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Synalpheus regalis
''Synalpheus regalis'' is a species of snapping shrimp that commonly live in sponges in the coral reefs along the tropical West Atlantic.〔 They form a prominent component of the diverse marine cryptofauna of the region.〔 For the span of their entire lives, they live in the internal canals of the host sponge, using it as a food resource and shelter.〔 It has been shown that colonies contain over 300 individuals, but only one reproductive female. Also, larger colony members, most of which apparently never breed, defend the colony against heterospecific intruders.〔 This evidence points towards the first case of eusociality in a marine animal.
The species name "regalis" comes from the Latin ''regalis'' which means royal.〔 This likely stems from the structural hierarchy of the colonies in which only a single female produces all of the offspring.
==Taxonomy==
''Synalpheus regalis'' is a member of the genus ''Synalpheus'', the second largest genus in the snapping shrimp family (Alpheidae), with over 150 species worldwide.〔 The species was discovered by J. Emmet Duffy in 1996 on the Belize Barrier Reef. As of 2013, ''S. regalis'' is one of at least seven recognized species of eusocial shrimp. The other six are ''Synalpheus brooksi'', ''Synalpheus chacei'', ''Synalpheus elizabethae'', ''Synalpheus filidigitus'', ''Synalpheus microneptunus'' and ''Synalpheus rathbunae''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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