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.

Callochiton monteleonensis n. sp., first record of Polyplacophora (Mollusca) from the Neogene of Argentina

2011 ◽  
Vol 85 (6) ◽  
pp. 1181-1187 ◽  
Author(s):  
Diego Urteaga ◽  
Miguel Griffin ◽  
Guido Pastorino
Keyword(s):  
New Species ◽  
New Zealand ◽  
Central Area ◽  
First Record ◽  
Early Miocene ◽  
Southwestern Atlantic ◽  
Santa Cruz ◽  
Recent Species ◽  
A New Species

A new species of chiton is described from early Miocene deposits of the Monte León Formation, in Santa Cruz Province, Argentina. Callochiton monteleonensis n. sp. clearly differs from known fossil and Recent species of the southwestern Atlantic because the central area of its intermediate valves has a stepped appearance, in which each step is marked by a longitudinal rib. It is similar to Callochiton kapitiensis Mestayer, 1926, a Recent species from New Zealand. Biogeographic implications are discussed. This is the first record of a polyplacophoran from Neogene deposits of Argentina.

The southernmost fossil record of Squamates

2017 ◽  
Vol 38 (1) ◽  
pp. 15-30 ◽  
Author(s):  
Adriana Albino ◽  
Santiago Brizuela ◽  
Sergio Vizcaíno
Keyword(s):  
South America ◽  
Fossil Record ◽  
Early Miocene ◽  
Substantial Part ◽  
South American ◽  
Santa Cruz ◽  
Origin And Evolution ◽  
Present Distribution ◽  
First Time

Squamates form a substantial part of the present-day South American herpetofauna, and their fossils constitute an indispensable evidence for understanding the origin and evolution of the main taxa. Squamates are relatively common in Miocene localities of Patagonia, especially in levels of the late early Miocene Santa Cruz Formation. In this contribution, remains of the three species of the extinct iguanidErichosaurusAmeghino 1899 (E. diminutus,E. bombimaxillaandE. debilis) are redescribed, and new squamate specimens are reported for first time. The genusErichosaurusis considered invalid.Erichosaurus debilis,E. diminutusand a new specimen are recognized as indeterminate species of the extant polichrotinePristidactylus, whereasE. bombimaxillaremains as an indeterminate iguanid. Snakes are represented by an indeterminate colubrid. All these specimens, together with a tupinambine teiid previously described for the same formation, represent the southernmost fossil record of squamates in South America and indicate the occurrence of the iguanidPristidactylus, the teiidTupinambisand the colubrid snakes south to their present distribution as back as during the early Miocene.

First record of Nematherium (Xenarthra, Mylodontidae) from the Pinturas Formation (Burdigalian, early Miocene), Santa Cruz Province, Argentina

2019 ◽  
Vol 96 ◽  
pp. 102324
Author(s):  
Diego Brandoni ◽  
Nelson M. Novo ◽  
Juliana Tarquini ◽  
Marcelo F. Tejedor
Keyword(s):  
First Record ◽  
Early Miocene ◽  
Santa Cruz

A new monotypic genus and new species of lady beetle (Coleoptera: Coccinellidae: Coccinellini) from western South America

Zootaxa ◽  
2019 ◽  
Vol 4712 (3) ◽  
pp. 413-422
Author(s):  
NATALIA J. VANDENBERG
Keyword(s):  
New Species ◽  
South America ◽  
New Taxa ◽  
Lady Beetle ◽  
New Taxon ◽  
Monotypic Genus ◽  
Anatomical Characters

A new monotypic genus Argosadalia gen. nov. and new species A. priscilla sp. nov. are described from the forests of Bolivia, Ecuador, and Peru. The new taxon is placed in the tribe Coccinellini in a group informally designated as the “Neda-group,” and comprising the genera Neda Mulsant; Mononeda Crotch; Neoharmonia Crotch and Argosadalia. Key morphological and anatomical characters of the new taxa are described and illustrated and the character states that define the Neda-group are reviewed. 

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.

scholarly journals An enigmatic aquatic snake from the Cenomanian of Northern South America

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2027 ◽  
Author(s):  
Adriana Albino ◽  
Jorge D. Carrillo-Briceño ◽  
James M. Neenan
Keyword(s):  
South America ◽  
Vertebral Column ◽  
First Record ◽  
New Taxon ◽  
Fossil Material ◽  
Mode Of Life ◽  
Aquatic Mode ◽  
Systematic Relationships ◽  
Northern South America ◽  
La Luna

We report the first record of a snake from the Cretaceous of northern South America. The remains come from the La Luna Formation (La Aguada Member, Cenomanian of Venezuela) and consist of several vertebrae, which belong to the precloacal region of the vertebral column. Comparisons to extant and extinct snakes show that the remains represent a new taxon,Lunaophis aquaticusgen. et sp nov. An aquatic mode of life is supported by the ventral position of the ribs, indicating a laterally compressed body. The systematic relationships of this new taxon are difficult to determine due to the scarcity of fossil material; it is, however, a representative of an early lineage of snakes that exploited tropical marine pelagic environments, as reflected by the depositional conditions of the La Aguada Member.Lunaophisis also the first aquatic snake from the Cenomanian found outside of the African and European Tethyan and Boreal Zones.

scholarly journals The Biggest Megaraptoridae (Theropoda: Coelurosauria) of South America

2021 ◽  
Author(s):  
Alexis M. Aranciaga Rolando ◽  
Matias J. Motta ◽  
Federico L. Agnolín ◽  
Makoto Manabe ◽  
Takanobu Tsuihiji ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
South America ◽  
Early Cretaceous ◽  
South American ◽  
New Taxon ◽  
Santa Cruz ◽  
Monophyletic Clade ◽  
Present Contribution ◽  
Anatomical Features ◽  
Top Predators

Abstract Megaraptorans are a theropod clade distributed in former Gondwana landmasses and Asia. Most members of the clade are known from early Cretaceous to Turonian times whereas Maastrichtian megaraptorans are known just from isolated and poorly informative remains. The aim of present contribution is to describe a partial skeleton of a megaraptorid coming from Maastrichtian beds at Santa Cruz province, Argentina. This new taxon constitutes the most informative megaraptoran from post-Turonian beds. Phylogenetic analysis nested the new taxon together with South American megaraptorans in a monophyletic clade, whereas Australian and Asian members constitute successive stem groups. South American forms differ from more basal megaraptorans in several anatomical features and in being much larger and more robustly built. It is possible that the Cenomanian-Turonian extinction of carcharodontosaurids was allowed to megaraptorans to occupy the niche of top predators in South America.

Phylogeny and taxonomy of the Patagonian Miocene falcon Thegornis musculosus Ameghino, 1895 (Aves: Falconidae)

2011 ◽  
Vol 85 (6) ◽  
pp. 1089-1104 ◽  
Author(s):  
Jorge I. Noriega ◽  
Juan I. Areta ◽  
Sergio F. Vizcaíno ◽  
M. Susana Bargo
Keyword(s):  
South America ◽  
Plant Communities ◽  
Fossil Record ◽  
Early Miocene ◽  
Santa Cruz ◽  
Postcranial Morphology ◽  
Phylogenetic Placement ◽  
The Family ◽  
Basal Clade ◽  
Early Neogene

The fossil record of the family Falconidae is poor and fragmentary. Extinct representatives from South America include the late early Miocene (Santacrucian) Thegornis musculosus and Thegornis debilis. Both species were originally described as Falconidae and afterwards moved to Accipitridae Circinae or Buteoninae. The analysis of a very well preserved and complete specimen of T. musculosus with similar stratigraphic and geographic provenances of the type material (lower levels of Santa Cruz Formation, coast of Patagonia, Argentina) corroborates the validity of the genus and its falconid affinities. The skull and postcranial morphology exhibit strong resemblances with the open-savannah inhabiting Herpetotheres and the forest-dwelling Micrastur (Herpetotherinae) but differ substantially from Falconinae (Falconini plus Caracarini). Detailed comparisons with a broad arrange of falconiform taxa in a cladistic framework, confirm its phylogenetic placement within the Herpetotherinae and sister to H. cachinnans. The ecotonal margins produced by the vanishing of humid forests that developed during changes in Patagonian plant communities throughout early Neogene times are hypothesized as a plausible scenario to understand the evolution of this basal clade of falcons.

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.

Rubiacearum Americanarum Magna Hama Pars XLVI: New Species and Taxonomic Changes in Faramea of Central and South America (Rubiaceae, Coussareeae)

2020 ◽  
Vol 28 (2) ◽  
pp. 108-142
Author(s):  
Charlotte M. Taylor ◽  
Jomar G. Jardim
Keyword(s):  
New Species ◽  
South America ◽  
Central America ◽  
New Taxa ◽  
New Subspecies ◽  
Taxonomic Changes ◽  
New Nomenclatural Combinations

Review of specimens and names of Faramea Aubl. (Rubiaceae, Coussareeae) has required new nomenclatural combinations, clarified the identities of some previously described species, and discovered some new taxa. Here we transfer two Faramea names, F. suaveolens Duchass. and F. panurensis Müll. Arg., to Coussarea Aubl.; review the identities of F. cuencana Standl., F. multiflora A. Rich., F. oblongifolia Standl., F. parvibractea Steyerm., F. spathacea Müll. Arg. ex Standl., and F. suerrensis (Donn. Sm.) Donn. Sm.; lectotypify F. multiflora and F. panurensis; transfer to Faramea and lectotypify Rudgea scandens K. Krause; and describe 13 new species and two new subspecies: F. camposiana C. M. Taylor of Ecuador and Peru, F. foreroana C. M. Taylor of Colombia, F. fosteri C. M. Taylor of western South America, F. galerasana C. M. Taylor of Ecuador, F. grayumiana C. M. Taylor of Central America, F. kampauicola C. M. Taylor of Ecuador and Peru, F. neilliana C. M. Taylor of western South America, F. premontana C. M. Taylor of Ecuador, F. quijosana C. M. Taylor of Ecuador, F. ramosiana C. M. Taylor of Colombia, F. reyneliana C. M. Taylor of Peru, F. stoneana C. M. Taylor with two subspecies from Central and western South America, F. suerrensis subsp. miryamiae C. M. Taylor from Colombia, and F. vernicosa C. M. Taylor of Ecuador and Peru.

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