DistributionRead full entry
Range DescriptionThis species has a discontinuous distribution, being found on Bioko Island (Equatorial Guinea), the Niger Delta, and from a small area roughly between the Lefini and lower River Sangha in the Republic of Congo (Groves in press; Grubb in press). It ranges in elevation to at least 1,500 m asl, and perhaps even 1,800 m on Bioko (Grubb et al. in press). The ranges of the three subspecies are as follows:
P. p. pennantii is endemic to the island of Bioko, Equatorial Guinea, where it is now restricted mainly to the south-west of the island with a range of less than 500 kmÂ² (Butynski and Koster 1994; Hearn and Mora 2001; Hearn et al. 2006). There are no confirmed historical or present records from Pico Basile (contra the map in Hearn et al. 2006).
P. p. bouvieri is known to occur on the right bank of the Congo River, along the lower reaches of the Alima to the mouth of the Likouala-aux-Herbes (i.e., west of the Sangha River), tributaries of the lower Congo River, in Republic of Congo (Gautier-Hion et al. 1999; Grubb et al. in press). However, records from Inoni, Lefini Reserve (see Groves in press), at 3ÂºS, 15Âº30?E, some way south of the known distribution, require confirmation.
P. p. epieni is present between the Forcados-Nikrogha Creek and the Sagbama-Osiama-Agboi Creek in the marsh forest of the Niger Delta, Nigeria (Grubb and Powell 1999; Werre 2000).