Sergio RS Cevallos-Ferriz

Sergio RS Cevallos-Ferriz
Universidad Nacional Autónoma de México | UNAM · Department of Paleontology

Dr.

About

141
Publications
31,386
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2,425
Citations
Additional affiliations
October 1978 - January 2016
Universidad Nacional Autónoma de México
Position
  • Researcher of the Paleontology Departement, Instituto de Geología

Publications

Publications (141)
Article
Full-text available
Paleobotany bears an invaluable source of knowledge for understanding the history of the biodiversity that we protect and care for today. This discipline is recognized as a source of information on physical, ecological, and biological events and processes that occurred in the past and are maintained today, but whose occurrences must be interpreted...
Article
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A new middle Cretaceous trilobed leaf, Araliaephyllum silvapinedae sp. nov., collected near the town of Cabullona, Sonora, Mexico, in La Cintura (Albian–Cenomanian) Formation, is described and identified through two comparative methods.: a leaf architecture analysis and the morphometric analysis of its shape. These allowed close comparison of the C...
Article
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We report K–Pg-age deposits in Baja California, Mexico, consisting of terrestrial and shallow-marine materials re-sedimented onto the continental slope, including corals, gastropods, bivalves, shocked quartz grains, an andesitic tuff with a SHRIMP U–Pb age (66.12 ± 0.65 Ma) indistinguishable from that of the K–Pg boundary, and charred tree trunks....
Article
The paleofloras of Central America are little known, and on this occasion, woods from the Miocene of Chalatenango, El Salvador, are reported. The identification was carried out from the elaboration of thin sections that allowed observation of anatomical patterns. Later, they were compared with woods of current and fossil taxa already described in t...
Preprint
Full-text available
Premise of study “El Chango” is a recently discovered quarry that contains extremely well preserved fossils. The Cenomanian age of the locality corresponds to a time when the global flora was transitioning from gymnosperm- to angiosperm-dominated, yet conifers predominate in this locality. These fossils thus provide a rare opportunity to understand...
Article
A new wood type for the Baja California Cretaceous adds to the plant diversity so far known for the area where gymnosperms seem to be dominant. It was collected near El Rosario, Baja California, from rocks of the Rosario Formation, in a sedimentary sequence that comprises ca. 1200 m of non-marine to deep marine sediments from Upper Campanian to Low...
Article
Background: Celastraceae is a morphologically heterogeneous family. For this reason, the inclusion of some taxa within this group is controversial. Recently this problem has become significant since its fossil record is recognized as an important source of information for evolutionary studies, especially those using molecular clocks which require a...
Article
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Permineralized palm stems and adventitious roots are classified under specific organ-type genera (Palmoxylon or Rhizopalmoxylon) without affinities below the family level. Fragments of vegetative basal axes provide an incomplete picture of histological changes due to axial and radial differences in cell growth. However, stem and root anatomical des...
Article
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Climatic conditions that prevailed during the deposition time of the Tehuacán Formation, Mexico (upper Oligocene) are proposed based on a previous model using wood anatomical characters. Different paleoclimatic variables were calculated, and the anatomical characteristics of the Tehuacán Formation paleoflora were compared with the characteristics o...
Article
Recent fossil findings of well-preserved plants in deposits of the Cabullona Group (Campanian-Maastrichtian) indicate that in this region grew an abundant flora. In order to contribute to the knowledge of its paleodiversity, three silicified trunks more than 4 m in length and a stump of 72 cm high discovered close to the town of Fronteras, in sands...
Article
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A fragment of mummified wood collected from a Quaternary sedimentary sequence of Lake Chalco, Central Mexico, in the depocenter of the Basin (19°15ʹ26ʺN, 98°58ʹ32ʺW), has anatomical characteristics of Abies. Identification is based on the presence of a warty layer in the walls of the tracheids, prismatic crystals in ray cells, taxodioid pits in the...
Article
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Los organismos se desarrollan y lo que evoluciona es el genoma; además, si la innovación funciona sigue adelante, si no se selecciona. Así, la evolución es la acumulación sucesiva de eventos favorables. Estos últimos quedaron registrados en la morfología y anatomía de los organismos conservados en las rocas, como fósiles. Mediante la comparación de...
Article
Although there are reports of permineralised woods in Mesozoic and Cenozoic strata in Mexico, there are few palaeobotanical studies based on coniferous stems. Four taxa of fossil wood from three localities in Mexico are described at the anatomical level and identified taxonomically based on detailed comparisons with woods of extant and fossil taxa....
Article
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A new flower preserved in amber in sediments of Simojovel de Allende, México, is identified as an extinct member of Staphyleaceae, a family of angiosperms consisting of only three genera ( Staphylea , Turpinia and Euscaphis ), which has a large and abundant fossil record and is today distributed over the Northern Hemisphere. Staphylea ochoterenae s...
Article
The fossil record of conifers in Mexico is poor and scattered. It is restricted to the Mesozoic in northern Mexico and becomes younger towards Southern and Central Mexico. This paper describes and identifies Pinaceae conifers from Late Campanian (± 72 Ma) rocks near the town of Esqueda, Sonora. Interpretations are based on leaves and an ovulate con...
Article
A new fossil flower preserved in amber from Miocene sediments of Simojovel de Allende, Mexico, is described and recognized as a new member of Celastraceae. This fossil flower is bisexual, with a 5-merous perianth and extrastaminal disk, furthermore the presence of two stamens inserted in the inside surface of a pentagonal disk and ovoid pistil cons...
Conference Paper
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Plant megafossils collected from different localities in Northern Mexico have yielded leaves and woods that have characteristics suggestive of Lauraceae affinity. A wood sample from an Upper Cretaceous sequence close to El Rosario, Baja California, has distinct growth rings, diffuse porosity, alternate vestured intervascular pits, simple perforatio...
Article
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The history of Mexican vegetation is mainly known through extrapolations based on its extant flora and/or paleobotanical work done in other countries. While macrofossils corroborate that in the past, as in the present, the Mexican flora had relationships with those of other areas, its study reveals that during the Cretaceous it had affinities with...
Article
Permineralized infructescences are described from the Cerro del Pueblo Formation, Coahuila, Mexico. Morphological and anatomical observations of 584 infructescences support the identification and reconstruction of an infructescence, with fruit developed as nutlets. The fruit are each surrounded by bracts, and have a persistent style and stigma. The...
Article
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Amber from Simojovel de Allende, Chiapas, Mexico, is one of the most important Miocene deposits worldwide; however paleontological studies based on material from the area are scarce, especially those related to plants. This taxonomic work confirms the presence of Salicaceae sensu lato in the deposit based on an inconspicuous bisexual flower, with a...
Article
Life cycle variations in the morphological and behavioral traits of modern pennate diatoms are known for a wide variety of genera and it is assumed that patterns of asexual and sexual reproduction (e.g. size reduction and auxosporulation) have remained essentially unchanged since their origin. We show here that many characteristics of modern pennat...
Article
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The fossil record of Mexico has been studied very little, and few attempts have been made to incorporate it into the historical discussion about the origin of the vegetation in the region. At best, some examples from Neogene and Quaternary periods have been used to explain the extant biodiversity, and the poor fossil record of the Cretaceous has on...
Article
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The Cintura Formation of Albian–Cenomanian age in the Cabullona Basin yielded an important fossil flora, including palynomorphs, leaf impressions and fossil trunks. At the base of the Marquechi Member a poorly preserved palynomorph assemblage is recognised. The palynological assemblage is dominated by gymnosperms, mainly by cheirolepidiacean genus...
Article
Fossil woods from the El Cien Formation have yielded important information on the taxonomic composition and climate of a flora established in the west coast of Mexico during the Miocene. This report of a new genus and species, Ruprechtioxylon multiseptatus Cevallos-Ferriz, Martínez Cabrera et Calvillo-Canadell, is based on woods with the following...
Article
A wood type preserved in Oligocene sediments of Coayuca de Andrade, Puebla, Mexico, is described and compared to Loxopterygium Hook.f. (Anacardiaceae). Among the characters that sustain this assignment are growth rings are marked by 2–3 rows of flattened latewood fibers. The vessel elements are circular to oval, predominantly solitary and radial mu...
Article
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This paper describes the first Permian walchian conifer from Mexico based on several specimens preserved as compressions/ impressions. The material comes from the Tuzancoa Formation in the state of Hidalgo, Central Mexico. It is described as Calnalia hidalguensis gen. nov. et sp. nov. a new conifer morphotaxon based on isolated lateral branches wit...
Chapter
The Esqueda locality is well known for its quarries, which provide shales that are used for construction and that also contain dinosaur ichnites. This study determines the age of the shale deposits. A late Campanian age is suggested for the uppermost part of the Cabullona Group for the whole Esqueda section, based on palynological assemblages and U...
Article
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Fossils have always been an intriguing and spectacular source of information for naturalists who discuss how life and diversity came about. In plants, it is difficult to find in the fossil record all organs or plant parts in connection to each other. Thus, many angiosperms are sketched as undefined entities that somehow resemble an extant relative....
Article
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History of plant diversity in Mexico might be sought in detailed descriptions and comparisons of fossil taxa. Fossil plants allow the recognition of plant communities and their history, especially if they include key elements. In Mexico, Bursera is correlated with dry tropical habitats, and its presence in the fossil record certainly helps to trace...
Article
Full-text available
Fossils have always been an intriguing and spectacular source of information for naturalists who discuss how life and diversity came about. In plants, it is difficult to find in the fossil record all organs or plant parts in connection to each other. Thus, many angiosperms are sketched as undefined entities that somehow resemble an extant relative....
Article
A rich decapod crustacean assemblage from the Upper Cretaceous (Cenomanian; Sierra Madre Formation) of El Chango quarry (Chiapas, Mexico) is reported here. Four new genera of shrimps, Zoquepenaeus nov., Tzeltalpenaeus nov. (Penaeidae Rafinesque-Schmaltz, 1815), Mexicania nov. (Sicyoniidae Ortmann, 1898), and Mokaya nov. (Sergestidae Dana, 1852) are...
Article
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Two Miocene woods collected in “Arroyo Maderas” locality, Marques de Comillas municipality, Chiapas, collected by members of Paleobotany Laboratory of the Instituto de Geología, UNAM and the Eliseo Palacios Aguilera Paleontological Museum of Tuxtla Gutierrez, Chiapas, are described. Their wood structure have anatomical features that make them diffe...
Article
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Cretaceous vegetation of Mexico is known primarily in Baja California, Sonora, Coahuila and recently in the town “El Chango”, Chiapas, where there have been fish, molluscs, crustaceans, etc., but in recent years also collected hundreds of sheets conifers, several cones, and about sixty specimens of angiosperms. Chiapas is the fourth state of Cretac...
Article
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The diversity and richness of fossil conifers in Mexico is poorly known and its presence since the Cretaceous is sporadic, although they have been documented since the first half of last century. In Mexico part of the history of certain groups of conifers has been documented, but it has been enriched in recent years by the collection of well-preser...
Article
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The relationship between vegetation and climate in the fossil represents a good proxy paleoclimatic, and as a basis or principle of these studies found a close correlation with biological actualism. The leaves are the most susceptible organ of plants because respond to the environment in which they grow. Studies have been conducted to demonstrate t...
Article
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Simojovel de Allende, Chiapas, Mexico, is one of the amber deposits in the world with exceptionally preserved biological evidence of plants and animals. Within the paleobotanical record of the area members of Anacardiaceae, Leguminosae, Meliaceae and Arecaceae have been reported based on flowers, which are a special case because of its delicate and...
Article
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INTRODUCCIÓN Las coníferas se caracterizan por ser árboles o arbustos con madera secundaria constituida por traqueidas, hojas simples con una sola vena o venación paralela, tienen producción de resina y sus estructuras reproductivas están separadas en conos masculinos y femeninos. Los conos masculinos son simples, mientras que los conos femeninos s...
Article
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El estudio de las plantas del Cretácico Superior de Coahuila ha permitido reconocer una diversa flora que parece compartir elementos con flora de latitudes mayores, pero a la vez muestra una pequeña pero clara diferencia en la composición de la vege-tación que creció hace 70 a 65 millones de años en la Formación Olmos de la Cuenca Carbonífera y en...
Article
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Secondary xylem variation among angiosperm species of different genera has been explained based on the anatomy-ecology relationship. Since at times this information does not allow the establishment of clear limits between fossil species, the use of morpho-genera is used to describe particular wood anatomical patterns. This is the case in Paraphylla...
Article
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Among the many explanations for the large biological diversity of Mexico is that it is the result of the contact between the Nearctic and Neotropical biotas; however, this contact-related explanation is not fully satisfactory and needs further examination in the light of historical biogeography. We offer newer insights into this issue by examining...
Article
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El origen de la vegetación actual de México y su diversidad tiene larga historia. Posiblemente es la extensión de esta historia el punto en que discrepan las propuestas, una planteando que inicia en el Cretácico (ca. 132 ma) y otras haciendo énfasis en procesos restringidos al Plio-Pleistoceno (5.3 ma), sobre todo si se refieren al origen de la veg...
Article
Trees and shrubs tend to occupy different niches within and across ecosystems; therefore, traits related to their resource use and life history are expected to differ. Here we analyzed how growth form is related to variation in integration among vessel traits, wood density, and height. We also considered the ecological and evolutionary consequences...
Article
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One wood block and many small twigs (up to 1.3 cm diam.) with little secondary growth and showing magnoliaceous characters were identified from the Princeton chert locality (Middle Eocene) of British Columbia, Canada. Specimens were studied with a modified cellulose acetate peel technique and hydrofluoric acid. Well-preserved primary tissues includ...
Article
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A small assemblage of fossil legume fruits, leaf fragments, and leaflets has been recovered from the Tertiary (Oligocene) "Los Ahuehuetes" flora near the town of Tepexi de Rodríguez, Puebla, in south-central Mexico. Five legume fruits are described and compared with fruits of extant genera. Four fruit types were identified as belonging to the moder...
Article
A new plant from the Los Ahuehuetes locality, near Tepexi de Rodríguez, Puebla, Mexico, is described based on its leaves. They are characterized by being ovate to elliptic, 4.5 cm long by 2.1 cm wide, having an entire margin, eucamptodromous venation, a midvein that is slightly curved and attenuated towards the leaf apex, seven pairs of secondary v...
Article
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Unlabelled: Premise of the study: The Olmos Formation was part of a system of deltas that existed in the southern portion of the Western Interior of North America during the Campanian-Maastrichtian. The paleofloristic composition from the northern portions of the Epicontinental Sea is relatively well known, but less intensive exploration in the...
Article
A diverse biota included in the amber of the early Miocene La Quinta Formation, Simojovel de Allende, Chiapas, Mexico, includes nicely preserved flowers of the legume genus Hymenaea (Caesalpinioideae: Detarieae), the same plant that produced the amber-forming resin. Our observations confirm the presence of two distinct species. Hymenaea mexicana Po...
Article
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En la Formación Olmos, Cretácico Superior (Campaniano superior-Maastrichtiano inferior), se han recolectado diferentes tipos de plantas con flor y coníferas. Un nuevo estípite representa una nueva especie del morfogénero Palmoxylon Schenk (Arecaceae), P. enochii sp. nov. La porción del estípite conocida de esta nueva planta tiene haces vasculares o...
Article
The extant regional vegetation of Panotla, Tlaxcala, Mexico, is the result of its geography, mainly due to the buildup of the Mexican Trans-volcanic Belt. Before this volcanic belt originated, palaeobotanical evidence suggests that topographic, palaeoclimatic and ecological conditions were different, allowing the establishment of an evergreen tropi...
Article
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Two aquatic plant genera assignable to Decodon (Lythraceae) and Ceratophyllum (Ceratophyllaceae) are described based on reproductive structures collected from the Cerro del Pueblo Formation (late Campanian [73.5ma]), Coahuila, Northeast Mexico. Decodon is represented by three small seeds with a pyramidal shape, rounded borders, and a concave ventra...