Parapharyngodon Chatterji, 1933

Sousa-Silva, Charles De, Alcantara, Edna Paulino, Ferreira-Silva, Cristiana, Morais, Drausio Honorio & Cascon, Paulo, 2024, A new species of Parapharyngodon (Oxyuroidea: Pharyngodonidae) infecting Corythomantis greeningi (Anura: Hylidae) from Northeast Brazil, Journal of Natural History 58 (45 - 48), pp. 2219-2236 : 2231-2232

Key to the Neotropical species of the genus Parapharyngodon Chatterji

1. Males with blunt-type spicule .............................................. .............................................. P. silvoi

1’. Males with sharp-type spicule ......................................................................................................... 2

2. Males with echinate anterior anal lip .......................................................................................... 3

2’. Males with smooth anterior anal lip ............................................................................................ 8

3. Unpaired post-anal papilla absent ................................................................................................ 4

3’. Unpaired post-anal papilla present ............................................................................ P. riojensis

4. Males with lateral alae present ...................................................................................................... 5

4’. Males without lateral alae .................................. .................................. P. pereiramendoi sp. n.

5. Males with the presence of a genital cone ............................................................................... 6

5’. Males without the presence of a genital cone ........................................................................ 7

6. Males with triangular oral opening surrounded by six well-developed labial papillae; females with oval oral opening surrounded by six flattened lips; flanges of the anterior anal lip well developed, with the presence of a papilla-like structure on the ventral surface of the genital cone .................................................................................. P. hugoi

6’. Triangular oral opening surrounded by three bilobed lips in both sexes; males with six labial papillae present, females, four; flanges of the anterior anal lip delicate ................ ................................................................................................................................................... P. politoedi

7. Females with ovary in prebulbar position .................................................................. P. bainae

7’. Females with ovary in postbulbar position .................................................... P. sanjuanensis

8. Unpaired post-anal papilla absent ................................................................................................ 9

8’ Unpaired post-anal papilla present ............................................................................................ 10

9. Males with the presence of a genital cone .............................. .............................. P. curupira

9’. Males without the presence of a genital cone ...................................................................... 11

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

10’. Males with spicule smaller than 80 μm .................................................................................... 12

11. Males with three pairs of caudal papillae, and eggs with eggshell thin and smooth ... ................................................................................................................................................ P. alvarengai

11’. Males with four pairs of caudal papillae, and eggs with eggshell thick and punctated .................................................................................................................................................... P. hispidus

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

12’. Males without pre cloacal papillae ....................................... ....................................... P. largitor