adelum, Sicydium Bussing [W. A.] 1996:820, Figs. 1-3 [Revista de Biología Tropical v. 44 (no. 2); ref. 22890] Río Schui, tributary of Río Telire, Sixalo drainage neat Costa Rica-Panama border, 9°30'06'N, 83°00'04"W, elevation 90 meters. Holotype: LACM 45941-1. Paratypes: UCR 214-18 (2), 289-4 (1), 374-10 (was 24, now 10), 894-14 (2), 1126-25 (5), 1141-15 (9), 1294-24 (1), 1299-24 (164, 7 c&s), 1352-17 (9), 1372-7 (4), 1373-7 (2), 1394-8 (1); LACM 45941-2 (1), 45942-1 (14), 45943-1 (12). Type catalog: Angulo et al. 2015:383 [ref. 35212]. •Valid as Sicydium adelum Bussing 1996 -- (Bussing 1998:400 [ref. 24179], Murdy & Hoese 2003:1795 [ref. 27111], Kullander in Reis et al. 2003:662 [ref. 27061], Van Tassell 2011:145 [ref. 31732], de Lucena et al.2013:142 [ref. 32517], Angulo et al. 2013:1009 [ref. 33194], Parenti 2021:414 [ref. 38603]). Current status: Valid as Sicydium adelum Bussing 1996. Oxudercidae: Sicydiinae. Distribution: Western Atlantic: Costa Rica. Habitat: freshwater, brackish, marine.