Semirostrum
| Semirostrum Temporal range:
| |
|---|---|
| |
| Skull | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Artiodactyla |
| Infraorder: | Cetacea |
| Family: | Phocoenidae |
| Genus: | †Semirostrum Racicot et al., 2014 |
| Type species | |
| †Semirostrum ceruttii Racicot et al., 2014
| |
Semirostrum ceruttii is an extinct porpoise that lived between 5 and 1.5 million years ago (Ma), during the Pliocene epoch. The species is highly distinctive due to the extremely long symphysis on the lower jaw, reaching lengths of 85 centimeters (33.46 in), while that of a modern porpoise is 1–2 centimeters (0.39–0.79 in) long. The main hypothesis regarding its use is that it probed along the sediment in the murky estuaries and shores of what is now California in search of food, which would easily be scooped up the symphysis and into the jaws. The etymology of the name means "half beak", referring to the upper jaw being half the length of the lower.[1]
References
[edit]- ^ Racicot, Rachel A.; Deméré, Thomas A.; Beatty, Brian L.; Boessenecker, Robert W. (31 March 2014). "Unique Feeding Morphology in a New Prognathous Extinct Porpoise from the Pliocene of California". Current Biology. 24 (7): 774–779. Bibcode:2014CBio...24..774R. doi:10.1016/j.cub.2014.02.031. PMID 24631245. S2CID 16335906.
External links
[edit]
Media related to Semirostrum at Wikimedia Commons
Data related to Semirostrum at Wikispecies
