''Archaeothyris'' 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 ...

ophiacodontid Ophiacodontidae is an extinct family of early eupelycosaurs from the Carboniferous and Permian. ''Archaeothyris'', and ''Clepsydrops'' were among the earliest ophiacodontids, appearing in the Late Carboniferous. Ophiacodontids are among the most ...

synapsid Synapsids + (, 'arch') > () "having a fused arch"; synonymous with ''theropsids'' (Greek, "beast-face") are one of the two major groups of animals that evolved from basal amniotes, the other being the sauropsids, the group that includes rep ...

that lived during the

Late Carboniferous Late may refer to: * LATE, an acronym which could stand for: ** Limbic-predominant age-related TDP-43 encephalopathy, a proposed form of dementia ** Local-authority trading enterprise, a New Zealand business law ** Local average treatment effe ...

and is known from

Nova Scotia Nova Scotia ( ; ; ) is one of the thirteen provinces and territories of Canada. It is one of the three Maritime provinces and one of the four Atlantic provinces. Nova Scotia is Latin for "New Scotland". Most of the population are native En ...

. Dated to 306 million years ago, ''Archaeothyris'', along with a more poorly known synapsid called '' Echinerpeton'', are the oldest undisputed synapsids known. The name means ''ancient window'' (Greek), and refers to the opening in the skull, the temporal fenestra, which indicates this is an early synapsid. '' Protoclepsydrops'' also from Nova Scotia is slightly older but is known by very fragmentary materials. Archaeothyris NT small

Description

''Archaeothyris'' was more advanced than the early sauropsids, having strong jaws that could open wider than those of the early reptiles. While its sharp teeth were all of the same size & shape, it did possess a pair of enlarged

canine Canine may refer to: Zoology and anatomy * a dog-like Canid animal in the subfamily Caninae ** '' Canis'', a genus including dogs, wolves, coyotes, and jackals ** Dog, the domestic dog * Canine tooth, in mammalian oral anatomy People with the ...

s, suggesting that it was a carnivore. Archaeothyris' legs were articulated laterally at its pelvis and shoulders, which gave it a sprawling stance. The first toe is smaller than the second.

Classification

''Archaeothyris'' belonged to the family

Ophiacodontidae Ophiacodontidae is an extinct family of early eupelycosaurs from the Carboniferous and Permian. '' Archaeothyris'', and ''Clepsydrops'' were among the earliest ophiacodontids, appearing in the Late Carboniferous. Ophiacodontids are among the m ...

, a group of early pelycosaurs that evolved early in the

. It was one of the earliest and most basal synapsids (the group which includes mammals). Below is a

cladogram A cladogram (from Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an evolutionary tree because it does not show how ancestors are related to ...

modified from the analysis of Benson (2012):

Discovery and paleoecology

Fossils of ''Archaeothyris'' were first described in 1972 from the Joggins fossil cliffs, the same locality in which the early reptiles '' Hylonomus'' and ''

Petrolacosaurus ''Petrolacosaurus'' ("rock lake lizard") is an extinct genus of diapsid reptile from the late Carboniferous period. It was a small, long reptile, and the earliest known reptile with two temporal fenestrae (holes at the rear part of the skull) ...

'' (both of which resemble ''Archaeothyris'') were found. ''Archaeothyris'' lived in what is now

, about 306 million years ago in the Carboniferous Period (

Pennsylvanian Pennsylvanian may refer to: * A person or thing from Pennsylvania * Pennsylvanian (geology) The Pennsylvanian ( , also known as Upper Carboniferous or Late Carboniferous) is, in the International Commission on Stratigraphy, ICS geologic timesca ...

).Hess J.C., Lippolt H.J. (1986): 40Ar/39Ar ages of tonstein and tuff sanidines: new calibration points for the improvement of the Upper Carboniferous time scale. ''Chem Geol'' no 59: pp 143–154 Nova Scotia at this time was a swamp, similar to today's

Everglades The Everglades is a natural region A natural region (landscape unit) is a basic geographic unit. Usually, it is a region which is distinguished by its common natural features of geography, geology, and climate. From the ecological point o ...

Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, a ...

. The "trees" (actually giant club mosses) were very tall, some, such as ''

Lepidodendron ''Lepidodendron'' is an extinct genus of primitive vascular plants belonging to the family Lepidodendraceae, part of a group of Lycopodiopsida known as scale trees or arborescent lycophytes, related to quillworts and lycopsids (club mosses). T ...

'', up to tall. ''Archaeothyris'' and the other early amniotes lived in the moist vegetation on the forest ground, together with the more terrestrially adapted

labyrinthodont "Labyrinthodontia" (Greek, 'maze-toothed') is an informal grouping of extinct predatory amphibians which were major components of ecosystems in the late Paleozoic and early Mesozoic eras (about 390 to 150 million years ago). Traditionally conside ...

amphibians.

References

External links

Transitional Vertebrate Fossils
- includes description of important transitional genera from reptile to mammal (includes a little information about ''Archaeothyris'') {{Taxonbar, from=Q133034 Ophiacodontids Prehistoric synapsid genera Carboniferous synapsids Carboniferous synapsids of North America Transitional fossils Taxa named by Robert R. Reisz Fossil taxa described in 1972 Paleozoic life of Nova Scotia

Description

Classification

Discovery and paleoecology

See also

References

Further reading

External links