A middle Eocene basking shark (Lamniformes, Cetorhinidae) from Antarctica.

1998 ◽  
Vol 10 (1) ◽  
pp. 83-88 ◽  
Author(s):  
Alberto L. Cione ◽  
M. A. Reguero
Keyword(s):  
Middle Eocene ◽  
First Record ◽  
Proximal Fragment ◽  
South American ◽  
Antarctic Waters ◽  
La Meseta Formation ◽  
Minimum Age ◽  
Living Species ◽  
Gill Raker ◽  
Basking Shark

A proximal fragment of a gill raker identified as belonging to a shark of the genus Cetorhinus was collected from middle Eocene deposits of the La Meseta Formation in the northern part of Seymour Island, Antarctica. This is the first record of a fossil basking shark from Antarctica and one of the earliest records of the genus. The minimum age of Cetorhinidae is middle Eocene. The only living species of the family Cetorhinidae is a very large plankton feeder, Cetorhinus maximus. Basking sharks are unknown in subantarctic or Antarctic waters but occur on both South American coasts today. The evolution of filter-feeding vertebrates is discussed.

Quaternary colonization or Paleogene persistence?: historical biogeography of skates (Chondrichthyes: Rajidae) in the Antarctic ichthyofauna

Paleobiology ◽  
1994 ◽  
Vol 20 (2) ◽  
pp. 215-228 ◽  
Author(s):  
Douglas J. Long
Keyword(s):  
Western Europe ◽  
Middle Eocene ◽  
Habitat Preferences ◽  
Drake Passage ◽  
The Arctic ◽  
Western Atlantic ◽  
Western Tethys ◽  
Antarctic Waters ◽  
La Meseta Formation ◽  
Dispersal Corridor

Seven endemic species of skates (Chondrichthyes: Rajidae) represent the only family of elasmobranchs currently known to live in Antarctic continental waters. Many previous authors believed skates colonized Antarctic waters from Patagonia during interglacial periods in the Quaternary. However, recent fossil material collected from the middle Eocene La Meseta Formation of Seymour Island, Antarctic Peninsula, indicates that they may have persisted in Antarctic waters since the Paleogene. Additionally, oceanographic barriers present in the Neogene and Quaternary would have prevented dispersal from southern continents to Antarctica. A revised dispersal scenario, based on skate fossils, biology, paleogeography, and present centers of skate diversity, suggests that skates evolved in the western Tethys and North Boreal seas of western Europe in the Late Cretaceous and early Paleogene and emigrated into Antarctica during the early to middle Eocene via a dispersal corridor along the continental margins of the western Atlantic Ocean. Skates probably populated the Pacific Basin by passing from this dispersal corridor through the Arctic Ocean. Vicariant events, such as opening of the Drake Passage, the development of the Circum-Antarctic Current, and formation of deep and wide basins around Antarctica in the late Paleogene, created barriers that isolated some species of skates in Antarctica and prevented movement of other species of skates into Antarctica from northern areas. Skates are the only group of fishes known to have survived the Oligocene cooling of Antarctica that killed or extirpated the Paleogene ichthyofauna; they persisted by a combination of cold-tolerance, generalized diet, and unspecialized bathymetric and habitat preferences.

Tupinambine teiids from the middle Miocene of north-western Patagonia (Argentina)

2008 ◽  
Vol 29 (3) ◽  
pp. 425-431 ◽  
Author(s):  
Santiago Brizuela ◽  
Adriana María Albino
Keyword(s):  
Geographical Distribution ◽  
Middle Miocene ◽  
First Record ◽  
South American ◽  
The South ◽  
North Western

Abstract Remains of teiids assignable to the Tupinambinae (Tupinambis sp. or Crocodilurus sp.) are here described from the middle Miocene Collón Curá Formation at Cañadón del Tordillo, in Neuquén province, Argentina. No tupinambine species presently inhabits the region of the fossil locality. The fossils represent the westernmost distribution of fossil tupinambine teiids in Patagonia, enlarging the known geographical distribution of the teiids through the Miocene in a longitudinal range. Also, they constitute the first record of lizards from the Colloncuran SALMA, partially filling the record of tupinambine teiids for the South American Miocene.

scholarly journals A new terrestrial snail species (Gastropoda: Bulimulidae) from the Región de Antofagasta, northern Chile

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3538
Author(s):  
Juan Francisco Araya ◽  
Abraham S.H. Breure
Keyword(s):  
New Species ◽  
Coastal Area ◽  
First Record ◽  
Coastal Areas ◽  
Snail Species ◽  
South American ◽  
Northern Chile ◽  
Terrestrial Snails ◽  
A New Species ◽  
Coastal Range

A new species of Scutalus Albers, 1850 (Gastropoda: Bulimulidae), Scutalus chango sp. n., is described from a coastal area of northern Chile. Empty shells of this new species were found buried in sand and under boulders and rocks in the foothills of the Chilean Coastal Range at Paposo, Región de Antofagasta. This new species is distinguished from all other Chilean terrestrial snails by its slender shell with a flared and reflected aperture, and by the presence of a columellar fold. This is the first record of Scutalus in Chile, and the southernmost record for this endemic South American bulimulid genus. The presence of this species in Paposo highlights the need for further research and for conservation guidelines in coastal areas of northern Chile, which have comparatively high levels of biodiversity and endemism.

The First Record of the Rust Fungus (Pucciniales) Spores from Middle Eocene Sakhalinian Amber

2021 ◽  
Vol 55 (1) ◽  
pp. 105-110
Author(s):  
Yu. Ya. Tykhonenko ◽  
V. P. Hayova ◽  
M. N. Sukhomlyn ◽  
M. S. Ignatov ◽  
D. V. Vasilenko ◽  
...  
Keyword(s):  
Middle Eocene ◽  
Rust Fungus ◽  
First Record

scholarly journals Priogymnanthus colombianus (Oleaceae), a new species and first record of genus to Colombia

Phytotaxa ◽  
2019 ◽  
Vol 399 (3) ◽  
pp. 195
Author(s):  
JOSÉ LUIS FERNÁNDEZ-ALONSO ◽  
PAULA ANDREA MORALES MORALES
Keyword(s):  
New Species ◽  
First Record ◽  
Dry Forest ◽  
South American ◽  
The South ◽  
A New Species ◽  
Iucn Criteria

Priogymnanthus colombianus, a new species and the first record of the South American genus of Oleaceae for Colombia is described and illustrated also we present a dichotomic key for the known species of genus. The new species differs from the three knowns for Priogymnanthus by: leaves oblong or oblong-elliptic, completely glabrous, petioles 10–17 (19) mm; inflorescences 15–20 (25) mm in length, with glabrous rachis, anthers about 3 mm length; fruits (10) 12–15 mm in diameter. P. colombianus occurs on premontane and dry forest in Colombia between 719 and 1213 m of elevation. Based on general threats to its ecosystems and few records found, we categorize the species as EN (endangered) following IUCN criteria.

scholarly journals Reptilia, Testudines, Kinosternidae, Kinosternon scorpioides scorpioides (Linnaeus, 1766): distribution extension

Check List ◽  
2010 ◽  
Vol 6 (2) ◽  
pp. 314
Author(s):  
Henrique Caldeira Costa ◽  
Flavio De Barros Molina ◽  
Vinícius De Avelar São-Pedro ◽  
Renato Neves Feio
Keyword(s):  
River Basin ◽  
First Record ◽  
The State ◽  
South American ◽  
Mato Grosso ◽  
The Third

Kinosternon scorpioides scorpioides is the only subspecies of K. scorpioides with a South American distribution. We report the third known register of this taxon for the state of Mato Grosso, Brazil, representing the first record from the Aripuanã River basin. This point is at 390 km and 910 km western from the two previously known records of this species in Mato Grosso, reinforcing the importance of inventories of K. s. scorpioides.

First report of Gieysztoria falx Brusa, Damborenea & Noreña, 2003 (Platyhelminthes: Rhabdocoela) in southern Brazil

Zootaxa ◽  
2019 ◽  
Vol 4706 (3) ◽  
pp. 494-496
Author(s):  
JHOE REYES ◽  
DANIELA BINOW ◽  
ROGÉRIO T. VIANNA ◽  
SAMANTHA E. MARTINS
Keyword(s):  
Hot Spots ◽  
First Record ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Free Living ◽  
Similar Shape ◽  
Freshwater Habitats ◽  
Living Species ◽  
South Brazil ◽  
Shape And Size

Within Dalyelliidae Graff, 1905, Gieysztoria Ruebush & Hayes, 1939 is the most widely distributed and speciose genus, members of which live in marine, brackish, or freshwater habitats (Van Steenkiste et al., 2012). Gieysztoria is composed by ~97 free-living species (Tyler et al. 2016), and species identification is mainly made on the male copulatory system, which has an armed penis (stylet) with different configurations of spines (Noreña et al., 2016). The stylet configuration of Gieysztoria species is traditionally split into two groups: Aequales (spines of similar shape and size) and Inaequales (spines of different shape and size) (Luther, 1955). In the neotropics, specimens of Gieysztoria belong to both the Aequales and Inaequales group   and are well represented (Damborenea et al., 2005; Noreña et al., 2003). According to Braccini et al. (2016, 2017), there are 16 species of Gieysztoria in Brazil, mainly distributed in the southern region. South Brazil harbours a mosaic of wetlands that are considered hot spots of biodiversity, including the Taim Ecological Station (ESEC Taim) protected area that was designated as a Ramsar site (Ramsar, 2017). In the present study, Gieysztoria falx Brusa, Damborenea & Noreña, 2003 is registered in the ESEC Taim, located in Rio Grande do Sul. It represents the first record of G. falx in Brazil. Illustrations and comments on stylet configuration are given.

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