formation, North Korea
 * Z. liui Jarzembowski et al. 2015
 * Yixian Formation, China
 * Z. liui Jarzembowski et al. 2015
 * Zaza Formation, Buryatia, Russia
 * Z. alexrasnitsyni Strelnikova & Yan, 2021