Zygadenia is an extinct genus of beetles in the family Ommatidae, containing the following species: \n* Zygadenia brachycephalus (Ponomarenko, 1994) \n* Zygadenia caducus (Ponomarenko, 1969) \n* Zygadenia caudatus (Ponomarenko, 1966) \n* Zygadenia cellulosus (Ponomarenko, 1969) \n* Zygadenia crassus (Ponomarenko, 1969) \n* Zygadenia diazromerali Soriano & Delclòs, 2006 \n* Zygadenia dundulaensis (Ponomarenko, 1994) \n* Zygadenia elegans (Ponomarenko, 1994) \n* Zygadenia excellens (Ponomarenko, 1966) \n* Zygadenia exiguus (Ponomarenko, 1994) \n* Zygadenia foersteri (Ponomarenko, 1971) \n* Zygadenia homorus (Lin, 1986) \n* Zygadenia huangyadiensis (Wang & Liu, 1996) \n* Zygadenia issykkulensis (Ponomarenko, 1969) \n* Zygadenia khetanensis (Ponomarenko in Cromov et al., 1993) \n* Zygadenia ki