Nuevos condrictios de niveles Bartoniano-priabonianos de Río de Las Minas y Sierra Dorotea, Cuenca de Magallanes, Patagonia Chilena.

Abstract

ABSTRACT. Here we studied new fossil chondrichthyans from two localities, Río de Las Minas, and Sierra Dorotea, both in the Magallanes Region, southernmost Chile. In Río de Las Minas, the upper section of the Priabonian Loreto Formation have yielded material referable to the taxa Megascyliorhinus sp., Pristiophorus sp., Rhinoptera sp., and Callorhinchus sp. In Sierra Dorotea, middle-to-late Eocene levels of the Río Turbio Formation have provided teeth referable to the taxa Striatolamia macrota (Agassiz), Palaeohypotodus rutoti (Winkler), Squalus aff. weltoni Long, Carcharias sp., Paraorthacodus sp., Rhinoptera sp., and indeterminate Myliobatids. These new records show the presence of common chondrichtyan diversity along most of the Magallanes Basin. The new record of Paraorthacodus sp. and P. rutoti, support the extension of their respective biochrons in the Magallanes Basin and likely in the southeastern Pacific.

A synoptic review of the Eocene (Ypresian) cartilaginous fishes (Chondrichthyes: Holocephali, Elasmobranchii) of the Bolca Konservat-Lagerstätte, Italy

“…; Case 1991, 1996; Cicimurri and Ebersole 2015), Danian of Russia ( Edaphodon eolucifer ; Popov and Yarkov 2001); Thanetian of the USA ( Ischyodus dolloi , Callorhinchus alfordi , Edaphodon sp., Elasmodus hunteri ; Cicimurri and Ebersole 2015), Thanetian of Kazakhstan ( Darbasodus ; Averianov 1991), Thanetian of Belgium ( Edaphodon leptognathus (Leriche, 1921), Priabonian of Chile ( Ischyodus sp., Callorhinchus sp. ; Otero et al 2013; Otero and Soto-Acuña 2015), early Late Eocene ( Edaphodon sp. ; Parmley and Cicimurri 2005) and also in the Eocene of Germany ( Edaphodon bucklandi , Elasmodus hunteri ; Casier 1967; Stahl 1999), Ukraine ( Edaphodon bucklandi ; Stahl 1999), Morocco (probably Edaphodon bucklandi ; Case and Herman 1973) and Congo ( Paredaphodon arambourgi ; Dartevelle and Casier 1959).…”

A new elasmobranch assemblage from the early Eocene (Ypresian) Fishburne Formation of Berkeley County, South Carolina, USA

“…), South America(Otero and Soto-Acuña 2015), and Antarctica(Long 1992). In North America, reports include Virginia(Ward and Wiest 1990;Kent 1999a;Müller 1999), North Carolina(Case and Borodin 2000),…”

New carcharhiniform sharks (Chondrichthyes, Elasmobranchii) from the early to middle Eocene of Seymour Island, Antarctic Peninsula

“…Representatives of the Carcharhinidae and Triakidae are the most abundant members of Carcharhiniformes found in Eocene deposits of Asia, Africa, Europe and the U.S.A., whereas Sphyrinidae are the least abundant sharks found. Fossil charcharinids and triakids are predominantly known from the Northern Hemisphere (e.g., Casier, 1946; Arambourg, 1952; Case and Cappetta, 1990; Li, 1995; Noubhani and Cappetta, 1997; Mustafa and Zalmout, 2002; Adnet and Cappetta, 2008; Adnet et al, 2010; Carlson and Cuny, 2014; Case et al, 2015; Cappetta and Case, 2016), with only a few records from the Southern Hemisphere (e.g., Dartevelle and Casier, 1943, 1959; Casier, 1957, 1958; Keyes, 1984; Wallett, 2006; Otero et al, 2012, 2013; Otero and Soto-Acuna, 2015). Most representatives of extant families of Carcharhinidae first appeared in the Eocene (Cappetta, 2012; Maisey, 2012).…”