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- W1567698185 abstract "We report on the first Carboniferous tetrapod specimen discovered in Northern Ireland, and one of the most primitive tetrapods known from the UK. The specimen consists of a partial left jaw ramus showing sufficient features to diagnose it as a new taxon. The specimen was discovered in 1843 by Portlock, described as Holoptychius and housed with the British Geological Survey. Recent work on tetrapodomorph lower jaws has shown that this specimen belongs to an undoubted tetrapod that bears resemblances to deep-skulled forms such as the whatcheeriids and Crassigyrinus. The precise locality is uncertain, but it probably derives from a site near Maghera, County Londonderry. Palynological evidence is equivocal, ranging from late Tournaisian through early Westphalian. The Altagoan Formation, from which most of Portlock’s material seems to have been collected, is usually regarded as late Tournaisian or early Visean (Courceyan or Chadian). The specimen is almost certainly older than those from Jarrow in Eire (Westphalian A), and is certainly more primitive than any tetrapod described from there. The specimen extends the geographical range of known Early Carboniferous tetrapods, which have now been found much further west in the British Isles than previously reported, and suggests the possibility of further discoveries in this region. The jaw displays a distinctive character combination, including coronoids with an organised tooth row, lack of postsplenial-prearticular contact, an open mandibular lateral line sulcus, and a stepped rather than straight dentary-angular suture. A preliminary analysis of lower jaw characters places the new taxon in the neighbourhood of “Tulerpeton” (late Famennian jaw material from Andreyevka, Russia) and Whatcheeria, above all other Devonian tetrapods, and below Crassigyrinus, Greererpeton, Megalocephalus and an anthracosaur-temnospondyl clade. It may belong to an early and wide-ranging post-Devonian tetrapod radiation." @default.
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- W1567698185 date "2002-01-01" @default.
- W1567698185 modified "2023-09-27" @default.
- W1567698185 title "A new stem tetrapod from the Early Carboniferous of Northern Ireland" @default.
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