Apteronotus caudimaculosus n. sp. (Gymnotiformes: Apteronotidae), a sexually dimorphic black ghost knifefish from the Pantanal, Western Brazil, with a note on the monophyly of the A. albifrons species complex. Carlos David de Santana Zootaxa 2003 252 1 11 FYRK urn:lsid:zoobank.org:act:E6719288-2C5B-4CAB-932F-B229134A9A72 Actinopterygii Apteronotidae Apteronotus Animalia Apteronotus cuchillo Schultz 1949:69 Gymnotiformes 10 Chordata species cuchillo    CU82193, 4 ex.;  USNM 121587, paratypes, 13 ex.;  USNM 121588, paratypes, 3 ex.;  USNM 121589, paratypes, 11 ex.;  USNM 121590, paratypes, 7 ex.;  USNM 121591, holotype; 923903413 Venezuela 923903436 Venezuela 923903417 Venezuela 923903419 Venezuela 923903425 Venezuela 923903432 Venezuela