A new Xenungulata (Mammalia) from the Paleocene of Patagonia, Argentina

2008 ◽  
Vol 82 (2) ◽  
pp. 329-335 ◽  
Author(s):  
Javier N. Gelfo ◽  
Guillermo M. López ◽  
Mariano Bond
Keyword(s):  
Phylogenetic Analysis ◽  
South America ◽  
Phylogenetic Relationship ◽  
New Taxon ◽  
Parsimonious Tree ◽  
Late Paleocene ◽  
Direct Association ◽  
Mammalian Faunas ◽  
New Form ◽  
Preliminary Phylogenetic Analysis

A new form of Xenungulata Paula Couto, 1952 from red levels of the Peñas Coloradas Formation in a locality near Puerto Visser (45°17'S, 67°01'W), Chubut province, Argentina, is represented by a fragmentary left jaw with the m3 (MPEF-PV 1871). Notoetayoa gargantuai n. gen. and n. sp. is the first ever found in direct association with Carodnia feruglioi Simpson, 1935a which characterizes the incompletely known homonymous zone of the late Paleocene of Patagonia. A preliminary phylogenetic analysis, including representatives of “Condylarthra,” Litopterna, Notoungulata, Pyrotheria, Xenungulata and Astrapotheria, plus the characters that could be scored in the new taxon, was performed using TNT software. A single most parsimonious tree was obtained. Notoetayoa gargantuai has a closer phylogenetic relationship with the Xenungulate Etayoa bacatensis Villarroel, 1987 from the ?middle Paleocene of Colombia than with any other Tertiary ungulate group of South America. Notoetayoa gargantuai fills an important gap in the knowledge of the mammalian faunas from the Paleocene of Patagonia, particularly of the poorly known pre-Itaborian times.

scholarly journals The youngest South American rhynchocephalian, a survivor of the K/Pg extinction

2014 ◽  
Vol 281 (1792) ◽  
pp. 20140811 ◽  
Author(s):  
Sebastián Apesteguía ◽  
Raúl O. Gómez ◽  
Guillermo W. Rougier
Keyword(s):  
Phylogenetic Analysis ◽  
New Species ◽  
New Zealand ◽  
South America ◽  
Late Cretaceous ◽  
South American ◽  
New Taxon ◽  
Northern Patagonia ◽  
Extinction Event ◽  
New Form

Rhynchocephalian lepidosaurs, though once widespread worldwide, are represented today only by the tuatara ( Sphenodon ) of New Zealand. After their apparent early Cretaceous extinction in Laurasia, they survived in southern continents. In South America, they are represented by different lineages of Late Cretaceous eupropalinal forms until their disappearance by the Cretaceous/Palaeogene (K/Pg) boundary. We describe here the only unambiguous Palaeogene rhynchocephalian from South America; this new taxon is a younger species of the otherwise Late Cretaceous genus Kawasphenodon . Phylogenetic analysis confirms the allocation of the genus to the clade Opisthodontia. The new form from the Palaeogene of Central Patagonia is much smaller than Kawasphenodon expectatus from the Late Cretaceous of Northern Patagonia. The new species shows that at least one group of rhynchocephalians not related to the extant Sphenodon survived in South America beyond the K/Pg extinction event. Furthermore, it adds to other trans-K/Pg ectotherm tetrapod taxa, suggesting that the end-Cretaceous extinction affected Patagonia more benignly than the Laurasian landmasses.

An unusual new basal iguanodont (Dinosauria: Ornithopoda) from the Lower Cretaceous of Teruel, Spain

Zootaxa ◽  
2012 ◽  
Vol 3595 (1) ◽  
pp. 61 ◽  
Author(s):  
ANDREW T. MCDONALD ◽  
EDUARDO ESPÍLEZ ◽  
LUIS MAMPEL ◽  
JAMES I. KIRKLAND ◽  
LUIS ALCALÁ
Keyword(s):  
Phylogenetic Analysis ◽  
Lower Cretaceous ◽  
Fossil Record ◽  
New Taxon ◽  
Unique Combination ◽  
Preliminary Phylogenetic Analysis

We describe a new basal iguanodont, Proa valdearinnoensis, from the Lower Cretaceous (lower Albian) EscuchaFormation of Teruel Province, Spain. The new taxon is known from abundant cranial and postcranial material belongingto several individuals, and is distinguished by an autapomorphy (predentary comes to a point at its rostral margin, withdivergent lateral processes) and a unique combination of characters. Proa fills part of an otherwise lengthy temporal gap(early Aptian–Santonian) in the European fossil record of basal iguanodonts. A preliminary phylogenetic analysis placesProa in a polytomy with Iguanodon bernissartensis and more derived iguanodontians (Hadrosauroidea). Proa is morebasal than the Valanginian Hypselospinus and late Barremian-early Aptian Mantellisaurus, suggesting a long ghost lineage leading to Proa.

Phylogenetic placement of Ectemnia, an autapomorphic black fly (Diptera: Simuliidae), using behavioural characters

1998 ◽  
Vol 76 (10) ◽  
pp. 1942-1948 ◽  
Author(s):  
A E Stuart ◽  
F F Hunter
Keyword(s):  
Phylogenetic Analysis ◽  
Phylogenetic Relationship ◽  
Sister Group ◽  
Structural Features ◽  
Black Fly ◽  
Parsimonious Tree ◽  
Phylogenetic Placement ◽  
Spinning Behaviour

The black fly genus Ectemnia Enderlein possesses a number of autapomorphic (unique derived structural) features in the larval and adult stages that have made resolution of its phylogenetic relationship within the Simuliidae difficult to establish. We studied cocoon-spinning behaviour in Ectemnia invenusta and discovered synapotypies (shared derived behavioural characters) with other black fly taxa. A behavioural phylogenetic analysis performed on representatives of six black fly genera produced a single most parsimonious tree that places Ectemnia as the sister group of a Simulium + Eusimulium clade.

A new species of manakin (Aves: Pipridae; Machaeropterus) from Peru with a taxonomic reassessment of the Striped Manakin (M. regulus) complex 

Zootaxa ◽  
2017 ◽  
Vol 4320 (2) ◽  
pp. 379 ◽  
Author(s):  
DANIEL F. LANE ◽  
ANDREW W. KRATTER ◽  
JOHN P. O’NEILL
Keyword(s):  
New Species ◽  
South America ◽  
Atlantic Forest ◽  
Morphological Characters ◽  
Biological Species ◽  
New Taxon ◽  
Colombian Andes ◽  
New Form ◽  
San Martín ◽  
A New Species

We describe a new taxon of manakin in the Machaeropterus regulus complex, from the foothills of southwestern Loreto and northern San Martín departments, Peru. This new form appears to be almost identical morphologically to the Tepui form M. regulus aureopectus but differs strongly from that and all other members of the M. regulus complex in voice. Therefore, we conclude that this population represents a new biological species that we here name Machaeropterus eckelberryi. Based on voice and some morphological characters, we concur with several previous authors (e.g., Whittaker & Oren 1999; Snow 2004; Ridgely & Tudor 2009) that nominate M. regulus (Eastern Striped Manakin), of the Atlantic Forest of Brazil, should be separated as a biological species from the polytypic Machaeropterus striolatus of western South America (Western Striped Manakin), including M. s. striolatus of Amazonia, M. r. obscurostriatus and M. r. zulianus of the Venezuelan Andes, M. r. antioquiae of the Colombian Andes, and M. r. aureopectus of the tepuis region. 

scholarly journals A new genus of Oniscidea from South America and a phylogenetic analysis of related genera (Crustacea: Isopoda: Philosciidae)

2000 ◽  
Vol 69 (3) ◽  
pp. 179-196 ◽  
Author(s):  
Andreas Leistikow
Keyword(s):  
Phylogenetic Analysis ◽  
New Species ◽  
South America ◽  
New Genus ◽  
Distinct Species ◽  
Morphological Characters ◽  
Type Material ◽  
New Taxon ◽  
Terrestrial Isopods ◽  
Close Relationship

In a collection of terrestrial isopods from Venezuela, a distinct species was identified which does not fit any of the known genera. Therefore, a new taxon Metaprosekia gen.n. is instituted to accomodate the new species. An analysis of its morphological characters revealed a close relationship to the genus Prosekia Vandel, 1968 and allied genera. The phylogeny of this group is discussed and one of its poorly known representatives, Xiphoniscus mirabilis Vandel, 1968 is redescribed on the basis of the type material.

Phylogenetic systematics of Tertiary monophorasterid sand dollars (Clypeasteroida: Echinoidea) from South America

2000 ◽  
Vol 74 (2) ◽  
pp. 263-281 ◽  
Author(s):  
Rich Mooi ◽  
Sergio Martínez ◽  
Sara G. Parma
Keyword(s):  
Phylogenetic Analysis ◽  
New Species ◽  
South America ◽  
Phylogenetic Systematics ◽  
South American ◽  
The South ◽  
Parsimonious Tree ◽  
The Family ◽  
Sand Dollars ◽  
A New Species

Sand dollars in the Monophorasteridae Lahille, 1896, form an important part of the South American Cenozoic echinoid fauna. Re-examination of type and other material adds significantly to our knowledge of the morphology and taxonomy of the family, and shows that besides Monophoraster darwini (Desor, 1847), M. duboisi (Cotteau, 1884), Amplaster coloniensis Martínez, 1984, and A. alatus Rossi de Garcia and Levy, 1989, there is a new species, A. ellipticus. We also show that Karlaster Marchesini Santos, 1958, is not a monophorasterid as once thought. A phylogenetic analysis of 24 characters assessed from all species of Monophoraster Lambert and Thiéry, 1921, and Amplaster Martínez, 1984, along with genera of the Mellitidae Stefanini, 1912, produced a single most parsimonious tree. The analysis demonstrates monophyly of mellitids and monophorasterids, and that Iheringiella Berg, 1898, should be excluded from the latter. Although both Monophoraster Lambert and Thiéry, 1921, and Amplaster Martínez, 1984, retain many features of an ancestor in common with the Mellitidae Stefanini, 1912, they also exhibit bizarre morphologies quite different from those of mellitids. The study has also resulted in a clearer picture of the biogeography and biostratigraphy of the Monophorasteridae, and their great significance in the evolution of lunulate sand dollars in the Americas.

A new species of Polietina (Diptera: Muscidae) from South America, with an updated phylogeny of the genus and a review of species’ identity in GenBank

Zootaxa ◽  
2018 ◽  
Vol 4407 (3) ◽  
pp. 415
Author(s):  
CLAUDIO J. B. DE CARVALHO ◽  
KIRSTERN LICA F. HASEYAMA
Keyword(s):  
New Species ◽  
South America ◽  
Nucleotide Sequences ◽  
Junior Synonym ◽  
New Taxon ◽  
Phylogenetic Hypothesis ◽  
Species Identity ◽  
Parsimonious Tree ◽  
Madre De Dios ◽  
A New Species

After a 20 years hiatus, we describe a new species, Polietina ponti sp. nov., from Madre de Dios, Tambopata River, Peru. Additionally, we propose Polietina nigra Couri & Carvalho, 1996 as a junior synonym of Polietina prima (Couri & Medeiros, 1990). A previous phylogenetic hypothesis was updated with the inclusion of the new taxon described here, which yielded a single most parsimonious tree that is similar to a previously published hypothesis (Pyrellina marsya (Pyrellina distincta (Deltotus facetus ((Polietina steini (Polietina ponti sp. nov., P. prima (P. bicolor, P. minor, P. univittata)(P. flavithorax, P. major)))(P. flavidicincta (P. rubella (P. concinna (P. orbitalis, P. wulpi)))))))). The identity of Polietina vouchers with nucleotide sequences registered in the GenBank were also verified and corrected. 

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.

scholarly journals Pleistocene Mammals from Pampean Region (Argentina). Biostratigraphic, Biogeographic, and Environmental Implications

Quaternary ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 15
Author(s):  
José Luis Prado ◽  
María Teresa Alberdi ◽  
Jonathan Bellinzoni
Keyword(s):  
South America ◽  
The State ◽  
Historical Study ◽  
South American ◽  
Environmental Implications ◽  
Sedimentary Sequences ◽  
Pampean Region ◽  
Mammalian Faunas ◽  
Pleistocene Mammals ◽  
Fossil Records

The Pampean Region contains sedimentary sequences with abundant mammal fossil records, which constitute the chronological outline of the Plio–Pleistocene of South America. These classic localities have been used for more than a century to correlate with other South American regions. Throughout this time, a series of misinterpretations have appeared. To understand the stratigraphic significance of these localities and the geochronological situation of each unit referring to the Pleistocene, a critical historical study of the antecedents was carried out, evaluating the state of each unit. The biostratigraphic studies of the Pampean Region’s mammalian faunas improved the understanding of biogeographic changes taking into account the environmental fluctuations of the Pleistocene.

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