Chondrichthyans from the Devonian–Early Carboniferous of Belarus

Carboniferous chondrichthyan assemblages from the Surprise Canyon and Watahomigi formations (latest Mississippian–Early Pennsylvanian) of the western Grand Canyon, Northern Arizona

“…sp., within the interval of the Watahomigi Formation indicates that some xenacanth taxa were capable of living in marine conditions. Most of the marine records of Bashkirian chondrichthyans are from Eurasia (Ivanov, 1999(Ivanov, , 2013, while in North America the chondrichthyans are primarily euryhaline (Johnson and Thayer, 2009;Carpenter et al, 2015). The records of "Deltodus" by McKee (1982) from the Guano Cave, Parashant Canyon, and Separation Canyon stongly suggest additional chondrichthyan fossils could be found in the Watahomigi Formation of the western Grand Canyon and could expand the data for the Bashkirian chondrichthyan assemblages.…”

“…Eurasian records of Serpukhovian/Bashkirian euselachians are known primarily from a few isolated teeth. The anachronistid neoselachian Ginteria fungiforma Duffin and Ivanov, 2008 was recorded from the Steshev Formation (early Serpukhovian) of the Moscow District, Russia (Duffin and Ivanov, 2008); the basal Euselachian Gissarodus flabellatus Ivanov, 2013 was recorded from the Khodzhir-Bulak Formation (late Serpukhovian-early Bashkirian) in the Gissar Mountains of south-eastern Uzbekistan (Ivanov, 2013); and Protacrodus sp. was recorded from the Bashkirian borehole studies of the North Urals (Ivanov, 1999).…”

“…Ivanov (1999) reported on the teeth and dermal denticles of Protacrodus, symmoriids, ctenacanths, and other neoselachians from the North Urals, an isolated tooth plate of Lagarodus from the River Shar'yu of the Chernyshev Ridge, and stethacanthid and Denaea-like teeth, and neoselachian dermal denticles from the South Island of the Novaya Zemlya Archipelago. Ivanov (2013) also reported on a Late Serpukhovian-Early Bashkirian marine chondrichthyan assemblage from the Gissar Mountains of Uzbekistan. The taxa described here include the symmoriids Denaea cf.…”

“…It is also known from the late Visean of the Holy Cross Mountains, Poland (Ginter et al, 2015), the Visean-Serpukhovian of Derbyshire, England, Scotland, and the Moscow Syneclise, Russia , and tentatively Denaea cf. D. williamsi from the late Serpukhovian fauna from the Gissar Mountains, Uzbekistan (Ivanov, 2013). Denaea williamsi is known from the type section of the Surprise Canyon Formation (Bat Tower 2) and from the eastern near-shore Blue Mountain localities.…”

“…The taxa described here include the symmoriids Denaea cf. D. williamsi and Stethacanthulus decorus Ivanov, 1999, the euselachian Gissarodus flabellatus, and indeterminate dermal denticles (Ivanov, 2013). In North America, the best known Bashkirian fish assemblage is from the Joggins Formation of Nova Scotia.…”