Pseudione, Kossmann, 1881

Horch, Amanda Porciuncula, Huber, Augusto Frederico, Araujo, Paula Beatriz & Ribeiro, Felipe Bezerra, 2018, A new species of Pseudione Kossmann, 1881 (Isopoda, Cymothoida, Bopyridae) parasitizing the lobster Nephropsis aculeata Smith, 1881 (Decapoda, Astacidea, Nephropidae) in the Southwestern Atlantic, Zootaxa 4461 (2), pp. 245-252 : 251-252

Key to species of Pseudione infesting Nephropidae lobsters in the world based on adult females

1. Ventral surface of pleopods tuberculate.................................................... Pseudione nephropsi - Ventral surface of pleopods smooth....................................................................... 2 2. Coxal plates on both sides of the pereomeres 1–4............................................... P. tanimbarensis - Coxal plates only on one side of pereomeres............................................................... 3

3. Marsupium incompletely closed, maxilliped palp extending beyond the distal margin....................... P. atlantica

- Marsupium completely closed, maxilliped palp deeply inset in the distal margin not extending beyond it..................................................................................................... P. ivanklini sp. nov.