Basal segments of antennule from which the flagella arise [Butler, T.H.].
Five basal segments of the antenna, from which the antenna arises distally [Perez Farfante and Kensley, 1997].
The basal segments of the antenna, from which the flagellum arises [Chace and Hobbs, 1969].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.