Aptian–Albian rudist bivalves (Hippuritida) from the Chilean Central Andes: Their palaeoceanographic significance

There are rudists in Brazil! Derived examples of cf. Amphitriscoelus Harris and Hodson, 1922, in the Araripe Basin, north-east Brazil: Implications for dating of the fossil Lagerstätten of the Santana and Crato formations

“…Coalcomana ramosa Boehm, 1898, and Pseudocaprina plumensis Harris and Hodson, 1922, from the Barremian to lower Albian (Imlay, 1944;Gonzalez de Juana, 1968;Masse and Rossi, 1987). The southernmost occurrence appears to be Jerjesia chilensis (d 'Orbigny, 1842), from the Cordillera of Coquimbo of Chile (Gerth, 1928;Masse et al, 2015b) at ~30° south and examples of the Mexican monopleurid Douvillelia skeltoni Alencaster and Pantoja-Alor, 1998 reported by Masse et al (2015a). In Peru, Agriopleura blumenbachi Studer, 1834, (Likely Jerjesia sp.…”

Shajia, a new genus of polyconitid rudist from the Langshan Formation of the Lhasa block, Tibet, and its palaeogeographical implications

“…3E), and 'Polyconitid new taxa 2 and 3'(Skelton et al, 2013), both of the latter additionally showing only a weakly convex LV. Tepeyacia and 'Polyconitid new taxon 4'(Skelton et al, 2013) are characterized by distinctive pleated infoldings of the RV outer shell layer, not observed in the Nyima specimens, while the polyconitid affinity of Douvillelia and Jerjesia is in any case questionable(Skelton, 2013a;Masse et al, 2015) as neither appears to possess the diagnostic LV posterior ectomyophoral cavity.In a recent review of the genus Horiopleura, however,Masse and Fenerci-Masse (2017, p. 54) noted that the outwardly inclined (facing towards the posterior side) and/or concave upward form of the Rpm (as inFig. 3B, C)is 'reported in the group of large, advanced species, e.g.Horiopleura lamberti; [whereas] in the group of small, putative primitive species, the inclination may be inwards (towards the anterior side), but a posterior shoulder is always present, a character that differentiates it from Polyconites'.…”