calvus, Synaphobranchus Melo [M. R. S.] 2007:316, Fig. 1 [Copeia 2007 (no. 2); ref. 29141] Brazil, 22°16'S, 39°53'W, depth 1059-1110 meters. Holotype: MNRJ 28279. Paratypes: (many) at AMS, MNHN, MNRJ, MZUSP, USNM. Plus non-type specimens. •Valid as Synaphobranchus calvus Melo 2007 -- (Melo et al. 2009:14 [ref. 30460], Costa & Mincarone 2010:302 [ref. 37483], Costa et al. 2015:1061 [ref. 37495]). Current status: Valid as Synaphobranchus calvus Melo 2007. Synaphobranchidae: Synaphobranchinae. Distribution: Southwestern Atlantic: Brazil endemic. Habitat: marine.