The Childrens Museum of Indianapolis - Pleistocene Flat-headed Peccary Skull

''Platygonus compressus'', the flat-headed peccary, is an

extinct Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...

mammal A mammal () is a vertebrate animal of the Class (biology), class Mammalia (). Mammals are characterised by the presence of milk-producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three ...

species from the

Tayassuidae Peccaries (also javelinas or skunk pigs) are pig-like ungulates of the family Tayassuidae (New World pigs). They are found throughout Central and South America, Trinidad in the Caribbean, and in the southwestern area of North America. Peccari ...

family that lived in North and South America during the

Pleistocene The Pleistocene ( ; referred to colloquially as the ''ice age, Ice Age'') is the geological epoch (geology), epoch that lasted from to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was fin ...

. It was first described in 1848 by John L. Leconte.

Description

The flat-headed peccary was about 75 cm (29.5 in) in shoulderheight and about 30 kg (66.1 lb) in weight. Other sources have estimated it to be similar in size to the

wild boar The wild boar (''Sus scrofa''), also known as the wild swine, common wild pig, Eurasian wild pig, or simply wild pig, is a Suidae, suid native to much of Eurasia and North Africa, and has been introduced to the Americas and Oceania. The speci ...

. Sizes differ between the places they have been found. Fossil skulls suggest a small brain, but a good sense of smell and sight. It has been suggested that the

nasal cavity The nasal cavity is a large, air-filled space above and behind the nose in the middle of the face. The nasal septum divides the cavity into two cavities, also known as fossae. Each cavity is the continuation of one of the two nostrils. The nas ...

provided filtration for cold, dry and dusty air. ''Platygonus compressus'' had elongated limbs, a short

humerus The humerus (; : humeri) is a long bone in the arm that runs from the shoulder to the elbow. It connects the scapula and the two bones of the lower arm, the radius (bone), radius and ulna, and consists of three sections. The humeral upper extrem ...

, broad and erect

thoracic vertebrae In vertebrates, thoracic vertebrae compose the middle segment of the vertebral column, between the cervical vertebrae and the lumbar vertebrae. In humans, there are twelve thoracic vertebra (anatomy), vertebrae of intermediate size between the ce ...

and a large

scapula The scapula (: scapulae or scapulas), also known as the shoulder blade, is the bone that connects the humerus (upper arm bone) with the clavicle (collar bone). Like their connected bones, the scapulae are paired, with each scapula on either side ...

. Therefore it has been suggested that this species may have been fleeter on foot than modern peccary species. Otherwise they probably appeared very similar to their closest living relative, the

Chacoan peccary The Chacoan peccary or ''tagua'' (''Catagonus wagneri'' or ''Parachoerus wagneri'') is the last extant species of the genus ''Catagonus''; it is a peccary found in the Gran Chaco of Paraguay, Bolivia, and Argentina. Approximately 3,000 remain i ...

. Genetic analysis conducted in 2017 indicates that the flat-headed peccary is a sister-taxon to a clade comprising extant peccary species, and divergence date estimates suggest that, if extant peccary diversification occurred in South America, then their common ancestor must have dispersed from North America to South America well before the establishment of the Isthmus of Panama, roughly three million years ago.

Distribution and habitat

The flat-headed peccary was widespread throughout North America. Fossils have been found from what is now New York to California, Wisconsin to Mexico and further south in South America. An Individual has even been found as far north as the Yukon. ''Platygonus compressus'' lived in a great variety of habitats and had a wide environmental climate tolerance. This species was known to have roamed North American

boreal forests Taiga or tayga ( ; , ), also known as boreal forest or snow forest, is a biome characterized by coniferous forests consisting mostly of pines, spruces, and larches. The taiga, or boreal forest, is the world's largest land biome. In North Ame ...

and

tropical rainforest Tropical rainforests are dense and warm rainforests with high rainfall typically found between 10° north and south of the Equator. They are a subset of the tropical forest biome that occurs roughly within the 28° latitudes (in the torrid zo ...

s in South America. Remains of the flat-headed peccary, along with

Paleo-Indian Paleo-Indians were the first peoples who entered and subsequently inhabited the Americas towards the end of the Late Pleistocene period. The prefix ''paleo-'' comes from . The term ''Paleo-Indians'' applies specifically to the lithic period in ...

artifacts and the remains of the

giant short-faced bear The Tremarctinae or short-faced bears is a subfamily of Ursidae that contains one living representative, the spectacled bear (''Tremarctos ornatus'') of South America, and several extinct species from four genera: the Florida spectacled bear ('' ...

stag-moose ''Cervalces scotti'', also known as stag-moose, is an extinct species of large deer that lived in North America during the Late Pleistocene epoch. It is the only known North American member of the genus '' Cervalces''. Its closest living relative ...

, and the giant beaver were found in the

Sheriden Cave Sheriden Cave is a Paleo-Indian archaeological site from the late Ice age in Wyandot County, Ohio, United States. Glacial deposits sealed off the cave more than 10,000 years ago. Sheriden Cave is a karst sinkhole on a dolomite ridge that crosses ...

Wyandot County, Ohio Wyandot County is a county located in the northwestern part of the U.S. state of Ohio. As of the 2020 census, the population was 21,900. Its county seat is Upper Sandusky. It was named for the Wyandot Indians, who lived here before and aft ...

. At Megenity Peccary Cave in Indiana, remains of over 650 individual flat-headed peccaries have been found. Of the Indiana site, a paleontologist noted:

“So the question is then: did they live here? Or did they all have a misfortune and die here? It’s a little of both, but it’s mainly that they probably inhabited this cave and rock shelter for most of that time period.”Timmons, Jeanne (July 7, 2015) "From the Depths of an Indiana Cave: A Fossil Treasure Trove," (https://mostlymammoths.wordpress.com/2015/07/07/from-the-depths-of-an-indiana-cave-a-fossil-treasure-trove/)

At Bat Cave in Missouri 98 individuals have been found together. Caves could possibly have been used for protection from extreme weather.

Ecology

Flat-headed peccarys are often found in small groups up to 12 individuals. It is likely that ''Platygonus compressus'' lived in varying herd numbers from 2-100, as well as modern peccary species. It is believed to have been an open forest browser. Fossil teeth show adaptation for coarser vegetation.

References

{{Taxonbar, from=Q2174499 Pleistocene mammals of North America