Search results for: Helder Gomes Rodrigues

Items from 1 to 18 out of 18 results

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Incipient morphological specializations associated with fossorial life in the skull of ground squirrels (Sciuridae, Rodentia)

Helder Gomes Rodrigues, Mathilde Damette

Journal of Morphology > 284 > 1 > n/a - n/a

Anatomical and biological specializations have been studied extensively in fossorial rodents, especially in subterranean species, such as mole‐rats or pocket‐gophers. Sciurids (i.e., squirrels) are mostly known for their diverse locomotory behaviors, and encompass many arboreal species. They also include less specialized fossorial species, such as ground squirrels that are mainly scratch diggers....

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Developmental origins and homologies of the hyracoid dentition

Helder Gomes Rodrigues, Rodolphe Tabuce, Robert J. Asher, Lionel Hautier

Evolution & Development > 22 > 4 > 323 - 335

Understanding the origins of morphological specializations in mammals is a key goal in evolutionary biology. It can be accomplished by studying dental homology, which is at the core of most evolutionary and developmental studies. Here, we focused on the evolution and development of the specialized dentition of hyraxes for which dental homologies have long been debated, and could have implications...

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Evolving Teeth Within a Stable Masticatory Apparatus in Orkney Mice

Sabrina Renaud, Ronan Ledevin, Louise Souquet, Helder Gomes Rodrigues, more

Evolutionary Biology > 2018 > 45 > 4 > 405-424

Mice from the Orkney archipelago exhibit an important diversity regarding molar shape. While on some islands mice display a usual dental pattern, teeth from other islands display additional cusplets and unusual phenotypes that may constitute case studies for evaluating the potential functional relevance of dental changes. We developed a multifaceted approach combining 2D and 3D geometric morphometrics,...

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Virtual Endocast Morphology of Mesotheriidae (Mammalia, Notoungulata, Typotheria): New Insights and Implications on Notoungulate Encephalization and Brain Evolution

Marcos Fernández-Monescillo, Pierre-Olivier Antoine, François Pujos, Helder Gomes Rodrigues, more

Journal of Mammalian Evolution > 2019 > 26 > 1 > 85-100

We provide morphological, quantitative, and qualitative studies of cranial endocasts of mesotheriid notoungulates solving previous open debate on notoungulate endocasts. For that purpose, we use the most accurate digital reconstructions methods. We confirm that mesotheriids have endocasts similar in shape and gyrification to those of other rodent-like notoungulates (i.e., Hegetotheriidae and Interatheriidae)...

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Convergent Traits in Mammals Associated with Divergent Behaviors: the Case of the Continuous Dental Replacement in Rock-Wallabies and African Mole-Rats

Helder Gomes Rodrigues, Lionel Hautier, Alistair R. Evans

Journal of Mammalian Evolution > 2017 > 24 > 3 > 261-274

The study of convergences in mammals is crucial to understand the evolutionary processes underlying the origin of shared traits. A classic example is the independent evolution in the pygmy rock-wallaby, the silvery mole-rat, and manatees of continuous dental replacement to compensate for high dental wear. The origins of continuous dental replacement in mammals remain unresolved. As the functional...

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Life in Burrows Channelled the Morphological Evolution of the Skull in Rodents: the Case of African Mole-Rats (Bathyergidae, Rodentia)

Helder Gomes Rodrigues, Radim Šumbera, Lionel Hautier

Journal of Mammalian Evolution > 2016 > 23 > 2 > 175-189

African mole-rats are fossorial rodents that consist of five chisel-tooth digging genera (Heterocephalus, Heliophobius, Georychus, Fukomys, and Cryptomys) and one scratch digger (Bathyergus). They are characterized by striking physiological, morphological, and behavioral adaptations intimately related to their subterranean life. The influence of their mode of life in shaping the cranial morphology...

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Fast evolutionary response of house mice to anthropogenic disturbance on a Sub‐Antarctic island

Sabrina Renaud, Helder Gomes Rodrigues, Ronan Ledevin, Benoît Pisanu, more

Biological Journal of the Linnean Society > 114 > 3 > 513 - 526

Invasions and anthropogenic disturbances challenge species with rapid environmental changes. Understanding how organisms respond to these changes is of major concern for the future of biodiversity. The house mouse on a Sub‐Antarctic island (Guillou Island, Kerguelen Archipelago) had to face such challenges twice: first when invading the island two centuries ago; and nowadays when coping with an in‐depth...

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UNDER PRESSURE? DENTAL ADAPTATIONS TO TERMITOPHAGY AND VERMIVORY AMONG MAMMALS

Cyril Charles, Floréal Solé, Helder Gomes Rodrigues, Laurent Viriot

Evolution > 67 > 6 > 1792 - 1804

The extant mammals have evolved highly diversified diets associated with many specialized morphologies. Two rare diets, termitophagy and vermivory, are characterized by unusual morphological and dental adaptations that have evolved independently in several clades. Termitophagy is known to be associated with increases in tooth number, crown simplification, enamel loss, and the appearance of intermolar...

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Early adaptive radiations of Aplodontoidea (Rodentia, Mammalia) on the Holarctic region: systematics, and phylogenetic and paleobiogeographic implications

Monique Vianey-Liaud, Helder Gomes Rodrigues, Laurent Marivaux

PalZ > 2013 > 87 > 1 > 83-120

The Aplodontoidea, now restricted to only one North American species (Aplodontia rufa), have shown a wide Holarctic extension since the Upper Eocene. As their fossil record is poor, their phylogenetic relationships and the origins of their successive radiations remain unclear. We perform here phylogenetic analyses, primarily based on dental evidence (94 dental of 97 characters), restricted to Paleogene...

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Expansion of open landscapes in Northern China during the Oligocene induced by dramatic climate changes: Paleoecological evidence

Helder Gomes Rodrigues, Laurent Marivaux, Monique Vianey-Liaud

Palaeogeography, Palaeoclimatology, Palaeoecology > 2012 > 358-360 > Complete > 62-71

The mammalian faunas of the Mongolian Plateau were affected by an important turnover at the Eocene–Oligocene transition, caused by a global cooling and a local aridification, which could have strongly affected the environment. However, paleoenvironmental indices remain scarce in this area during the Oligocene. The knowledge of the main paleoecological trends of mammals can thus constitute essential...

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The Cricetidae (Rodentia, Mammalia) from the Ulantatal area (Inner Mongolia, China): New data concerning the evolution of Asian cricetids during the Oligocene

Helder Gomes Rodrigues, Laurent Marivaux, Monique Vianey-Liaud

Journal of Asian Earth Sciences > 2012 > 56 > Complete > 160-179

The Oligocene fossil deposits of Ulantatal in Inner Mongolia show an amazing faunal richness, comparable to the highly diversified contemporaneous faunas from the Valley of Lakes in Central Mongolia. To date, only a few taxa have been described. The present study consists of the description of 13 species of cricetid rodents from seven localities ranging in age from the late Early Oligocene to the...

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Evolutionary and developmental dynamics of the dentition in Muroidea and Dipodoidea (Rodentia, Mammalia)

Helder Gomes Rodrigues, Cyril Charles, Laurent Marivaux, Monique Vianey‐Liaud, more

Evolution & Development > 13 > 4 > 361 - 369

SUMMARY When it comes to mouse evo‐devo, the fourth premolar–first molar (P4–M1) dental complex becomes a source of longstanding controversies among paleontologists and biologists. Muroidea possess only molar teeth but with additional mesial cusps on their M1. Developmental studies tend to demonstrate that the formation of such mesial cusps could result from the integration of a P4 germ into...

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L’espèce en paléontologie : de l’utilisation du binôme linnéen chez les rongeurs fossiles (Mammalia, Rodentia)

Monique Vianey-Liaud, Helder Gomes-Rodrigues, Jacques Michaux

Comptes rendus - Palevol > 2011 > 10 > 2-3 > 117-131

Indépendamment des nombreux concepts d’espèces élaborés, biologistes et paléontologues peuvent, pour étudier aussi bien les diversités biologiques présentes et passées que l’évolution des espèces, employer un même concept qui permet d’appréhender la multiplicité des formes offertes par les êtres vivants. Mais le développement présent de leurs disciplines apporte un éclairage réciproque, longtemps...

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Diet of the extinct Lava mouse Malpaisomys insularis from the Canary Islands: insights from dental microwear

Cyril Firmat, Helder Gomes Rodrigues, Rainer Hutterer, Juan Carlos Rando, more

The Science of Nature > 2011 > 98 > 1 > 33-37

Malpaisomys insularis is a mouse-like rodent endemic to the eastern Canary Islands. It became extinct during the fourteenth century. It was a remarkable species living under hyperarid conditions. A dental microwear analysis was performed in order to determine its former diet. The elevated number of fine scratches found in Malpaisomys molars suggests that it consumed a significant part of Poaceae,...

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A new Oligocene Ctenodactylinae (Rodentia: Mammalia) from Ulantatal (nei Mongol): new insight on the phylogenetic origins of the modern Ctenodactylidae

MONIQUE VIANEY‐LIAUD, HELDER GOMES RODRIGUES, LAURENT MARIVAUX

Zoological Journal of the Linnean Society > 160 > 3 > 531 - 550

The four living genera of Ctenodactylidae (Rodentia) are the only survivors of a flourishing Tertiary group. In this paper, we describe a new Oligocene species from Ulantatal (Chinese Mongolia) that highlights the origins of crown ctenodactylids. This species, Helanshaniadeserta gen. et sp. nov., is lophodont and displays semi‐hypsodont teeth, a dental pattern that is somewhat transitional between...

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Mandible morphology, dental microwear, and diet of the extinct giant rats Canariomys (Rodentia: Murinae) of the Canary Islands (Spain)

CYRIL FIRMAT, HELDER GOMES RODRIGUES, SABRINA RENAUD, JULIEN CLAUDE, more

Biological Journal of the Linnean Society > 101 > 1 > 28 - 40

An ecomorphological approach of mandible shape through Fourier analyses combined with a paleodietary analysis of dental microwear patterns is used to reconstruct the diet of the extinct endemic Canariomys bravoi Crusafont, Pairó & Petter, 1964 and Canariomys tamarani López‐Martínez & López‐Jurado, 1987. These two large rodents, respectively, lived on Tenerife and Gran Canaria, the central...

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Phylogeny and systematic revision of Eocene Cricetidae (Rodentia, Mammalia) from Central and East Asia: on the origin of cricetid rodents

Helder Gomes Rodrigues, Laurent Marivaux, Monique Vianey‐Liaud

Journal of Zoological Systematics and Evolutionary Research > 48 > 3 > 259 - 268

The origin of the Cricetidae and the relationships among earliest species from Central and East Asia are still disputed. The taxonomic status of some Eocene cricetid taxa is also doubtful. A parsimony analysis based on 65 cranial and dental characters and including 22 early Myomorpha was performed to elucidate these issues. As a result, the North American Elymys, known as the first Myodonta, belongs...

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Dental microwear patterns of extant and extinct Muridae (Rodentia, Mammalia): ecological implications

Helder Gomes Rodrigues, Gildas Merceron, Laurent Viriot

The Science of Nature > 2009 > 96 > 4 > 537-542

Extant species of Muridae occupy a wide array of habitats and have diverse dietary habits. Consequently, their dental microwear patterns represent a potential clue to better understand the paleoecology of their extinct relatives, which are abundant in many Old World Neogene localities. In this study, dental microwear is investigated for specimens of 17 extant species of murine and deomyine rodents...

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