Topic
Physogaleus
About: Physogaleus is a research topic. Over the lifetime, 6 publications have been published within this topic receiving 76 citations.
Papers
TL;DR: A bathymetric analysis of the fossil assemblage based on the distribution of closely-related extant chondrichthyan relatives of fossil taxa and discuss the ecological role and stratigraphic significance of the latter as mentioned in this paper.
Abstract: The Cantaure Formation (Burdigalian to ?early Langhian) is located in the Falcon Basin, North Western Venezuela, and includes one of the most diverse Neogene teleostean and benthonic invertebrate faunas in Tropical America. The paleoenvironmental preferences of the members of this fauna, as well as published paleogeographic reconstructions, suggest that the Cantaure Formation was deposited in a highly-productive shallow water environment, associated with coastal upwelling. We documented a paleodiversity of 39 shark and ray species, including 15 previously unreported taxa for Venezuela and six for Tropical America. We performed a bathymetric analysis of the fossil assemblage based on the distribution of closely-related extant chondrichthyan relatives of fossil taxa and discuss the ecological role and stratigraphic significance of the latter. Our results support the hypothesis that the Cantaure Formation was deposited in an insular inner-middle shelf environment. The elasmobranch fauna is characterized by a predominance of benthopelagic sharks with piscivorous feeding preferences (e.g., †Paratodus, Galeorhinus, Hemipristis, Rhizoprionodon, Carcharhinus, Isogomphodon, Negaprion, †Physogaleus and Sphyrna) followed by durophagous/cancritrophic feeders (e.g., Heterodontus, Nebrius, Mustelus, Rhynchobatus, Pristis, Dasyatis, cf. Pteroplatytrygon, cf. Taeniurops, Aetobatus, Aetomylaeus and Rhinoptera). Filter (e.g., Mobula and †Plinthicus), eurytrophic/sarcophagous (e.g., †Carcharocles and Galeocerdo) and teuthitrophic (e.g., Alopias) feeder species were also found. Teeth of Carcharocles megalodon found in Burdigalian sediments of the Cantaure Formation support the presence of this species already in the early Miocene. Some taxa (Nebrius, Carcharhinus cf. C. macloti and Rhynchobatus) are absent from the extant Caribbean and Western Atlantic fauna, but were present in the region before the closure of the Central American Seaway.
46 citations
Journal Article•
TL;DR: Based on well preserved isolated teeth, nine genera and twelve species of Eocene selachians (sharks and rays) are recorded and described from the Kapurdi Formation (Fuller's Earth) exposed in an open cast mine situated 3 km northeast of the Barakha village in the Barmer District, Rajasthan.
Abstract: Based on well preserved isolated teeth, nine genera and twelve species of Eocene selachians (sharks and rays) are recorded and described from the Kapurdi Formation (Fuller's Earth) exposed in an open cast mine situated 3 km northeast of the Barakha village in the Barmer District, Rajasthan. The assemblage includes Notorhynchus sp.; Galeorhinus sp. 1; Galeorhinus sp. 2; Galeocerdo sp.; Physogaleus sp.; Sphyrna sp; Rhinobatos sp. 1; Rhinobatos sp. 2; Dasyatis sp.; Dasyatoidea indet.; Heterotorpedo sp, and Myliobatis sp. Of these, Notorhynchus, Physogaleus , and Heterolorpedo are being reported for the first time from the Indian subcontinent. The associated fish remains are represented by Teleostei including ?Osteoglossidae gen. et sp. indet., Enchodus sp., Sphyraena sp, and Diodon sp., but these will be described elsewhere after additional collections. No reptilian and mammalian remains have so far been found in the fishyielding Kapurdi beds. The Kapurdi ichthyofauna has similarities with the Upper Palaeocene-Lower Eocene fish assemblages known from the Kakara and Subathu Formations in the Himalayan foothills. It is indicative of deposition in a lagoonal Near-Shore environment and is consistent with the Lower Eocene age interpreted mainly on the basis of the foraminifera1 assemblage.
17 citations
TL;DR: This article described a new shark fauna from Canada's westernmost Arctic island, Banks Island, Northwest Territories, based upon thousands of shark teeth recovered from lower-middle Eocene sediments of the Cyclic Member (Eureka Sound Formation) on northern Banks Island (∼74°N latitude).
Abstract: We describe a new shark fauna from Canada's westernmost Arctic island, Banks Island, Northwest Territories, based upon thousands of shark teeth recovered from lower–middle Eocene sediments of the Cyclic Member (Eureka Sound Formation) on northern Banks Island, Northwest Territories (∼74°N latitude). Based upon palynology, the sediments preserving the shark teeth are late early to middle Eocene in age and likely span the Early Eocene Climatic Optimum (EECO). The low-diversity faunal assemblage is dominated by the sand tiger sharks Striatolamia and Carcharias, but also includes relatively rare teeth of the carcharhinid Physogaleus (extinct relative of sharpnose and tiger sharks) and very rare teeth of the odontaspidid Odontaspis winkleri. We also report the occurrence of the ray Myliobatis. Based upon analogy with extant Carcharias taurus and Myliobatis, the presence of Carcharias and Myliobatis on northern Banks Island corroborates the relatively warm sea surface temperatures estimated by others fo...
13 citations
1 Jan 2016
TL;DR: An early Oligocene (Rupelian, Kiscellian), partially published shark tooth material, unearthed from the Kiscell Clay (Budapest, Hungary) is shortly reviewed here as mentioned in this paper.
Abstract: An Early Oligocene (Rupelian, Kiscellian), partially published shark tooth material,
unearthed from the Kiscell Clay (Budapest, Hungary) is shortly reviewed here. A few shark taxa
have been published by Wilhelm Weiler in 1933 and 1938, and some of this material was re-dis-
covered in the Hungarian Natural History Museum. Th
e here described shark taxa are
Notorynchus
primigenius
,
Hexanchus agassizi
,
Heptranchias howelli
,
Araloselachus cuspidatus
,
Carcharias
spp.,
Carcharoides catticus
,
Isurolamna gracilis
,
Otodus
(
Carcharocles
)
angustidens
,
Alopias
cf.
exigua
,
Car-
charhinus
sp., and
Physogaleus latus
. Th
e results indicate a relatively diverse shark fauna with mixed
ecological needs. Th
e revised list of the local selachian taxa suggests that a detailed review of all
Kiscell shark material (collected in the last century), placed both in public and private collections,
is needed. With 73 fi
gures, 1 table and 1 appendix.
9 citations
1 Jan 2006
TL;DR: A new carcharhinid shark species, Physogaleus hemmooriensis sp. nov, was described from the Lower Hemmoorian (Behrendorfian, late Burdigalian, early Miocene) of Werder, Lower Saxony, Germany as discussed by the authors.
Abstract: A new carcharhinid shark species, Physogaleus hemmooriensis sp. nov., is described from the Lower Hemmoorian (Behrendorfian, late Burdigalian, early Miocene) of Werder, Lower Saxony, Germany. P. hemmooriensis also occurs in the Edegem and Antwerpen Sands Members of the Berchem Formation, Belgium, and in the Miste Bed, Aalten Member of the Breda Formation, The Netherlands, which have an early to middle Miocene age. In the Western Atlantic region, the taxon is present in the early Miocene Calvert Formation of Delaware, U.S.A, which is largely contemporaneous with the Hemmoorian.
6 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2019 | 1 |
| 2016 | 2 |
| 2014 | 1 |
| 2006 | 2 |