scholarly journals A Late Cretaceous dinosaur and crocodyliform faunal association–based on isolate teeth and osteoderms–at Cerro Fortaleza Formation (Campanian-Maastrichtian) type locality, Santa Cruz, Argentina

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0256233
Author(s):  
Ariana Paulina-Carabajal ◽  
Francisco T. Barrios ◽  
Ariel H. Méndez ◽  
Ignacio A. Cerda ◽  
Yuong-Nam Lee
Keyword(s):  
South America ◽  
Late Cretaceous ◽  
First Record ◽  
Taxonomic Composition ◽  
Type Locality ◽  
Santa Cruz ◽  
Southern South America ◽  
Stratigraphic Unit ◽  
Southern Patagonia ◽  
A Site

The Late Cretaceous dinosaur record in southern South America has been improved recently; particularly with findings from Chorrillo and Cerro Fortaleza formations, both bearing ankylosaur remains, a clade that was not previously recorded in the Austral Basin. The dinosaur fauna of the type locality of Cerro Fortaleza Formation is known from -and biased to- large-sized sauropod remains and a single described taxon, the titanosaur Dreadnoughtus schrani. Here, we report the taxonomic composition of a site preserving thirteen isolated teeth and several osteoderms belonging to three dinosaur clades (Abelisauridae, Titanosauria, and Nodosauridae), and at least one clade of notosuchian crocodyliforms (Peirosauridae). They come from sediments positioned at the mid-section of the Cerro Fortaleza Formation, which is Campanian-Maastrichtian in age, adding valuable information to the abundance and biodiversity of this Cretaceous ecosystem. Since non-titanosaur dinosaur bones are almost absent in the locality, the teeth presented here provide a window onto the archosaur biodiversity of the Late Cretaceous in southern Patagonia. The nodosaurid tooth and small armor ossicles represent the first record of ankylosaurs for this stratigraphic unit. The peirosaurid material also represents the most austral record of the clade in South America.

New details of the male terminalia of Diathoneura longipennis (Malloch, 1926) (Diptera, Drosophilidae)

2019 ◽  
Vol 40 (1) ◽  
pp. 45-50
Author(s):  
Carlos R. Vilela ◽  
Gerhard Bächli
Keyword(s):  
Costa Rica ◽  
South America ◽  
Late Stage ◽  
First Record ◽  
Type Locality

The male terminalia of a non-type Diathoneura longipennis (Malloch 1926) specimen,collected in Peru, were dissected and analyzed. The aedeagus and associated sclerites were found tohave been fixed at a late stage of protrusion, resulting in a different morphology, when compared to thetwo previous publications, which were fixed at earlier stages. Consequently, additional details of certainanatomical parts were observed and a better understanding of the aedeagus protruding process was attained.Diathoneura longipennis has been previously identified in San Mateo, Alajuela, Costa Rica (type locality)and Panama, and this specimen represents the first record of this species in South America.

Identity of Carex trichodes Steud. ex Boott and Carex lateriflora Phil. (subgen. Psyllophorae, sect. Junciformes, Cyperaceae) from Southern South America

Phytotaxa ◽  
2022 ◽  
Vol 530 (2) ◽  
pp. 230-236
Author(s):  
DIEGO N. PENNECKAMP
Keyword(s):  
South America ◽  
Type Locality ◽  
Type Material ◽  
Southern South America ◽  
In The Wild ◽  
Made In

The identity of Carex trichodes, a species only known from the collection of the type material made in 1854 is clarified after finding it in the wild in the vicinity of the type locality. It is concluded that C. trichodes was proposed based on stressed plants corresponding to the same taxon later described as C. lateriflora.

A novel late Early Miocene assemblage of terrestrial gastropods from Santa Cruz (Patagonia, Argentina)

2015 ◽  
Vol 89 (5) ◽  
pp. 748-761 ◽  
Author(s):  
Sergio E. Miquel ◽  
Pablo E. Rodriguez
Keyword(s):  
South America ◽  
New Taxa ◽  
Vegetation Cover ◽  
First Record ◽  
Early Miocene ◽  
New Taxon ◽  
Santa Cruz ◽  
Dense Vegetation ◽  
Humid Environment ◽  
New Information

AbstractA remarkable fossil assemblage composed of five gastropod taxa is described from the Early Miocene of Santa Cruz (Patagonia, Argentina) in southernmost South America. The assemblage includes extinct and living genera South America, and on geographic distributions and represent background new information on spatial and across time distributions as well as identification of new taxa. A new taxon,Patagocharopa enigmatican. gen. n. sp., is tentatively assigned to Charopidae.Gastrocopta patagonican. sp. (Vertiginidae) represents the oldest record ofGastrocoptain Argentina and the southernmost record for the Americas.Punctum patagonicumn. sp. (Punctidae) represents the first record ofPunctumfor continental South America, and characterized by a protoconch with traces of axial costulae and a teleoconch with strong radial ribs.Zilchogyra miocenican. sp. is the first Miocene record of the charopid genusZilchogyra. Fragments of a possibleScolodonta(Scolodontidae) are recorded. Overall, the assemblage represents an important and useful paleoenvironmental tool. This fauna suggests that a more temperate and humid environment than today—with a more dense vegetation cover—was prevalent at this site during the Early Miocene.

scholarly journals First record on an amphibian in the canopy of temperate rainforests of southern South America: Eupsophus calcaratus (Cycloramphidae)

2010 ◽  
Vol 31 (2) ◽  
Author(s):  
Iván A Díaz ◽  
Claudio Correa ◽  
Maurice E Peña-Foxon ◽  
Marco A Méndez ◽  
Andrés Charrier
Keyword(s):  
South America ◽  
First Record ◽  
Southern South America ◽  
Temperate Rainforests

Monimiaceae sensu lato, an element of Gondwanan polar forests: Evidence from the late Cretaceous-early tertiary wood flora of Antarctica

2001 ◽  
Vol 14 (2) ◽  
pp. 207 ◽  
Author(s):  
Imogen Poole ◽  
Helmut Gottwald
Keyword(s):  
Late Cretaceous ◽  
Upper Cretaceous ◽  
First Record ◽  
Southern South America ◽  
Anatomical Features ◽  
Early Tertiary ◽  
Breadth Ratio ◽  
Ecological Dominance ◽  
Perforation Plates ◽  
The Antarctic

Palaeofloristic studies of the Antarctic Peninsula region are important in furthering our understanding of (i) the radiation and rise to ecological dominance of the angiosperms in the Southern Hemisphere during the Late Cretaceous and (ii) the present day disjunct austral vegetation. Investigations of Upper Cretaceous and Early Tertiary sediments of this region yield a rich assemblage of well-preserved fossil dicotyledonous angiosperm wood which provides evidence for the existence, since the Late Cretaceous, of temperate forests similar in composition to those found in present-day southern South America, New Zealand and Australia. This paper describes two previously unrecognised morphotypes, which can be assigned to the Monimiaceae sensu lato, and represents the first record of this family in the wood flora of Antarctica. Specimens belonging to the first fossil morphotype have been assigned to Hedycaryoxylon SÜss (subfamily Monimioideae) because they exhibit anatomical features characteristic of Hedycaryoxylon and extant Hedycarya J.R.Forst. &amp; G.Forst. and Tambourissa Sonn. Characters include diffuse porosity, vessels which are mainly solitary with scalariform perforation plates, opposite to scalariform intervascular pitting, paratracheal parenchyma, septate fibres and tall (>3 mm), wide multiseriate rays with a length: breadth ratio of approximately 1: 4. Specimens belonging to the second morphotype have been assigned to Atherospermoxylon KrÄusel, erected for fossil woods of the Monimiaceae in the tribe Atherospermeae (now Atherospermataceae) in that they exhibit anatomical features similar to Atherospermoxylon and extant Daphnandra Benth., Doryphora Endl. and Laurelia novae-zelandiae A.Cunn. These characters include diffuse to semi-ring porosity, scalariform perforation plates with up to 25 bars, septate fibres, relatively short (<1 mm) rays with a length: breadth ratio of between 1: 4 and 1: 11.

Paralonchothrix gen. nov., the first record of Echimyini (Rodentia, Octodontoidea) in the late Miocene of Southern South America

2021 ◽  
pp. 1-12
Author(s):  
Pedro PIÑERO ◽  
A. Itatí OLIVARES ◽  
Diego H. VERZI ◽  
Victor H. CONTRERAS
Keyword(s):  
South America ◽  
Late Miocene ◽  
New Genus ◽  
Sister Group ◽  
First Record ◽  
Northwestern Argentina ◽  
Southern South America ◽  
Evolutionary Pattern ◽  
Minimum Age ◽  
First Time

ABSTRACT Echimyidae is the most widely diversified family among hystricognath rodents, both in the number of species and variety of lifestyles. In the Patagonian Subregion of southern South America, extinct echimyids related to living arboreal species (Echimyini) are recorded up to the middle Miocene, whereas all the known southern fossils since the late Miocene are linked to terrestrial and fossorial lineages currently inhabiting the Chacoan open biome in eastern South America. In this work, we describe a new genus of echimyid rodent, Paralonchothrix gen. nov., from the late Miocene of northwestern Argentina and western Brazil. Its single recognised species, Paralonchothrix ponderosus comb. nov., is represented by two hemimandibles. One of them comes from a level of Loma de Las Tapias Formation, underlying a tuff dated at 7.0 ± 0.9 Ma (Huayquerian age, late Miocene); the other specimen comes from the ‘Araucanense’ of Valle de Santa María (type locality, Huayquerian age, late Miocene). A phylogenetic analysis linked Paralonchothrix to Lonchothrix, both being the sister group to Mesomys. Thereby, for the first time, an echimyid linked to living Amazonian arboreal clades is recognised for the late Miocene of southern South America. Paralonchothrix gen. nov. thus represents an exceptional record that raises the need to review the postulated evolutionary pattern for echimyids recorded at high latitudes since the late Miocene. The new genus provides a minimum age (ca.7 Ma) in the fossil record for the divergence between Mesomys and Lonchothrix. The palaeoenvironmental conditions inferred for the late Miocene in western and northwestern Argentina suggest savanna-type environments, with areas with more closed woodlands in peri-Andean valleys. The record of Paralonchothrix gen. nov. supports the hypothesis that this area would have maintained connections with tropical biomes of northern South America during the late Miocene.

scholarly journals New records, and the first description of a female, for Psychoda simillima (Diptera, Psychodidae) in southern South America

2013 ◽  
Vol 103 (2) ◽  
pp. 134-137 ◽  
Author(s):  
Danilo Cordeiro ◽  
Guillermo Omad ◽  
Freddy Bravo ◽  
Claudio J. B. de Carvalho
Keyword(s):  
South America ◽  
New Records ◽  
First Record ◽  
Southern South America

Based onmale and female, Psychoda simillima Tonnoir, 1929 is redescribed, with a discussion of generic and subgeneric classifications. This is the first record for Chile as well as the first description of a female for this species.

Species composition and geographic distribution of Fuegian Curculionidae (Coleoptera: Curculionoidea)

Zootaxa ◽  
2012 ◽  
Vol 3303 (1) ◽  
pp. 1 ◽  
Author(s):  
PAULA POSADAS
Keyword(s):  
South America ◽  
Species Composition ◽  
Geographic Distribution ◽  
Taxonomic Composition ◽  
Tierra Del Fuego ◽  
Integrative Approach ◽  
Southern South America ◽  
Identification Keys

The objective of this paper is to provide an integrative approach to taxonomic composition and distributional informationon the weevil fauna (Coleoptera: Curculionoidea) of the Tierra del Fuego archipelago. A total of 39 species belonging to17 Curculionidae genera are recorded for the archipelago. Most of these belong to two subfamilies: Entiminae (13 speciesin four genera) and Cyclominae (23 species in 11 genera). Caneorhinus gravidus (Burmeister) is here established as a newjunior synonym of Caneorhinus lineatus (Blanchard). The Fuegian weevil fauna is considered to represent an impover-ished condition in comparison to that from continental southern South America. The Tierra del Fuego archipelago has noendemic genera of Curculionidae and only three species seem to be endemic to it (Antarctobius rugirostris Champion,Cylydrorhinus lateralis [Berg], and Cylydrorhinus fulvipes [Guérin-Méneville]). However, these three species have scarcerecords and more information is required to confirm their status as Fuegian endemics. No species present in Tierra delFuego extend their distribution beyond the Andean subregion. The Fuegian weevil fauna exhibits a great linkages to thatfrom continental southernmost South America. Synonymic lists and distributional maps are provided for each speciesknown to occur on the islands. Identification keys and photographs of weevil taxa recorded for Tierra del Fuego are also presented.

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