Kogiidae is a monogeneric family which only contains two living species, K. breviceps and K. sima in the genus Kogia. Velez-Juarbe & al. describe a new species and genus from the late Pliocene of Panama, Nanokogia isthmia, and suggest that:
- Reduction of the spermaceti organ has occurred iteratively in kogiids.
- Extant kogiids diverged around the late Pliocene (later than previously thought).
- Late Pliocene kogiids were morphologically more diverse than extant ones, which could be due to feeding habits.
- Velez-Juarbe J, Wood AR, De Gracia C, Hendy AJW (2015) Evolutionary Patterns among Living and Fossil Kogiid Sperm Whales: Evidence from the Neogene of Central America. PLoS ONE 10(4): e0123909. doi: 10.1371/journal.pone.0123909