Rhizomolgula is a genus of Ascidian Tunicates in the family Molgulidae.

Species within the genus Rhizomolgula include:Sanamyan, K. (2015). Rhizomolgula Ritter, 1901 . In: Shenkar, N.; Gittenberger, A.; Lambert, G.; Rius, M.; Moreira Da Rocha, R.; Swalla, B.J.; Turon, X. (2015) Ascidiacea World Database. Accessed through: World Register of Marine Species on 2015-12-29. Rhizomolgula globularis (Pallas, 1776) Rhizomolgula japonica Oka, 1926

Species names currently considered to be synonyms: Rhizomolgula arenaria Ritter, 1901: synonym of Rhizomolgula globularis (Pallas, 1776) Rhizomolgula gigantea Redikorzev, 1907: synonym of Rhizomolgula globularis (Pallas, 1776) Rhizomolgula intermedia Michaelsen, 1908: synonym of Rhizomolgula globularis (Pallas, 1776) Rhizomolgula ritteri Hartmeyer, 1903: synonym of Rhizomolgula globularis (Pallas, 1776) Rhizomolgula warpachovskii Redikorzev, 1908: synonym of Rhizomolgula globularis (Pallas, 1776)

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