Aegidae White, 1850

Shimomura, Michitaka & Bruce, Niel L., 2019, A new species of the mesopelagic isopod genus Xenuraega Tattersall, 1909 (Crustacea: Isopoda: Aegidae) from Japan, the second species in the genus, Zootaxa 4683 (3), pp. 431-438 : 432

Family Aegidae White, 1850

Remarks. Bruce (2009, fig. 7) showed that the Aegidae is basally divided into two major clades, one containing Aega Leach, 1815 , Aegiochus Bovallius, 1885 and Aegapheles Bruce, 2009 , the other containing Alitropus Milne Edwards, 1840 , Rocinela Leach, 1818 , Syscenus Harger, 1880 and Xenuraega Tattersall, 1909 . In that analysis Xenuraega is the sister taxon to Syscenus , and these two genera are sister to Rocinela . Both genera lack a frontal lamina and have an elongate pleon that has all pleonites with free lateral margins, none being posteriorly directed.