Brachythyrididae Fredericks, 1924

Carniti, Alessandro P., Porta, Giovanna Della, Banks, Vanessa J., Stephenson, Michael H. & Angiolini, Lucia, 2022, Brachiopod fauna from uppermost Visean (Mississippian) mud mounds in Derbyshire, UK, Acta Palaeontologica Polonica 67 (4), pp. 865-915 : 904

Family Brachythyrididae Fredericks, 1924 Genus Latibrachythyris Angiolini, Long, and Davies, 2011

Type species: Spirifer pinguis Sowerby, 1821 a , from the Tournaisian– Visean of Ireland and England .

Remarks.— Latibrachythyris is distinguishable from Skelidorygma Carter, 1974 , of the Skelidorygmidae Carter, 1994 , as it lacks a primary median rib in the sulcus and has a denticulate interarea. Spirifer crassus (De Koninck, 1843) , from the Visean of Ireland, has wide, straight cardinal margin and an ornamentation of 50–70 low, flat ribs, unequal in width and irregularly bifurcating, with no sulcal median rib, as visible from the figures by Davidson (1858: pl. 6: 20–22). It is thus assigned to Latibrachythyris . Brachythyris hortonensi Carter, 1988 , from the Mississippian of USA, was assigned to Latibrachythyris by Bahrammanesh et al. (2011), but as the species is characterised by a sulcal median rib, it is better included in Skelidorygma . Spirifer integricostus Phillips, 1836 , was considered as a Skelidorygma species by Brunton (1984) and Brunton and Tilsley (1991). However, the figured specimens of S. integricostus from the Visean of Yorkshire (Davidson 1859: pl. 9: 18; Brunton 1984: fig. 129) and the upper Visean of County Fermanagh, Ireland ( Brunton 1984: fig. 128) show a wide cardinal margin, wider than two-thirds maximum width, and no sulcal median rib. Legrand-Blain (1986) noted that S. integricostus has a weakly denticulate interarea, so it can be assigned to Latibrachythyris .