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- Occidens_(genus) abstract "Occidens is an extinct genus of stem tetrapod that lived during the earliest part of the Carboniferous in what is now Northern Ireland. It is known from a single type species, Occidens portlocki, named in 2004 on the basis of a left lower jaw that British geologist Joseph Ellison Portlock described in 1843. Portlock attributed it to the lobe-finned fish Holoptychius and it was housed in the collections of the British Geological Survey for over a century before being reevaluated in 2004 by vertebrate paleontologists Jenny Clack and Per E. Ahlberg, who reclassified it as a new genus and species of early tetrapod. The genus name Occidens refers to its presence west of better-known early tetrapod assemblages in Great Britain, and the species name honors Portlock. The jaw likely comes from the Altagoan Formation and, based on an analysis of fossilized pollen, dates to the late Tournaisian stage of the Early Carboniferous about 350 million years ago. The occurrence of Occidens in the Tournaisian makes it a critically important taxon because it lies within Romer's gap, a time interval spanning most of the Early Carboniferous in which almost no tetrapod fossils are known. Romer's gap separates the first appearance of tetrapods in the Late Devonian from the group's first evolutionary radiation toward the end of the Early Carboniferous. However, the relationship of Occidens to other early tetrapods both before and after the gap remain uncertain, which means that its context in tetrapod evolution remains unknown. Clack and Ahlberg noted several distinctive features of Occidens, including a straight row of teeth along the coronoid bones on the inner surface of the lower jaw, an open groove for a lateral line sense organ on the jaw's outer surface, and a stepped shape to the connection between the dentary and angular bones. The jaw bone is deep, resembling those of Crassigyrinus and whatcheeriids (which both occur in Romer's gap) in overall appearance. In most phylogenetic trees produced by Clack and Ahlberg's 2004 analysis, Occidens fell near whatcheeriids and the Devonian taxon Tulerpeton, being more derived than all other Devonian taxa and more basal than Crassigyrinus and the post-Romer's Gap taxa Greererpeton and Megalocephalus. A 2008 phylogenetic analysis by paleontologists Marcello Ruta and John Bolt found Occidens to be the closest relative of Sigournea multidentata, a species from the end of the gap found in Iowa, but could not determine where these two taxa fit relative to other Early Carboniferous tetrapods.".
- Occidens_(genus) thumbnail Occidens_portlocki_Portlock_1843.jpg?width=300.
- Occidens_(genus) wikiPageID "42987278".
- Occidens_(genus) wikiPageLength "4280".
- Occidens_(genus) wikiPageOutDegree "33".
- Occidens_(genus) wikiPageRevisionID "679467885".
- Occidens_(genus) wikiPageWikiLink 2004_in_paleontology.
- Occidens_(genus) wikiPageWikiLink Altagoan_Formation.
- Occidens_(genus) wikiPageWikiLink Angular_bone.
- Occidens_(genus) wikiPageWikiLink British_Geological_Survey.
- Occidens_(genus) wikiPageWikiLink Carboniferous.
- Occidens_(genus) wikiPageWikiLink Category:Prehistoric_tetrapods.
- Occidens_(genus) wikiPageWikiLink Coronoid_bones.
- Occidens_(genus) wikiPageWikiLink Coronoid_process_of_the_mandible.
- Occidens_(genus) wikiPageWikiLink Crassigyrinus.
- Occidens_(genus) wikiPageWikiLink Dentary_bone.
- Occidens_(genus) wikiPageWikiLink Devonian.
- Occidens_(genus) wikiPageWikiLink Early_Carboniferous.
- Occidens_(genus) wikiPageWikiLink Genus.
- Occidens_(genus) wikiPageWikiLink Greererpeton.
- Occidens_(genus) wikiPageWikiLink Holoptychius.
- Occidens_(genus) wikiPageWikiLink Jenny_Clack.
- Occidens_(genus) wikiPageWikiLink Joseph_Ellison_Portlock.
- Occidens_(genus) wikiPageWikiLink Late_Devonian.
- Occidens_(genus) wikiPageWikiLink Lateral_line.
- Occidens_(genus) wikiPageWikiLink Lobe-finned_fish.
- Occidens_(genus) wikiPageWikiLink Mandible.
- Occidens_(genus) wikiPageWikiLink Marcello_Ruta.
- Occidens_(genus) wikiPageWikiLink Megalocephalus.
- Occidens_(genus) wikiPageWikiLink Mississippian_(geology).
- Occidens_(genus) wikiPageWikiLink Per_E._Ahlberg.
- Occidens_(genus) wikiPageWikiLink Phylogenetic_tree.
- Occidens_(genus) wikiPageWikiLink Romers_gap.
- Occidens_(genus) wikiPageWikiLink Sarcopterygii.
- Occidens_(genus) wikiPageWikiLink Sigournea.
- Occidens_(genus) wikiPageWikiLink Sigournea_multidentata.
- Occidens_(genus) wikiPageWikiLink Stem_tetrapod.
- Occidens_(genus) wikiPageWikiLink Stem_tetrapoda.
- Occidens_(genus) wikiPageWikiLink Synapomorphy.
- Occidens_(genus) wikiPageWikiLink Tournaisian.
- Occidens_(genus) wikiPageWikiLink Tulerpeton.
- Occidens_(genus) wikiPageWikiLink Type_species.
- Occidens_(genus) wikiPageWikiLink Whatcheeriid.
- Occidens_(genus) wikiPageWikiLink Whatcheeriidae.
- Occidens_(genus) wikiPageWikiLinkText "Occidens (genus)".
- Occidens_(genus) authority "Clack and Ahlberg, 2004".
- Occidens_(genus) displayParents "2".
- Occidens_(genus) fossilRange "Early Carboniferous,".
- Occidens_(genus) hasPhotoCollection Occidens_(genus).
- Occidens_(genus) imageCaption "Portlock's 1843 illustration of the jaw of Occidens portlocki, which he attributed to Holoptychius; inner surface and outer surface".
- Occidens_(genus) taxon "Occidens".
- Occidens_(genus) typeSpecies "Occidens portlocki".
- Occidens_(genus) typeSpeciesAuthority "Clack and Ahlberg, 2004".
- Occidens_(genus) wikiPageUsesTemplate Template:Automatic_taxobox.
- Occidens_(genus) wikiPageUsesTemplate Template:Early_tetrapods.
- Occidens_(genus) wikiPageUsesTemplate Template:Portal.
- Occidens_(genus) wikiPageUsesTemplate Template:Reflist.
- Occidens_(genus) subject Category:Prehistoric_tetrapods.
- Occidens_(genus) comment "Occidens is an extinct genus of stem tetrapod that lived during the earliest part of the Carboniferous in what is now Northern Ireland. It is known from a single type species, Occidens portlocki, named in 2004 on the basis of a left lower jaw that British geologist Joseph Ellison Portlock described in 1843.".
- Occidens_(genus) label "Occidens (genus)".
- Occidens_(genus) sameAs m.010rdkhz.
- Occidens_(genus) sameAs Q18355912.
- Occidens_(genus) sameAs Q18355912.
- Occidens_(genus) wasDerivedFrom Occidens_(genus)?oldid=679467885.
- Occidens_(genus) depiction Occidens_portlocki_Portlock_1843.jpg.
- Occidens_(genus) isPrimaryTopicOf Occidens_(genus).