Fig 5 - uploaded by Alberto Luis Cione
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Geographic distribution of Pseudohypolophus mcnulty (black circles), Hypolophodon sylvestris (star), Hypolophodon dockery (square), Hypolophodon sp. of Chile (triangle), and Hypolophodon patagoniensis sp.nov. of Chubut and Río Negro (arrows).
Source publication
Isolated teeth of a new species of the rare batomorph genus Hypolophodon were found in Paleocene beds of the Lefipán Formation (Maastrichtian-Paleocene) of southern Argentina. The new species H. patagoniensis differs from the type species H. sylvestris in the absence of an occlusal tranverse crest on the crown of unworn teeth and of a broad and rou...
Context in source publication
Context 1
... of Pseudohypolophus and Hypolophodon inhabited shallow waters. However, we do not know if also occupied deeper waters. Other than one doubt- ful report from relatively low latitude areas (CAppeTTA 1987), Hypolophodon appears to have been restricted to middle palaeolatitudes (Fig. 5). It has not been re- ported from neither equatorial nor polar areas. The Patagonian and Chilean material are the sole records of Hypolophodon from the Southern Hemisphere. The southern South American specimens might indicate that the genus would have a bipolar distribution, with one or two northern species and one southern species. ...
Citations
... H. sylvestris has also been recorded from Argentina, from the top of the Jagüel Formation (Maastrichtian) by Bogan and Gallina (2011), but with uncertain stratigraphy. Cione et al. (2013) Description: Specimen C.M/07 is a small, slightly rolled but well-preserved median chevron. The occlusal surface is slightly convex and lacks enameloid. ...
Late Paleocene elasmobranch findings are reported, along with reinterpretations of some previous taxonomic identifications in two main outcrops around Talcahuano area (Biobío region, Chile), and also delimiting the exposed lithostratigraphic units. Reviewed fossils are among 15 genera, comprising the species Paraorthacodus clarkii, Squalus minor, Squalus orpiensis, Centrophorus sp., Squatina prima, Anomotodon novus, Striatolamia striata, Carcharias spp., Sylvestrilamia teretidens, Odontaspis winkleri, Palaeohypotodus speyeri, Palaeohypotodus rutoti, Isurolamna inflata, Premontreia gilberti, Physogaleus secundus, Palaeogaleus vincenti and Hypolophodon sylvestris. The main elasmobranch assemblage, collected from the San Martín outcrop, indicates deposition in a shallow lower shoreface-uppermost offshore marine environment and warm-temperate water. Moreover, this elasmobranch assemblage constrains the age of Pilpilco Formation into the middle-late Thanetian, which implies a latest Thanetian-early Ypresian age for the overlying Curanilahue Formation and a Danian-early Thanetian hiatus with the underlying Quiriquina Formation.
... One of the exposed surfaces (studied here) represents the mid-section of the complete tooth. Histologic comparison follows the criteria of Cappetta (1987), Gallina (2011), andCione et al. (2012). ...
... nov. Later, Cook et al. (2014) Cione et al. (2012), occurring in the upper MaastrichtianePaleocene of Chubut, Argentinean Patagonia (Cione et al., 2012;Bogan and Gallina, 2013). Teeth similar to those of Hypolophodon patagoniensis, were described from presumably Paleocene levels of the Quiriquina Formation (Muñoz-Ramirez et al., 2007). ...
... nov. Later, Cook et al. (2014) Cione et al. (2012), occurring in the upper MaastrichtianePaleocene of Chubut, Argentinean Patagonia (Cione et al., 2012;Bogan and Gallina, 2013). Teeth similar to those of Hypolophodon patagoniensis, were described from presumably Paleocene levels of the Quiriquina Formation (Muñoz-Ramirez et al., 2007). ...
Isolated ray teeth have been frequently recorded in several Maastrichtian units of the Arauco Basin of central Chile. Up to now, the taxonomy of these specimens were broadly discussed, however, their historical taxonomic determinations lack good support. This contribution provides new evidence regarding the taxonomy, paleobiogeography and chronostratigraphic distribution of this material. For the first time, a partially articulated dental pavement is presented here. Histological analysis indicates affinities to Rajiformes, while morphologic features reveal affinities to the genus Myledaphus. The differences justify the erection of a new species, Myledaphus araucanus sp. nov. Myledaphus occurs in central Chile, being documented in three localities, with a widespread distribution along the Arauco Basin, ranging the lower Maastrichtian to the upper Maastrichtian, and having a latitudinal range between 33°21′ to 36°45′S. The presence of this genus in the southeastern Pacific during the Maastrichtian contrasts with the morphologically similar genus Hypolophodon previously documented from the Maastrichtian–Paleocene of the southwestern Atlantic. Such segregation between both oceans of southern South America suggests different biogeographic patterns for the marine fauna, reinforcing previous faunal segregations already observed among marine reptiles.
... Further, Ameghino's works on chondrichthyans have not been reviewed up to date, except comments made by Arratia and Cione (1996). In addition to Ameghino's early records, the Mesozoic chondrichthyans record from Argentina and Chile was recently improved with new contributions Su arez and Otero, 2008;Bogan and Agnolin, 2010; Gonz alez Riga et al. 2010;Bogan and Gallina, 2011;Cione et al., 2013;Otero et al., 2013;Bogan et al., 2016). ...
We describe isolated shark teeth collected from levels of the Calafate Formation at the SE coast of the Argentino Lake, Calafate city, Santa Cruz province, Argentina (Atlantic Ocean), and from the Algarrobo coast at the Valparaíso Region in central Chile (Pacific Ocean). The teeth belong to a new species of the echinorhiniform genus Echinorhinus. Echinorhinus maremagnum n. sp. was a taxon distributed in both the southwestern Atlantic and the southeastern Pacific. This new taxon constitutes the oldest record of echinorhiniforms from South America and one of the few Mesozoic records at a worldwide scale.
... A large array of taxa from fossiliferous levels of the Jag€ uel Formation at Trapal-Co, R ıo Negro Province, Argentina, have been described. These include the batoid Hypolophodon patagoniensis (Bogan and Gallina, 2011;Cione et al., 2013), the sharks Serratolamna serrata, Squalicorax pristodontus, Cretolamna sp., Carcharias sp., and Odontaspis sp., as well as teleosteans of the genus Enchodus (Bogan and Agnolin, 2010). In addition, Gonz alez Riga et al. (2010;see also Pr amparo et al., 2014) described teeth of Serratolamna serrata and Squalicorax pristodontus from the Jag€ uel Formation, but from Mendoza Province, western Argentina (Gonz alez Riga et al., 2010;Pr amparo et al., 2014). ...
... On the other side, in northern Patagonia, chondrichthyans are mainly represented by lamniform and batoid teeth (Bogan and Agnolin, 2010;Gonz alez Riga et al., 2010;Bogan and Gallina, 2011;Cione et al., 2013;P ampraro et al., 2014), which are underrepresented in southern localities. These associations are dominated by taxa typical of temperate and tropical Maastrichtian waters of Brazil, Caribbean, North Africa, and Madagascar (Woodward, 1907;Oliveira and Silva Santos, 1950;Arambourg, 1954;Rebouças and Silva Santos, 1956;Cappetta, 1987;Gottfried et al., 2001;Silva, 2007;Carrillo et al., 2008). ...
We describe isolated shark teeth collected in levels of the Calafate Formation (Maastrichtian, Late Cretaceous) on the southeast coast of Argentino Lake, Calafate City, Santa Cruz Province, Argentina. The teeth belong to the hexanchiform Notidanodon dentatus, a new species of the squaliform Protosqualus, and an indeterminate species of the echinorhiniform genus Echinorhinus. The record of Notidanodon constitutes the first in South America. The report of Notidanodon associated with plesiosaur remains is in accordance with previous records from around the world. Protosqualus argentinensis, nov. sp., which is the first record of the genus in South America, is characterized by having teeth with a apicobasally tall root and serrated cutting edges, among other features. Echinorhinus sp. constitutes one of the oldest records of this genus on the continent and one of the few Mesozoic records worldwide. This shark association is clearly distinct from coeval selachian faunas from northern Patagonia, which exhibit clear Tethyan influences. Instead, it shows some similarities to other high-latitude selachian faunas, including Australia, New Zealand, and Antarctica. It is possible that the Cretaceous selachian assemblages of Patagonia may be separated into two different associations: northern Patagonian faunas are related to more temperate associations of lower paleolatitudes, whereas those of southern Patagonia are closer to other southern localities.http://zoobank.org/urn:lsid:zoobank.org:pub:2436DBE8-62E9-4D9DA4FA-8C0F0DBC8C47Citation for this article: Bogan, S., F. L. Agnolin, and F. E. Novas. 2016. New selachian records from the Upper Cretaceous of southern Patagonia: paleobiogeographical implications and the description of a new taxon. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2016.1105235.
... From Maastrichtian beds of Northwestern Argentina Salta Province, the batoid Pucapristis branisi has been reported from the Yacoraite Formation (Schaeffer, 1963;Powell, 1979). More recently, Bogan and Gallina (2011) recognized the presence of the species Hypolophodon sylvestris for the Late Maastrichtian Jagüel Formation, at Río Negro province, Patagonia (see also , which was later considered as a new species by Cione et al. (2013) on the basis of new and abundant specimens. ...
Isolated teeth representing an indeterminate species of the batoid hypsobatid genus Angolabatis are described. The specimens come from the Late Cretaceous (Campanian-Maastrichtian) deposits of the Allen Formation at northern Patagonia, Río Negro province, Argentina. It constitutes the first record of the family in South America, and the first record of Angolabatis outside Africa, being an important addition to Mesozoic ichthyofaunas of the continent.
... Additionally, very similar teeth are frequent in late Maastrichtian beds of central Chile, probably being a closely related taxon to SGO.PV.6644, which were previously identified as an indeterminate dasyatid (Suárez et al., 2003). In addition, Cione et al. (2012) described a new species, H. patagoniensis, from the ? latest CretaceouseEarly Paleocene of Chubut, Argentina. ...
This paper discusses a well-represented fossil record of cartilaginous fishes (Chondrichthyes) from southern South America. The recovered samples allow the recognition of three assemblages with chronostratigraphic and paleogeographic value: i) typical Maastrichtian sharks and rays with affinities to eastern Pacific fauna, including the taxa Ischyrhiza chilensis, Serratolamna serrata, Centrophoroides sp. associated to Carcharias sp., and Dasyatidae indet.; ii) a scarce reworked assemblage of Paleocene–Early Eocene age including the taxa Otodus obliquus and Megascyliorhinus cooperi; iii) a rich assemblage with reworked taxa of Early to Middle Eocene age, together with autochthonous deposited Middle to Late Eocene taxa with close affinities to paleoichthyofaunas recovered from the North Atlantic, represented by Carcharias ‘hopei’, Odontaspis winkleri, Carcharoides catticus, Macrorhizodus praecursor, Carcharocles auriculatus, Striatolamia sp., Striatolamia macrota, Hexanchus agassizi, Notorhynchus sp., Myliobatis sp., Abdounia sp., Pristiophorus sp., Squatina sp., cf. Rhizoprionodon sp., Ischyodus sp., and one new species, Jaekelotodus bagualensis sp. nov. The studied samples include for the first time taxa with well established chronostratigraphic resolutions as well as taphonomic information that help clarifying the age of the fossil-bearing units. In addition, they provide relevant information about the evolution of the Magallanes (=Austral) Basin from the Upper Cretaceous to the Paleogene, suggesting a probable connection with the Quiriquina Basin of south-central Chile during the latest Cretaceous. Finally, the studied assemblages indicate a latitudinal pattern of distribution that provides valuable data on the environmental evolution and temperature of southern South America during the Paleogene.
... E. gladiolus; Bogan & Agnolin 2010). The specimens assigned to Pseudohypolophus mcnultyi by the latter authors were later reassigned to Hypolophodon patagoniensis (Cione et al. 2012). Cranial and postcranial material of a sea turtle (Euclastes meridionalis de la Fuente & Casadío) was collected at the Cerro Azul locality (de la Fuente et al. 2009) from Danian beds of the Jagüel Formation. ...
Neoselachian (modern shark) teeth and palynomorphs have been recovered from the Late Cretaceous Jagüel Formation in the Province of Mendoza, Argentina. The fossiliferous beds were deposited during the Atlantic transgression that covered northern Patagonia and other parts of South America from the Maastrichtian to the Danian. Teeth of several lamniform sharks are attributed to the anacoracid Squalicorax pristodontus and cf. Serratolamna serrata of indeterminate familial affinity. These taxa became extinct at the end of the Cretaceous and confirm the late Maastrichtian age previously assigned to the Jagüel Formation in this northwestern part of the Neuquén Basin. For the first time, the selachian faunas are described together with algae and dispersed organic matter assemblages (palynofacies), revealing new elements of the neritic biota leading up to the Cretaceous-Paleogene (K-Pg) mass extinction in South America. The palynoflora consists exclusively of the prasinophyte algae Tasmanites, Cymatiosphaera and Pterospermella, indicative of stratified saline waters. Dispersed organic components in the profile (mainly opaque equidimensional phytoclasts and prasinophytes) are consistent with an inner neritic environment, with evidence (a great variety of particle sizes, lath-shaped phytoclasts increasing slightly in number and decreasing number of marine components) of slightly more nearshore conditions towards the upper part of the profile. These marine biotas confirm the presence of an epeiric sea over northern Patagonia, which extended westwards to the volcanic arc on the western flank of the Andean Cordillera in Mendoza.
