Leucothoidae

{{Short description|Family of crustaceans}}

{{Automatic taxobox

| image = Leucothoe incisa.jpg

| image_caption = Leucothoe incisa

| taxon = Leucothoidae

| authority = Dana, 1852 {{ITIS |id=94196 |taxon=Leucothoidae}}

| display_parents = 2

| synonyms = Anamixidae Stebbing, 1897

| synonyms_ref =  {{cite web |url=http://www.crustacea.net/crustace/amphipoda/leucothoidae/intro.htm |title=Australian Amphipoda: Leucothoidae |author=J. K. Lowry, P. B. Berents & R. T. Springthorpe |publisher=Australian Museum |date=October 2, 2000 |accessdate=May 22, 2010 |archive-url=https://web.archive.org/web/20160304002349/http://www.crustacea.net/crustace/amphipoda/leucothoidae/intro.htm |archive-date=March 4, 2016 |url-status=dead }}

}}

Leucothoidae is a family of amphipods. It contains 138 species in 5 genera:{{cite journal |title=Leucothoidae |author=Kristine N. White & James Darwin Thomas |year=2009 |journal=Zootaxa |volume=2260 |pages=494–555 |url=https://www.mapress.com/zootaxa/2009/f/z02260p555f.pdf |format=PDF}}

• Anamixis Stebbing, 1897 – 21 species
• Leucothoe Leach, 1814 – 98 species
• Nepanamixis Thomas, 1997 – 4 species
• Paranamixis Schellenberg, 1938 – 13 species
• Paraleucothoe Stebbing, 1899 – 2 species

Males undergo a profound transformation when they reach sexual maturity, turning from the "leucomorph" state to the "anamorph" state. Before this transformation was recognised in 1983,{{cite journal |title=Transformation of the Leucothoides morph to the Anamixis morph (Amphipoda) |author=James Darwin Thomas & J. Laurens Barnard |journal=Journal of Crustacean Biology |volume=3 |issue=1 |year=1983 |pages=154–157 |jstor=1547860 |doi=10.2307/1547860}} females and immature males were described in the genus Leucothoides (Leucothoidae), and mature males were described in the genera Anamixis, Paranamixis and Nepanamixis (Anamixidae). The genus Leucothoides may still be used for leucomorphs of species whose anamorph has not yet been identified.