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Janusiscus

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Janusiscus
Temporal range: 415 Ma
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Infraphylum: Gnathostomata
Genus: Janusiscus
Giles et al., 2015
Species:
J. schultzei
Binomial name
Janusiscus schultzei
Giles et al., 2015

Janusiscus schultzei is an extinct gnathostome vertebrate dating from the Early Devonian period in Siberia, approximately 415 million years ago. It may be the sister group of the last common ancestor of Chondrichthyes (cartilaginous fish) or Osteichthyes (bony fish). This makes J. schultzei a sister species to all living jawed vertebrates. The species name is in honor of Hans-Peter Schultze; the genus named after Janus, the Roman god of duality.[1]

Taxonomy

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The following cladogram is simplified from Giles et al., 2015:[1]

 Galeaspida

 Osteostraci

 Gnathostomata 

 Antiarchi

 Petalichthyida

 Ptyctodontida

 Rhenanida

 Arthrodira

 Janusiscus schultzei

 Osteichthyes (Bony fish and tetrapods)

 Acanthodii

 Chondrichthyes (Cartilaginous fish)

References

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  1. ^ a b Closed access icon Giles, Sam; Friedman, Matt; Brazeau, Martin D. (2015-01-12). "Osteichthyan-like cranial conditions in an Early Devonian stem gnathostome". Nature. 520 (7545): 82–85. Bibcode:2015Natur.520...82G. doi:10.1038/nature14065. ISSN 1476-4687. PMC 5536226. PMID 25581798.
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