''Leiocephalikon'' is an extinct

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

microsaur Microsauria is an extinct, possibly polyphyletic order of tetrapods from the late Carboniferous and early Permian periods. It is the most diverse and species-rich group of lepospondyls. Recently, Microsauria has been considered paraphyletic, as s ...

in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Gymnarthridae Gymnarthridae is an extinct family of the group Recumbirostra. Gymnarthrids are known from Europe and North America and existed from the Late Carboniferous through the Early Permian. Remains have been found from the Czech Republic, Nova Scotia, I ...

. The

type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ...

is ''Amblyodon problematicum'' named by

John William Dawson Sir John William Dawson (1820–1899) was a Canadian geologist and university administrator. Life and work John William Dawson was born on 13 October 1820 in Pictou, Nova Scotia, where he attended and graduated from Pictou Academy. Of Sco ...

in 1882. Its fossil was found in the

Joggins Formation The Joggins Formation is a Formation (geology), geologic formation in Nova Scotia. It preserves fossils dating back to the Westphalian stage or Moscovian (Carboniferous), Moscovian stage of the Upper Carboniferous Period (geology), period or Penn ...

which hailed from Carboniferous period. Although sometimes regarded as primitive

gymnarthrids Gymnarthridae is an extinct family of the group Recumbirostra. Gymnarthrids are known from Europe and North America and existed from the Late Carboniferous through the Early Permian. Remains have been found from the Czech Republic, Nova Scotia, I ...

, ''Leiocephalikon'' classification is still debated as its fossil is scarce.

References

Gymnarthrids Pennsylvanian tetrapods of North America Paleozoic life of Nova Scotia Fossil taxa described in 1934 {{Paleo-tetrapod-stub