atrisignum, Creagrutus Myers [G. S.] 1927:116 [Bulletin of the Museum of Comparative Zoology v. 68 (no. 3); ref. 3096] Upper Rio Maranhão, Brazil. Holotype: CAS 41339 [ex IU 17679]. Paratypes: CAS 41340 [ex IU 17680] (7), MCZ 31571 (1). •Valid as Creagrutus atrisignum Myers 1927 -- (Vari & Harold 2001:69 [ref. 25842], Vari & Harold in Reis et al. 2003:122 [ref. 27061], Mirande et al. 2013:763 [ref. 33366], Thomaz et al. 2015:Add. 5 [ref. 33893], Netto-Ferreira & Moreira 2018:255 [ref. 35759]). Current status: Valid as Creagrutus atrisignum Myers 1927. Stevardiidae: Creagrutinae. Distribution: Maranhão River basin in Tocantins River drainage, Brazil. Habitat: freshwater.