Susana Damborenea

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• PhD
• Senior Researcher at National University of La Plata

The knowledge on decapod crustaceans considerably increased in recent years, including that of the glypheid lobsters, known from the Early Jurassic to the present. On the basis of known occurrences worldwide, we analyze the spatial and temporal distribution of 86 species of the family Glypheidae and provide a general description of their history si...

This paper is a synthesis of the knowledge on the Jurassic coral-dominated communities of Argentina, providing novel information for some of them. Scleractinian corals were scarce during the Hettangian-Sinemurian, but were frequent and diverse during the Pliensbachian. Three main communities are recognized for this last age: the earliest Pliensbach...

Coral-reefs suffered during the end-Triassic extinction event, being scarce during the Early Jurassic. This paper deals with an Early Pliensbachian reef from Puesto Araya, southern Mendoza, Argentina. Five sections were logged ensuring lateral and vertical coverage across the reef outcrop. All determinable associated faunal elements of the reef wer...

The Toarcian Oceanic Anoxic Event (T-OAE, ~183 Ma) was marked by globally recognized environmental perturbations, most notably disturbances to the global carbon cycle and climate. To date, geochemical records providing information about the T-OAE have been largely generated from the warm temperate climate zone of the NW European realm. Coeval geoch...

Drilling for the International Continental Scientific Drilling Program (ICDP) Early Jurassic Earth System and Timescale project (JET) was undertaken between October 2020 and January 2021. The drill site is situated in a small-scale synformal basin of the latest Triassic to Early Jurassic age that formed above the major Permian-Triassic half-graben...

Los ecosistemas arrecifales colapsaron a nivel global durante la crisis del Triásico Tardío, estando prácticamente ausentes durante las primeras edades del Jurásico Temprano. Durante el Pliensbachiano aparecen estructuras coralinas en pequeña escala en la Cuenca Neuquina. En este trabajo se presentan algunos resultados preliminares acerca de la mic...

The Pliensbachian–Toarcian boundary interval is characterized by a ~ 3‰ negative carbon-isotope excursion (CIE) in organic and inorganic marine and terrestrial archives from sections in Europe, such as Peniche (Portugal) and Hawsker Bottoms, Yorkshire (UK). A new high-resolution organic-carbon isotope record, illustrating the same chemostratigraphi...

Since the initial opening of the Atlantic Ocean in the Early Cretaceous, the eastern margin of southern South America has been affected by several marine transgressions that left behind a rich sedimentary and paleontological record documenting the paleogeographic and paleoclimatic changes that took place. We briefly review the main changes in the f...

The Arroyo Malo Formation represents the first marine ingression during the Late Triassic in the Neuquén Basin, west-central Argentina. The presence of calcareous nannofossils in this unit provides independent age constraint of a late Norian to Rhaetian age for its lower and middle parts, in agreement with known fossil invertebrates. Furthermore, t...

The Arroyo Malo Formation represents the first marine ingression during the Late Triassic in the Neuquén Basin, west-central Argentina. The presence of calcareous nannofossils in this unit provides independent age constraint of a late Norian to Rhaetian age for its lower and middle parts, in agreement with known fossil invertebrates. Furthermore, t...

The Pliensbachian–Toarcian boundary interval is characterized by a ~3‰ negative carbon-isotope excursion (CIE) in organic and inorganic marine and terrestrial archives from sections in Europe, such as Peniche (Portugal) and Hawsker Bottoms, Yorkshire (UK). A new high-resolution organic-carbon isotope record, illustrating the same chemostratigraphic...

Bivalves of the Order Trigoniida were abundant and diverse in the Andean Early Jurassic shallow-marine paleoenvironments. Based on extensive collections with detailed stratigraphic information from 40 localities in central-western Argentina, we describe 20 species (4 new) belonging to 11 genera (3 new) and 5 families (Groeberellidae, Trigoniidae, P...

Species of the pectinid genus Weyla s.l. were previously reported from several localities in Alaska, where they have a wide age range within the Early Jurassic. This paper provides a full description and discussion of the new species Weyla santuccii, believed to be the oldest of the group.

La biósfera, es decir, el conjunto de los seres vivos de nuestro planeta más el agua, la tierra y el aire, enfrenta actualmente una crisis de la diversidad vinculada, en buena medida, con la acción humana. Ante la rápida desaparición de especies debemos preguntarnos cuáles serían las con-secuencias de una posible extinción en masa y cómo se vería a...

Knowledge on Early Jurassic marine fossil invertebrates from Argentina is very uneven. Particularly, faunas from Chubut Province received less attention and were thought to be poorer than those from the Neuquén Basin. Nevertheless, an updated revision of bivalves shows that some groups, such as the Protobranchia, were relatively more diverse in Chu...

The new endemic genus Neuquemya , from Pliensbachian deposits in west-central Argentina, is here described and tentatively referred to the Cuspidariidae on account of its shell characters. The new species Neuquemya leanzaorum has a thin, inflated shell, rounded anteriorly and rostrate posteriorly, with a narrow posterodorsal gape and opisthogyrous...

A REVIEW OF JURASSIC MARINE WORLWIDE BIOCHOREMAS BASED ON THE DISTRIBUTION OF BIVALVE MOLLUSKS. Local and regional papers analyzing the distribution of Jurassic bivalves and proposing new palaeobiogeographic units of various ranks are numerous, but a worldwide synthesis was lacking. This paper is a review of those proposals with the aim to obtain a...

We analyze the Late Triassic extinction and Early Jurassic recovery of bivalve faunas within marine environments in the Atuel River area of the Neuquén Basin, Argentina. Data were collected from a hundred samples with invertebrates in a well-exposed uppermost Triassic to lower Jurassic section in the Neuquén Basin (southern Mendoza Province, Argent...

After a diversity peak during the Late Triassic, corals were severely affected by the end-Triassic extinction. The study of their recovery is fundamental for a better understanding of the ecological rearrangement undergone by Early Jurassic marine invertebrate faunas. In this contribution we analyze the morphologic recovery shown by scleractinians...

The bivalve ligament provides the thrust for shell opening, acting as the resistance in a lever system against which adductor muscle effort is applied. Usually, its outer lamellar layer is subjected to tensile stress, while the inner fibrous layer is compressed, with the pivotal axis located between them. However, opisthogyrate rostrate bivalves di...

The extensive outcrops of the Late Jurassic-Early Cretaceous Vaca Muerta Formation black shales and marls in the Neuquén Basin have yielded very few bivalves, and these are not well-known. The material described here was collected in central Neuquén, from late Tithonian calcareous levels within the black shales, between beds with Substeueroceras sp...

The Toarcian oceanic anoxic event (T-OAE) is recorded by the presence of globally distributed marine organic carbon– rich black shales and a negative carbon isotope shift, with δ13Corg values as low as -33‰, interrupting an overarching positive excursion. Here we present new biostratigraphic data and high-resolution δ13Corg data from two Southern H...

Nine gastropod species are reported from early Bajocian marine deposits at two localities in the Neuquén Basin, supplying the first detailed documentation of six gastropod families from the Middle Jurassic of Argentina at that time.The new gastropod species include Pleurotomaria bajociana sp. nov. (Pleurotomariidae); Cryptaulax weaveri sp. nov. and...

Presence-absence bivalve species data for each Early Jurassic stage along southeastern South America between 20° and 46° present-day latitude were processed by a set of analytical methods to analyse the palaeolatitudinal patterns of diversity and distribution. The expected decrease in species diversity towards higher latitudes is punctuated by a co...

Trochotomidae is a small but very distinctive extinct family of pleurotomarioidean gastropods characterized by trochiform shells with an elliptical trema. Two new species of trochotomids are described from Pliensbachian deposits in the Neuquén Basin, Argentina. The new genus-group name Placotoma is proposed to replace the pre-occupied name Discotom...

Several Jurassic pterioid bivalve species have been referred to Parainoceramus Cox by different authors, yet this has proved inadequate because the meaning of such genus has been compounded by nomenclatural and idiomatic problems, as well as misinterpretations. Hence, the new genus Parainoceramya is here proposed to accommodate several species prev...

The systematic position of the fossil species referred to Calliotropis is currently under debate due to the striking resemblance between these forms with their extant counterparts in general shell morphology and ornament pattern. We propose two temporal subgenera of Calliotropis: Calliotropis (Riselloidea) for Mesozoic species and Calliotropis (Cal...

Marine bivalve genera that were described or mentioned for Triassic and Lower Jurassic deposits worldwide are reviewed in terms of their validity, stratigraphic range, paleogeographic distribution, paleoautecology, and shell mineralogy. Data were originally compiled at species level and are arranged systematically. A brief discussion for each genus...

The Early Jurassic epoch was a time of extreme environmental change: there are well-documented examples of rapid transitions from cold, or even glacial, climates to super greenhouse events, the latter characterized worldwide by hugely enhanced organic carbon burial, multiple large isotopic anomalies, global sea-level change, and mass extinction (Pr...

On the basis of the distribution of benthonic Jurassic bivalve genera in the Southern Hemisphere paleobiogeographic units (biochoremas) were characterized according to their biologic contents (mainly levels of endemism and BSN analysis). Two first-order paleobiogeographic units are recognized for this region: Tethyan and South Pacific. Their evolut...

In South America, autochthonous archaeocyathan faunas preserved in Early Cambrian limestones have not been found yet. Nevertheless, a few well-documented occurrences of these fossils in clasts contained in coarse-grained rocks of a wide age range have been discovered in recent years. Erratic limestone blocks from the Late Carboniferous–Early Permia...

Preface The study of global biodiversity changes is a strong issue these days, as we become aware of the fragility of the Earth system and the urgent need to understand it better to keep it working. One of the key aspects of biodiversity is the distribution of organisms, and biogeography is the discipline which tries to recognize and characterize t...

First-hand knowledge of Triassic and Jurassic bivalve faunas from western South America can be applied to the discussion of several regional issues related to paleobiogeography, such as the close relationship of bivalve local distribution with sedimentary facies. Special attention is paid to the analysis of bivalve species distribution along a 25°...

Mesozoic bivalves have been the subject of many paleobiogeographic studies, either with the aim of recognizing units, to argue about the proposal of opening of seaways and exotic terranes movements, or even to relate biogeography with extinction and evolution. With a few notable exceptions, Northern Hemisphere data were used and frequently conclusi...

Southern Hemisphere bivalves have provided arguments for the analysis of some interesting topics of global significance, such as bipolarity and the establishment of seaways. The records of Triassic and Jurassic bivalves with bipolar distribution are numerous, and show that bipolarity was a persistent phenomenon in marine environments for hundreds o...

Databases used for the analysis of past biotas should be as internally consistent as possible taking into account the incompleteness of the fossil record and the taxonomic distortions due to the history of their knowledge. A comprehensive and critically updated database of Southern Hemisphere bivalve occurrences through the Triassic and Jurassic wa...

Bivalves have proven to have a great potential for paleobiogeographic analyses due to their relatively complete fossil record, especially for Mesozoic and Cenozoic times. Being mostly benthonic, they have a large variety of life habits which should be taken into account, particularly in detailed paleobiogeographic studies. We will analyze marine bi...

The study of palaeodemecological features requires some particular taphonomic conditions. These conditions were met in the Mulichinco Formation (Valanginian), where burrowing bivalve trace fossils are widespread and often appear in cross section on bedding surfaces. Two groups of such beds were analyzed, measuring population density, spatial distri...

The present analysis indicates that, although the Triassic–Jurassic extinction strongly impacted bivalve taxonomic diversity, it had little impact on bivalve ecologic diversity. Not a single bivalve life strategy was eliminated at the end of the Triassic. The process of infaunalization began for bivalves in the Late Triassic and proceeded unabated...

The Atuel river section in southern Mendoza Province, Argentina, is one of the few South American localities where the Triassic/Jurassic transition occurs in fully marine deposits. Bivalves and brachiopods from the poorly diverse Late Triassic macrofauna are described, most of them found below the level with Choristoceras cf. marshi HAUER. The faun...

The ichnogenus Lapispira Lange (originally recognized in the Hettangian of Germany) attained a wide geographic distribution, occurring mainly in Jurassic sediments. The ichnotaxon was recently re-described from Sinemurian-Pliensbachian deposits in southern Mendoza Province (Argentina), and is here newly reported from slightly younger deposits of th...

The Atuel river section in southern Mendoza Province, Argentina, is one of the few South American localities where the Triassic/Jurassic transition occurs in fully marine deposits. Bivalves and brachiopods from the poorly diverse Late Triassic macrofauna are described, most of them found below Choristoceras cf. marshi Hauer. The fauna contains 15 b...

Dr. Alberto Riccardi has greatly impacted in the advance of palaeontological and geological knowledge in several areas of the world, particularly in Latin-America. Riccardiceras, the stephanoceratacean genus belongs to Stephanoceratidae and is almost pandemic. The genus was dedicated by the eminent palaeontologist Dr. Gerd Westermann, long standing...

The ichnogenus Lapispira Lange (originally recognized in the Hettangian of Germany) attained a wide geographic distribution, occurring mainly in Jurassic sediments. The ichnotaxon was recently re-described from Sinemurian-Pliensbachian deposits in southern Mendoza Province (Argentina), and is here newly reported from slightly younger (latest Pliens...

An Early Jurassic fossil bivalve specimen belonging to the pectinid genus Weyla was found within the low human occupation levels in a structure of Pukara de La Cueva, Humahuaca department, Jujuy province, Argentina. This is clearly a geologically allochthonous record, and its source should be located more than 400km away, probably from a locality i...

The Cretaceous Huitrín Formation in west-central Argentina records the final connection of the Neuquén Basin to the Pacific Ocean. This formation is comprised of a variety of continental to marginal-marine sediments deposited behind an Andean volcanic arc under warm, arid paleoclimatic conditions. Here we focus on a bivalve fauna from carbonate ram...

A well-preserved decapod specimen was found in early Toarcian deposits cropping out on the western slope of Meseta Catreleo, central Chubut province, Argentina. It is a nearly complete exoskeleton preserved in lateral view, slightly crushed, in fine-grained sandstones. The skeleton is mostly articulated, though some pieces are disarticulated or mis...

Massive grey limestone blocks containing a fairly diverse but poorly preserved archaeocyath fauna were recovered from a meta-conglomerate bed in the El Jagüelito Formation (Sierra Grande area, Eastern North Patagonian Massif, Río Negro, Argentina). This is the first documented reference of the presence of archaeocyaths in continental Argentina. Sev...

Jurassic megainvertebrates and their geobiologic significance.- The Neuquén province is a key area for the study of the Argentine Mesozoic record, in particular the marine Jurassic fossiliferous deposits. The successive changes in sea level, sedimentary input and continental shelf extent generated a variety of environments and usually contributed t...

The Toarcian, Early Jurassic, Oceanic Anoxic Event (T-OAE: ~183 Ma) was characterized by relatively high mid-latitude sea-surface temperatures (~6°C warmer than present), mass extinction, and the deposition of sediments rich in organic carbon (black shales). The T-OAE correlates with emplacement of a large igneous province (Karroo-Ferrar) and is as...

The first record of the Early Toarcian Oceanic Anoxic Event ( c . 183 Ma) from the Southern Hemisphere is described from the Neuquén Basin, Argentina, identified chemostratigraphically on the basis of a relative increase in marine organic carbon and a characteristic negative carbon-isotope excursion (δ ¹³ C org ) in bulk rock and fossil wood. The n...

Bivalve mollusks from the Triassic-Jurassic transition collected in eight localities in Asturias and the western Basque-Cantabrian Basin (Palencia province) are systematically revised. Preservation is poor at all localities. The dominant Rhaetian bivalves are Isocyprina concentrica (Moore) and Bakevellia (Bakevelloides) praecursor (Quenstedt). Thes...

Bivalve mollusks from the Triassic-Jurassic transition collected in eight localities in Asturias and the western Basque-Cantabrian Basin (Palencia province) are systematically revised. Preservation is poor at all localities. The dominant Rhaetian bivalves are Isocyprina concentrica (Moore) and Bakevellia (Bakevelloides) praecursor (Quenstedt). Thes...

South American scientific periodicals are regarded as "obscure journals" due to their low visibility and difficult access. In an increasingly web-dependent world, the result is that a large amount of science produced locally in South America is ignored. How are globalization trends in scientific publications impacting on South American geology? A s...

In the Early Jurassic, the Toarcian, Oceanic Anoxic Event (~180 m.a.) was characterized by high sea surface temperatures (~6°C warmer than present), mass extinction, large igneous province emplacement, and the deposition of sediments rich in organic carbon. However, most studies of the event have focused on the northern hemisphere sections, leading...

The genus Lithotrochus (Gastropoda, Trochidae) is known in the Andean region from northern Peru to Argentine Patagonia, is endemic to this area and has a short time range (Sinemurian-Pliensbachian). Lithotrochus humboldtii (von Buch) is one of the first Mesozoic gastropod species described for South America. Almost all previous descriptions and fig...

The genus Lithotrochus (Gastropoda, Trochidae) is known in the Andean region from northern Peru to Argentine Patagonia, is endemic to this area and has a short time range (Sinemurian-Pliensbachian). Lithotrochus humboldtii (von Buch) is one of the first Mesozoic gastropod species described for South America. Almost all previous descriptions and fig...

The hitherto rarely recorded ichnogenus Lapispira Lange is a concentrically arranged double helicoidal U-burrow, subperpendicular to bedding, without branching. It is redescribed on the basis of abundant material occurring in Sinemurian to Pliensbachian deposits at the Atuel valley area of the Neuquén basin (Mendoza, Argentina). The regular coiling...

External estuarine facies in Late Sinemurian beds from the base of the Puesto Araya Formation in the Atuel river region, Mendoza Province, Argentina, contain concentrations of a new species of Cardinioides (a shallow burrowing suspension-feeding Pachycardiidae bivalve) and a low diversity benthic fauna. These bivalves appear in tidal inlet facies o...

Ameghiniana ha acompañado paso a paso el desarrollo de la Paleontología en Argentina desde 1957, y no solamente ha contribuido a la evolución local de nuestra ciencia a nivel académico, sino también ha provisto de material básico que se utiliza en otras ramas de las Ciencias de la Tierra, ya sea académicas o aplicadas, como la exploración de hidroc...

Based upon extensive sampling with strict stratigraphical control on Hettangian and Sinemurian deposits cropping out at the river Atuel region (southwest Mendoza Province), the presence of all bivalve and brachiopod genera was recorded. Data gathered from the analysed interval were processed by multivariate analysis and the resulting Q-mode dendrog...

The Triassic-Early Jurassic genus Kalentera belongs to a bivalve group which was diverse and widely distributed during Late Palaeozoic times (family Kalenteridae). The family survived the Permo-Triassic crisis but only represented by a few genera, and Kalentera lingered into the Jurassic to become extinct at the end of the Early Jurassic (Toarcian)...

The Arroyo Malo Formation at Alumbre Creek, on the northern bank of the Atuel River, west central Argentina, comprises a c. 300 m thick continuous marine succession across the Triassic-Jurassic System boundary consisting of massive and laminated pelites indicative of a slope depositional environment. Late Triassic invertebrates, including an.rmonoi...

thropteris sp. La sezione e stata anche campionata per quanto riguarda conodonti e radiolari, finora con risultati negativi. Uno studio paleo-magnetico e in corso. Abstract. The Arroyo Malo Formation at Alumbre Creek, on the northern bank of the Atuel River, west central Argentina, comprises a c. 300 m thick continuousmarine succession across the T...

The distribution of benthonic Jurassic bivalve genera in the Southern Hemisphere is analysed here. For this region, palaeobiogeographic units (biochoremas) are quantitatively characterized according to their biologic contents (mainly levels of endemism). Their evolution through time is followed from the latest Triassic to the earliest Cretaceous. T...