scholarly journals A new genus of dipnoiformes from the Cretaceous of Brazil

2011 ◽  
Vol 83 (4) ◽  
pp. 1181-1192 ◽  
Author(s):  
Carlos E.V. Toledo ◽  
Eliane P. de Sousa ◽  
Manuel A.A. Medeiros ◽  
Reinaldo J. Bertini
Keyword(s):  
Atlantic Ocean ◽  
Fossil Record ◽  
New Genus ◽  
Northern Africa ◽  
New Taxon ◽  
Equatorial Atlantic ◽  
Stratigraphic Unit ◽  
Equatorial Atlantic Ocean

The Alcântara Formation, an important stratigraphic unit from the early Cenomanian of Brazil, was deposited under transitional (estuarine) conditions, and its fossil record includes fragmentary remains of plants, fishes, crocodylomorphs, pterosaurs and dinosaurs, with a noteworthy diversity of dipnoiformes tooth plates. The dipnoiformes material reported here comprises a new taxon, Equinoxiodus alcantarensis, gen. et sp. nov. Most of the identified morphotypes of continental vertebrates collected in the Alcântara Formation are similar to chronocorrelative faunas from Northern Africa, but this new genus of Dipnoiformes indicates some degree of paleogeographic isolation and endemism. This was probably caused by the widening of the equatorial Atlantic Ocean during the early Cenomanian, which may have selectively affected some species.

scholarly journals Ostracoda (Crustacea) from the Archipelago of São Pedro and São Paulo, Equatorial Atlantic, with emphasis on a new Hemicytheridae genus

2013 ◽  
Vol 103 (3) ◽  
pp. 289-301 ◽  
Author(s):  
João C. Coimbra ◽  
Silvia R. Bottezini ◽  
Cláudia P. Machado
Keyword(s):  
New Species ◽  
New Genus ◽  
Abundant Species ◽  
Oceanic Islands ◽  
New Taxon ◽  
Equatorial Atlantic ◽  
New Genus And Species ◽  
Specific Level ◽  
Recent Sediments ◽  
Systematic Knowledge

The present study is a further contribution to the systematic knowledge of the shallow water marine ostracodes from the Brazilian oceanic islands. A total of 14 species belonging to 10 genera and eight families is herein identified. One new genus and species are described and illustrated: Berguecythere insularis gen. nov., sp. nov. In addition to this new taxon, the abundant species Loxocorniculum tricornatum Krutak, 1971, widely distributed in recent sediments in the Gulf of Mexico, Caribbean, north and northeast of Brazil and the Rocas Atoll, along with the cosmopolitan tropical ostracode Triebelina sertata Triebel, 1948, were also identified at specific level. The remaining 11 species were left at the genus level, and should provide new species. Ecological, zoo- and paleozoogeographical aspects were also briefly discussed.

The middle lower Cambrian (Ovetian)Lunagraulosn. gen. from Spain and the oldest trilobite records

2015 ◽  
Vol 152 (6) ◽  
pp. 1123-1136 ◽  
Author(s):  
ELADIO LIÑÁN ◽  
JOSÉ ANTONIO GÁMEZ VINTANED ◽  
RODOLFO GOZALO
Keyword(s):  
Fossil Record ◽  
Lower Cambrian ◽  
New Genus ◽  
Type Locality ◽  
New Taxon ◽  
Northern Spain ◽  
Central Spain ◽  
Additional Material ◽  
The World ◽  
The Village

AbstractThe type material ofAgraulos antiquusSdzuy, 1961 from the La Herrería Formation, northern Spain, is revised together with additional material and included in the new genusLunagraulos. The stratigraphical range ofLunagraulos antiquus(Sdzuy, 1961) – occurring below that of the trilobite species of the generaLunolenus,MetadoxidesandDolerolenusin the type locality of Los Barrios de Luna in the province of León, northern Spain – and the accompanying ichnofossil assemblage demonstrate an Ovetian age (lower part of Cambrian Stage 3, currently being discussed by the International Subcommission on Cambrian Stratigraphy) for this species. Moreover, the trilobiteLunagraulos tamamensisn. gen. n. sp. is found in the Tamames Sandstone near the village of La Rinconada in the province of Salamanca, central Spain. The biostratigraphical position of this new taxon and its accompanying ichnoassemblage is also analysed and assigned to the lowermost Ovetian Stage. The genusLunagraulosis therefore the oldest agraulid found in the fossil record. The exceptional presence ofLunagraulosin a marine coarse siliciclastic succession – a facies rather typical for the ichnofossilsCruzianaandRusophycus, some of the oldest signs of trilobite activity – suggests that first trilobite representatives may have inhabited high- to middle-energy, marine environments. This hypothesis may also explain both the taxonomic and biostratigraphic heterogeneity of the first trilobite genera appearing across the world, due to preservation problems in this type of facies. Comparison of theLunagraulos biostratigraphy with other coeval Spanish fossil assemblages allows us to propose its intercontinental correlation with the oldest records of currently known trilobites.

Surface water response of the equatorial Atlantic Ocean to orbital forcing

1989 ◽  
Vol 4 (1) ◽  
pp. 19-55 ◽  
Author(s):  
Andrew McIntyre ◽  
William F. Ruddiman ◽  
Karen Karlin ◽  
Alan C. Mix
Keyword(s):  
Surface Water ◽  
Atlantic Ocean ◽  
Orbital Forcing ◽  
Equatorial Atlantic ◽  
Equatorial Atlantic Ocean ◽  
Water Response
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