''Crossvallia'' is an extinct

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

penguin Penguins ( order Sphenisciformes , family Spheniscidae ) are a group of aquatic flightless birds. They live almost exclusively in the Southern Hemisphere: only one species, the Galápagos penguin, is found north of the Equator. Highly adapt ...

s. It includes two

species In biology, a species is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of ...

, ''C. unienwillia'' and ''?C. waiparensis''. Their anatomy suggests that the genus is closely related to the Anthropornithinae.

Taxonomy

Order

Sphenisciformes Penguins (order Sphenisciformes , family Spheniscidae ) are a group of aquatic flightless birds. They live almost exclusively in the Southern Hemisphere: only one species, the Galápagos penguin, is found north of the Equator. Highly adapt ...

* Family

Spheniscidae Penguins (order Sphenisciformes , family Spheniscidae ) are a group of aquatic flightless birds. They live almost exclusively in the Southern Hemisphere: only one species, the Galápagos penguin, is found north of the Equator. Highly adapte ...

**Genus ''Crossvallia''

† A dagger, obelisk, or obelus is a typographical mark that usually indicates a footnote if an asterisk has already been used. The symbol is also used to indicate death (of people) or extinction (of species). It is one of the modern descendan ...

***''C. unienwillia''

Tambussi ''et al.'', 2005 ***''C. waiparensis''

Mayr ''et al.'', 2019 ''C. unienwillia'' was the first of the genus to be described, whose remains were recovered from and named after the

Late Paleocene The Thanetian is, in the ICS Geologic timescale, the latest age or uppermost stratigraphic stage of the Paleocene Epoch or Series. It spans the time between . The Thanetian is preceded by the Selandian Age and followed by the Ypresian Age (part ...

Cross Valley Formation on

Seymour Island Seymour Island or Marambio Island, is an island in the chain of 16 major islands around the tip of the Graham Land on the Antarctic Peninsula. Graham Land is the closest part of Antarctica to South America. It lies within the section of the isla ...

, Antarctica. It measured about . In August 2019, a new species of ''Crossvallia'', ''C. waiparensis'', was described based on leg bone fossils from

Waipara Waipara is a small town in north Canterbury, New Zealand, on the banks of the Waipara River. Its name translates to "Muddy Water", ''wai'' meaning water and ''para'' meaning mud. It is at the junction of state highways 1 and 7, 60 kilometre ...

New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 List of islands of New Zealand, smaller islands. It is the ...

. It measured about 160 cm (5.2 ft) and weighed around 70–80 kg, being about 154-176 lb. This is significantly large, considering the largest extant penguin species, the Emperor penguin, can be roughly around 121.9 cm, and weigh up to almost 36 kg. It is thought to have lived in the final of

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of ...

and

Paleocene The Paleocene, ( ) or Palaeocene, is a geological epoch that lasted from about 66 to 56 million years ago (mya). It is the first epoch of the Paleogene Period in the modern Cenozoic Era. The name is a combination of the Ancient Greek ''pal ...

66–56 million years ago, and close relatives of ''C. waiparensis'' may have lived in the

Antarctic The Antarctic ( or , American English also or ; commonly ) is a polar region around Earth's South Pole, opposite the Arctic region around the North Pole. The Antarctic comprises the continent of Antarctica, the Kerguelen Plateau and o ...

. The fossils were discovered in 2019 by amateur

palaeontologist Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch (roughly 11,700 years before present). It includes the study of fossi ...

Leigh Love.

References

{{Taxonbar, from=Q30692744 Extinct penguins Bird genera Paleocene birds Prehistoric birds of Antarctica Paleogene Antarctica Fossils of Antarctica Fossil taxa described in 2005