Two new polyploid Xenopus species from western Uganda

Area of Science:

• Herpetology
• Zoology
• Genetics

Background:

• The anuran genus Xenopus is known for its diverse species, particularly in African freshwater ecosystems.
• Previous research has identified various Xenopus species with different ploidy levels, indicating complex evolutionary histories.

Purpose of the Study:

• To describe and document two newly discovered species within the anuran genus Xenopus.
• To characterize the ploidy levels and geographic distribution of these new species.

Main Methods:

• Field surveys were conducted in western Uganda, specifically in the Semliki Valley and near Lake Bunyoni.
• Morphological and cytogenetic analyses were performed to identify and differentiate the new species.

Main Results:

• Xenopus ruwenzoriensis sp.n. was identified in the Semliki Valley with a hexaploid chromosome number of 108.
• A second new Xenopus species, Xenopus species nova, was found near Lake Bunyoni with a tetraploid chromosome number of 72.

Conclusions:

• The discovery of these two new species highlights the significant, yet under-explored, biodiversity of anurans in western Uganda.
• The distinct ploidy levels (hexaploid and tetraploid) of the new species suggest unique evolutionary trajectories within the Xenopus genus.