A. Zenopsis cf. conchifer specimen from the Argentine Sea; B. Measurements taken on specimens of Zenopsis cf. conchifer. TL—total length. SL—standard length. BD—body depth. CPD—caudal peduncle depth. CPL—caudal peduncle length. HL—head length. JL—jaw length. OD—orbit diameter. PAL—preanal length. PDL—predorsal length. PL—postorbital length. PPL—prepelvic length. UJL—upper jaw length. (Illustration carried out by the co-author, Vulcano, G.).