[Ebook] 500 freshwater aquarium fish – Killifish – Black-finned Argentine Pearl (Cynolebias nigripinnis)
Many authors recognize two subspecies of C. nigripinnis: C. n. nigripinnis (Black-finned, or Dwarf, Argentine Pearl) and C. n. alexandri (Entre Rio Argentine Pearl). Others—perhaps a majority—consider each one to be a valid species in its own right. While being overall similar to each other, C. n. alexandri males have brownish, almost vertical bands on the body. C. n. nigripinnis lacks the bands but has the characteristic black fins that are indicated in both the scientific and common names.
