Macroacaena Tucker, 1998: 325.
Carinaranina Tucker, 1998: 334.
Type species. Lyreidus succedanus Collins & Wienberg Rasmussen, 1992, by original designation. Type species, by original designation, of Carinaranina is Eumorphocorystes naselensis Rathbun, 1926a.
Species included. Macroacaena alseana (Rathbun, 1932), M. bispinulata (Collins & Wienberg Rasmussen, 1992), M. chica Schweitzer, Feldmann, Fam, Hessin, Hetrick, Nyborg & Ross, 2003, M. franconica Schweigert, Feldmann & Wulf, 2004, M. fudoujii (Karasawa, 2000), M. johnsoni (Rathbun, 1935), M. leucosiae (Rathbun, 1932), M. marionae (Tucker, 1998), M. naselensis (Rathbun, 1926), M. rosenkrantzi (Collins & Wienberg Rasmussen, 1992), M. schencki (Rathbun, 1932), M. succedana (Collins & Wienberg Rasmussen, 1992), and M. venturai Vega, Nyborg, Fraaye & Espinosa, 2007.
Remarks. In Tucker’s PhD thesis (1995), which was distributed in printed form, the new genus Macracaena (1995: 113) was attributed to the Lyreididae. This name, however, is preoccupied by Macracaena Common, 1958, a genus of moth in the family Gelechiidae Stainton, 1854. The generic name of the crab was formally introduced as Macroacaena by Tucker (1998). Schweitzer et al. (2003a: 29) synonymised Carinaranina and Macroacaena on the basis of similarities of the dorsal carapace (see also Schweitzer et al. 2010: 71). The type species of both genera retain ventral details and a re-examination is called for in order to verify the synonymy.
Tucker (1998: 325) noted that Macroacaena ‘possibly’ had the ‘processes to lock the abdomen in the sternum’ and attributed the genus to Lyreidinae. Material of the various species of Macroacaena needs to be re-evaluated to document the presence of hook-like projections.