Parapharyngodon Chatterji, 1933

Ferreira, Antonio Carlos Santos, Vieira, Fabiano Matos, Silva, Diego César Nunes Da, Ribeiro, Leonardo Barros, Ferreira, Jayelen Alves & Muniz-Pereira, Luís Cláudio, 2021, Parapharyngodon hispidus n. sp. (Nematoda: Pharyngodonidae) in Tropidurus hispidus (Spix) (Squamata: Tropiduridae) from Caatinga Biome of the Vale do São Francisco, state of Pernambuco, Brazil with a key for the Neotropical species of the genus Parapharyngodon Chatterji, Zootaxa 4980 (1), pp. 185-200 : 197

Key to the Neotropical species of the genus Parapharyngodon Chatterji

1. Males with smooth anterior cloacal lip.................................................................... 2

- Males with echinate anterior cloacal lip................................................................... 7

2. Males with unpaired post cloacal papillae.................................................................. 3

- Males without unpaired postcloacal papillae............................................................... 6

3. Males with spicule larger than 80 µm ............................................................ P. sceleratus

- Males with spicule smaller than 80 µm .................................................................... 4

4. Males with 4 pairs of caudal papillae, blunt spicule tip, and females with post bulbar ovaries................... P. silvoi

- Males with 3 pairs of caudal papillae, sharp spicule tip, and females with pre bulbar ovaries.......................... 5

5. Males with pre cloacal papillae................................................................ P. verrucosus

- Males without pre cloacal papillae............................................................... P. largitor

6. Males with 3 pairs of caudal papillae, and eggs with eggshell thin and smooth........................... P. alvarengai

- Males with 4 pairs of caudal papillae, and eggs with eggshell thick and punctated..................... P. hispidus n. sp.

7. Males with unpaired post cloacal papilla.......................................................... P. riojensis

- Males without unpaired post cloacal papilla................................................................ 8

8. Males with 4 pairs of caudal papillae, spicules larger than 80 µm; and females with spike stout tail end................. 9

- Males with 3 pairs of caudal papillae, spicules smaller than 80 µm; and females with conical tail end, without spike...... 10

9. Mature females with pre bulbar ovary.............................................................. P. bainae

- Mature females with post bulbar ovary........................................................ P. sanjuanensis

10. Males with pre cloacal papillae.................................................................. P. politoedi

- Males without pre cloacal papillae................................................................. P. hugoi