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Quetecsaurus rusconii gen. et sp. nov., UNCUYO-LD-300.1, right postorbital. 1, lateral view; 2, medial view; 3, dorsal view; 4, anterior view. Scale bar = 5 cm.
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Quetecsaurus rusconii gen. et sp. nov. is a new titanosaur (Dinosauria, Sauropoda) from the Neuquén Basin of Mendoza Province, Argentina. The specimen comes from red mudstones of the Cerro Lisandro Formation (middle-late Turonian, Upper Cretaceous), and is the first sauropod with well-preserved remains to be discovered in this formation. The holoty...
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... and was Director of the Museum of Natural Sciences "Juan Cornelio Moyano". Diagnosis. As for the genus. Leanza [2001], middle Turonian after Legarreta and Gulisano [1989]; middle-late Turonian after Garrido [2010]), Neuquén Cretaceous of Brazil. However, in contrast to these two taxa, the posterior process is more rounded (Fig. ...
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Quetecsaurus rusconii gen. et sp. nov. is a new titanosaur (Dinosauria, Sauropoda) from the Neuquén Basin of Mendoza Province, Argentina. The specimen comes from red mudstones of the Cerro Lisandro Formation (middle-late Turonian, Upper Cretaceous), and is the first sauropod with well-preserved remains to be discovered in this formation. The holoty...
The sauropod dinosaur "Pelorosaurus" becklesii was named in 1852 on the basis of an associated left humerus, ulna, radius and skin impression from the Early Cretaceous (Berriasian-Valanginian) Hastings Beds Group, near Hastings, East Sussex, southeast England, United Kingdom. The taxonomy and nomenclature of this specimen have a complex history, bu...
The supposed base of a slender dermal tail spine from the Inferior Oolite Group (shallow marine deposit, early Middle Jurassic, Aalenian-Bajocian) of Dorset, England, previously reported as "Stegosaurus" and Thyreophora indet., is a half centrum of a caudal vertebra, Archosauria indet. A dorsally and ventrally incomplete vertebra from the same loca...
Embryonic remains within a small (4.75 by 2.23 cm) egg from the Late Cretaceous, Mongolia are here re-described. High-resolution X-ray computed tomography (HRCT) was used to digitally prepare and describe the enclosed embryonic bones. The egg, IGM (Mongolian Institute for Geology, Ulaanbaatar) 100/2010, with a three-part shell microstructure, was o...
Trilophosaurus is a genus of Late Triassic archosauromorph known exclusively from the American Southwest. The defining characteristic of the taxon is its transversely arranged, tricuspid teeth. Here, we document various Trilophosaurus postcrania from the Krzyzanowski bonebed, NMMNH locality 3764, a multi-taxic bonebed located in the Blue Hills of A...
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... Within Titanosauria, the clades Colossosauria and Lognkosauria can be identified, although early branched titanosaurians like Kaijutitan maui [92] (from the Sierra Barrosa Formation; middle-late Coniacian, [23] and titanosaurians with uncertain affiliation like Elaltitan lilloi (from the Lago Colhué Huapi Formation; [93]) are also known. Also, the colossosaurian Mendozasaurus neguyelap [94] emerged from the Sierra Barrosa Formation. Finally, from the Plottier Formation (late Coniacian-early Santonian; [23]), emerge the colossosaurians Petrobrasaurus puestohernandezi [95], Notocolossus gonzalezparejasi [96], and Muyelensaurus pecheni [26], the latter two being the specifier taxa for the clades Lognkosauria and Rinconsauria respectively. ...
The Portezuelo Formation preserves an outstanding record of the upper Turonian – lower Coniacian. Despite the discovery of a significant quantity of sauropod fossil material from the formation, only two species have been formally described to date: Malarguesaurus florenciae and Futalognkosaurus dukei. Here we present new sauropod material mostly composed of non-articulated caudal vertebrae (MCF-PVPH 916 and 917) that belong to two titanosauriforms on the basis of the following features: anterior caudal vertebrae with procoelous-opisthoplatyan articulations, transverse processes that reach the posterior articular face of the centrum and neural spines with a transverse width of around 50% of their anteroposterior length; anterior and middle caudal vertebrae with the neural arch restricted to the anterior half of the centrum; middle caudal centra with circular cross-section. Phylogenetic analysis recovers the new material in close relation to Malarguesaurus within a monophyletic clade at the base of Somphospondyli. This clade shares large pedicel height with a vertical anterior border on the middle caudal vertebrae, a vertical orientation of the neural spines on the distalmost middle caudal vertebrae and proximalmost posterior caudal vertebrae, and subequal relative lengths of the proximal ulnar condylar processes. The specimens presented here are distinct not only from Futalognkosaurus, but also from other indeterminate titanosaurian remains from the same formation. However, there are no significant differences between the specimen MCF-PVPH 917 and Malarguesaurus, but there are differences between the posterior caudal vertebrae of MCF-PVPH 916 and Malarguesaurus, so they could be considered different species. Whilst we err on the side of caution in not naming new taxa here, the two specimens significantly expand what we know about sauropods in the Turonian–Coniacian ecosystems of Patagonia, which will continue to do so as more material is discovered.
Supplementary Information
The online version contains supplementary material available at 10.1186/s12862-024-02280-9.
... The anterior caudal vertebrae (UFRJ-DG 636-R, UFRJ-DG 638-R, UFRJ-DG 606-R) are strongly procoelous, with subcircular outline, while one of the middle caudal vertebrae (UFRJ-DG 635-R) is slightly procoelous, and the other middle caudal (UFRJ-DG 591-R, UFRJ-DG 527-R, UFRJ-DG 704-R) are amphicoelous. This condition (transition of procoelous to slightly procoelous) is observed in Mendozasaurus (González-Riga 2003, Gonzàlez Riga et al. 2018 and Patagotitan (Carballido et al. 2017); but differs from other taxa such as Andesaurus (Mannion and Calvo 2011), Malawisaurus, and Rukwatitan (Gomani 2005, Gorscak et al. 2014, since in these taxa, the anteriormost caudal vertebrae exhibits strongly procoelous condition, while the other anterior caudal vertebrae and, consequently the middle ones, turn to an amphiplatyan condition. The most anterior caudal vertebra recovered for the new Brazilian taxa also differs from Mnyamawamtuka, since the African taxon presents a 'mildprocoely' (Gorscak and O'Connor 2019). ...
Titanosaurs were the most diverse sauropod group during the Cretaceous period, with most of its diversity being found during the Late Cretaceous. In this work, Tiamat valdecii, gen. et sp. nov. is described, a new species of basal titanosaur prospected from the Açu Formation (Albian–Cenomanian), Potiguar Basin, Ceará state, north-east Brazil. Te new taxon is composed by an associated sequence of anterior to middle caudal vertebrae, being diagnosed by four diagnostic features: a marked accessory tuberosity dorsoventrally developed, located on the prezygapophyses; deeply medioventral excavated articulation facets of prezygapophysis and post-zygapophyses articular facets; presence of developed hypantrum–hyposphene articulations; and short middle centra with a well-marked articular facet for the haemal arch. Te phylogenetic analysis reveals that Tiamat valdecii was a basal member of Titanosauria. Tiamat is the first species of Early Cretaceous titanosaur known for the Açu Formation. Biomechanical analysis shows that the tuberosity and excavation of the zygapophyses of the middle caudal vertebrae of Tiamat provide greater stability against shear loads in the amphicoelous vertebrae presented; in addition, they allow greater range of lateral movements without afecting the integrity of the joints. These features may have been an evolutionary alternative for the stability of the middle of the caudal vertebral column. The discovery of T. valdecii in the Açu Formation not only increases the known dinosaur diversity for this unit, but also helps us elucidate part of the first titanosaur radiation.
... In both cases the anteroposterior width is about 1.3 times of transverse width, while Khanazeem saraikistani and Imrankhanhero zilefatmi have anteroposterior width twice of transverse width and Balochisaurus and Qaikshaheen masoomniazi have subequal anteroposterior and transverse widths. The robust tibiae of Imrankhanshaheen masoomniazi and Gspsaurus pakistani have general similarity with those of Atsinganosaurus velauciensis titanosaur from the upper Cretaceous of southern France [118] and Mendozasaurus neguyelap titanosaur from the upper Cretaceous of Mendoza Province, Argentina [119] and Saltasaurus loricatus from late Cretaceous of gosities also extended into adjoining medial and lateral part also. Proximal fibula have medial scar. ...
... Mendozasaurus neguyelap(González-Riga, 2003), andOverosaurus, than apically, where it is narrow and thin, as in other titanosaurs. The SPRL is absent, a condition that MAU-Pv-CO-671 shares with Isisaurus, Overosaurus, Rinconsaurus, and Saltasauridae (e.g., Saltasaurus, Opisthocoelicaudia skarzynskii;Borsuk-Bialynicka, 1977). ...
The Upper Cretaceous fossil vertebrate fauna of the Bajo de la Carpa Formation (Santonian), derived from several different locations in the Neuquén Basin, is relatively abundant and diverse, comprising mainly small to medium-sized reptiles, birds and fishes. The Cerro Overo – La Invernada locality (CO – LI), in the north of the basin, records a similar faunal component for that age, but stands out for its relatively greater abundance and diversity of titanosaur sauropods. The study of the materials presented here allows us to establish the presence of specimens of sauropods other than Overosaurus, the only titanosaur recorded so far in the area, the coexistence of small–medium sized forms with larger forms, which in turn represent some forms with more basal characteristics and others with more derived features. The abundance of the record of sauropods in CO – LI shows both morphological and evolutionary variations, so the discovery of more complete specimens will allow paleofaunistic, paleobiological, and paleoecological studies to be carried out. This will provide a better understanding of the role of titanosaurian sauropods in Late Cretaceous ecosystems.
... . Traukutitan resembles Futalognkosaurus, Mendozasaurus(González Riga, 2003), and Puertasaurus in the morphology of the base of the neural archs and the transverse processes on caudal vertebrae, suggesting that it represents a later Lognkosauria. The size and weight of Traukutitan might be around 30 meters and 30 tons, as that of Futalognkosaurus and Dreadnoughtus.Dreadnoughtus schrani(Lacovara et al., 2014) is one of the most complete giant titanosaurid skeletons: we have some cranial materials, vertebrae, and many pectoral girdle, forelimb, and hindlimb remains (Table 7). ...
This work’s intent is to establish which was the most giant titanosaurid sauropod from Argentina. The evidence is scarce; however, we have tried to select the largest bones of the nine most giant titanosaurids. Argentinosaurus has been proposed as the largest titanosaurid, but recently a new king has been erected: the Patagotitan. In this review, we will see that there are some inconsistences and difficulties to define which is the largest. In other words, giant titanosaurids were a group of sauropods with a variable morphology and probably the overall shape was different. Among the largest titanosaurids, we have included Argyrosaurus superbus, Antarctosaurus giganteus, Argentinosaurus huinculensis, Puertasaurus reuili, Futalognkosaurus dukei, Traukutitan eocaudata, Dreadnoughtus schrani, Notocolossus gonzalezparejasi, and Patagotitan mayorum.
... Posterior dorsal vertebrae also display a columnar med. CPOL that is slightly forked on its dorsal portion by a median groove (*), like the anterior dorsal vertebrae ofMendozasaurus neguyelapGonzález Riga, 2003(González Riga et al., 2018. ...
Titanosaurian sauropods are known to exhibit remarkable body size disparity, with some taxa famed for nearing the zenith of terrestrial vertebrate body size. Here, we describe a new titanosaurian – Ibirania parva gen. et sp. nov. – from the Upper Cretaceous (Santonian–
Campanian) São José do Rio Preto Formation of Bauru Basin, in which represents one of the smallest sauropods known to date. The new taxon is diagnosed by seven autapomorphies and had an estimated body length of 5.7 m. Histological and μCT scan analyses showed that this new taxon is represented by skeletally mature individuals, which had attained somatic maturity prior to death. Phylogenetic analyses recovered the new taxon deeply nested within Saltasaurinae, a clade previously known by small-sized forms. Ibirania parva gen. et sp. nov. brings new information indicating that the body size reduction in some titanosaurians could be driven by recurrent ecophysiographical settings, present in South America prior to the diversity peak attained by the group during the Campanian–Maastrichtian.
... Colaboraron en esta tarea el astrónomo e investigador de CONICET, Dr. Jorge Federico González, y el paleontólogo Dr.L. Ortiz David. El equipo, integrado además por J. P. Coria, G.Sánchez Tirivoli y estudiantes de la FCEN restauraron piezas fósiles y réplicas de las propias colecciones del Museo J. C.. Asimismo, realizaron réplicas de cráneos y de una extremidad completa de titanosaurio de 4 metros de altura, las que fueron donadas para su exhibición.También gestionaron ante las autoridades el traslado y la exhibición, por primera vez en Mendoza, del fósil holotipo de Mendozasaurus neguyelap(González Riga, 2003) junto al primer terópodo descubierto en la provincia, Aerosteon riocoloradensisSereno et al., 2008. La Sala se inauguró con la reapertura del Museo en el año 2015, con la presencia del Gobernador de Mendoza y autoridades de la Universidad Nacional de Cuyo y del CCT CONICET-Mendoza. ...
Resumen. Las investigaciones paleoherpetológicas en la Universidad Nacional de Cuyo (Mendoza) se iniciaron en el año 2012 con el desarrollo
del Laboratorio y Museo de Dinosaurios, el cual fue creado por Bernardo González Riga, recibiendo el apoyo de las autoridades de la Facultad
de Ciencias Exactas y Naturales. Este “Laboratorio y Museo” desarrolla cuatro aspectos claves que se potencian entre sí: investigación, docencia
universitaria, protección del patrimonio paleontológico y extensión social. Fue gestionado y construido por un equipo de investigadores,
profesores, técnicos y estudiantes, destacándose el rol protagónico de L. Ortiz David, J. P. Coria, M.B. Tomaselli, C. Mercado y G. Sánchez Tiviroli.
Para ello se desarrolló un trabajo colaborativo y solidario, teniendo como misión hacer ciencia y acercarla a la sociedad. Las investigaciones se
centran en Sistemática, Filogenia, Paleoecología y Tafonomía de dinosaurios y pterosaurios, así también como en Icnología relacionada con
aspectos anatómicos. Entre los descubrimientos más significativos se encuentran los primeros dinosaurios saurópodos de Mendoza:
Mendozasaurus, Malarguesaurus, Quetecsaurus y Notocolossus, siendo este último uno de los dinosaurios más grandes del mundo. Asimismo, se
destacan otros dos excepcionales descubrimientos: el pterosaurio más grande de América del Sur y el primer yacimiento de huellas fósiles de
dinosaurios de Mendoza, el cual posee ca. 400 icnitas. Este yacimiento ha sido objeto durante 14 años de numerosas gestiones y labores en
terreno para su protección, denominándose hoy Parque Cretácico Huellas de Dinosaurios de Malargüe. La formación del primer equipo
mendocino especializado en dinosaurios contribuyó a la paleoherpetología argentina.
Palabras clave. Mendoza. Paleoherpetología. Dinosauria. Notocolossus. Protección Patrimonial.
Abstract. LABORATORY AND MUSEUM OF DINOSAURS OF THE NATIONAL UNIVERSITY OF CUYO: FOUNDATION, HISTORY AND SCIENTIFIC
DISCOVERIES. The paleoherpetological research at the National University of Cuyo (Mendoza) began in 2012 with the development of the
Laboratory and Museum of Dinosaurs, which was created by Bernardo González Riga, receiving the support of the authorities of the Faculty of
Exact and Natural Sciences. This “Laboratory and Museum” develop four key aspects that enrich each other: research, university teaching, protection
of paleontological heritage and social extension. It is managed and built by a team of researchers, teachers, technicians and students,
highlighting the leading role of L. Ortiz David, J. P. Coria, M.B. Tomaselli, C. Mercado and G. Sánchez Tiviroli. For this, a collaborative and supportive
work is developed, having as a mission to do science and bring it closer to society. The researchers focused on Systematics, Phylogeny,
Paleoecology and Taphonomy of dinosaurs and pterosaurs, and ichnological analyses related with anatomical aspects, as well. Among the
most significant discoveries carried out before and during the development of the Laboratory and Museum are the first sauropod dinosaurs from
Mendoza Province: Mendozasaurus, Malarguesaurus, Quetecsaurus and Notocolossus, the latter being one of the largest dinosaurs discovered in
the world. Likewise, in the South of Mendoza other two exceptional discoveries were made: the largest pterosaur recorded in South America
and the first dinosaur footprints quarry of Mendoza, which has ca. 400 ichnites. This ichnological quarry has been studied and protected for
14 years, following the aim to become this discovery in a natural park known today Cretaceous Park of Dinosaur Footprints of Malargüe. In
Mendoza, the formation of the first team specialized in dinosaurs contributes to Argentine paleoherpetology.
Key words. Mendoza. Paleoherpetology. Dinosauria. Notocolossus. Heritage protection.
... South America has yielded the majority of the titanosaur taxa, including the most basal forms known to date (e.g., Andesaurus, Kaijutitan, Ninjatitan, Triunfosaurus;Calvo and Bonaparte, 1991;Carvalho et al., 2017;Filippi et al., 2019;Gallina et al., 2021), as well as several members of derived clades, such as Lognkosauria (e.g., Futalognkosaurus, Patagotitan, Mendozasaurus;González Riga, 2003;Calvo et al., 2007a;Carballido et al., 2017), Rinconsauria (Overosaurus, Aeolosaurus, Rinconsaurus;Powell, 1987;Calvo and González Riga, 2003;Coria et al., 2013), and Lithostrotia (e.g., Arrudatitan, Tapuiasaurus, Saltasaurus, Baurutitan, Uberabatitan; Bonaparte and Powell, 1980;Kellner et al., 2005;Salgado and Carvalho, 2008;Zaher et al., 2011;Silva Junior et al., 2021). Most of the Titanosauria taxa come from the Cretaceous outcrops of the southernmost part of South America, especially from the Neuquén Basin (Argentina), which represents one of the most thoroughly studied and well-known terrestrial basins due to its abundant and diversified vertebrate fossil record (Leanza et al., 2004;Campos et al., 2005;Kellner et al., 2005;de la Fuente et al., 2007;Gasparini et al., 2007;Fernandes and Ribeiro, 2015;Otero and Salgado, 2015). ...
... The proximal epiphysis is posteromedially fragmented and anterolaterally covered by a firmly cemented matrix, but part of the proximal articular surface is posterodorsally exposed. In proximal view, the articular surface is rough and seems to be oval in outline, with a well prominent medial process, as in Huabeisaurus, Mendozasaurus, Rapetosaurus, and Neuquensaurus (Lydekker, 1893;Pang and Chang, 2000;Curry Rogers and Forster, 2001;González Riga, 2003). Conversely, in lateral view, it is anteriorly directed and slightly anterodorsally inclined, as seen in Phuwiangosaurus and several titanosaurians such as Dreadnoughtus, Epachthosaurus, Jainosaurus, and Rapetosaurus (Huene and Matley, 1933;Lacovara et al., 2014;Powell, 1990;Curry Rogers and Forster, 2001). ...
... The diaphysis is triangular in cross-section, with convex anterior and concave posterior and lateral surfaces. In lateral view, a prominent interosseous ridge for attachment of an interosseous membrane runs distally from almost the middle of the diaphysis up to the posterolateral margin of the distal epiphysis, as in Elaltitan, Mendozasaurus, Neuquensaurus, and Rapetosaurus (Lydekker, 1893;Curry Rogers and Forster, 2001;González Riga, 2003;Mannion and Otero, 2012). This ridge delimits the ulnar articular surface together with a prominent posterior edge on the distal third of the diaphysis that is incomplete due to the fragmented condition of the distal epiphysis. ...
In the Neuquén Basin, the Portezuelo Formation (Turonian-Coniacian, Upper Cretaceous) is represented by extended fluvial outcrops that are well-known for yielding an abundant and diversified vertebrate fossil record. However, most of the sauropod fossil record is represented by incomplete specimens, and only two taxa are formally described for the upper Turonian–lower Santonian of the Neuquén Basin: Malarguesaurus and Futalognkosaurus. In this contribution we report new sauropod specimens composed of partially associated axial and appendicular elements coming from the upper section of the Portezuelo Formation of the Los Bastos locality, in the southern Neuquén Basin. The bones show a set of morphological features that allow us to refer them to a titanosaur sauropod: a “cone-chisel-like” tooth, procoelic caudal vertebrae, a dorsally expanded ulna olecranon, and a femur with a prominent lateral bulge and an elliptical diaphysis in cross-section. The phylogenetic analysis recovers the sauropod remains as an unstable colossosaurian within Titanosauria, an effect likely attributable to the incomplete condition of the specimens. Nevertheless, osteological and phylogenetic analyses, together with morphological comparisons with the sauropod fossil record of the Portezuelo Formation, suggest that the new specimens represent a titanosaur different to previously known taxa. Pending better preserved and more complete remains from Los Bastos, the new evidence allows us to improve our knowledge of sauropod diversity during the upper Turonian–lower Santonian, at least in the southern Neuquén Basin.
... The triangular lateral process of the anterior caudal neural spine of Dzharatitanis was originally described as present as in the Rebbachisaurine sauropods (Averianov & Sues, 2021) lateral tips in that family, here proposed as a probable synapomorphy of Nigersaurinae/Rebbachisaurinae (Whitlock, 2011;Canudo et al., 2018). We consider that this process is absent in this anterior caudal vertebra, in a similar condition observed in some titanosaurs (González Riga, 2003;Carballido et al., 2017;Gallina & Apesteguía, 2015). ...
An isolated vertebra from the Late Cretaceous of Uzbekistan (Asia), previously interpreted as a titanosaur anterior caudal, was recently assigned as the holotype and unique specimen of a new rebbachisaurid taxon, Dzharatitanis kingi. This record would drastically impact both biogeographical and chronological aspects of the group. As some of the characters identified for such systematic assignment seem to have been incorrectly scored and/or have a more widespread distribution amongst Neosauropoda, we revised and discussed them in depth to verify the putative rebbachisaurid affinities of this taxon. The phylogenetic analyses carried out recovered Dzharatitanis as a titanosaur sauropod, most probably related to Lognkosauria. The extra steps needed to force Dzharatitanis within Rebbachisauridae confirms that its titanosaur affinity is not solely the most parsimonious hypothesis but also is well supported when the incompleteness of the material is considered. Given this new phylogenetic position, a new modified diagnosis is provided here. Although more complete evidence is needed, the reinterpretation of Dzharatitanis as a titanosaur with lognkosaurian affinities suggests a wider biogeographic distribution of this group of colossosaurs during the Cretaceous. At present, there is no reliable evidence to assume that rebbachisaurid sauropods have inhabited Asia.
... Además la presencia de las siguientes sinopomorfías caracteriza al nuevo taxón: centros cervicales medios relativamente cortos (longitud total/altura del cótilo < 2,5), profunda y amplia fosa supradiapofisial en vértebras cervicales; relación: altura de la vértebra cervical/longitud del centro > 1,5; procesos transversos cervicales con "forma de ala" en vistas anterior y ventral debido a la presencia de amplias láminas prezigodiapofisiales de borde anterior convexo; lámina prespinal extendida hasta la base de la espina neural en vértebras dorsales anteriores; pleurocelos acuminados en vértebras dorsales anteriores; ausencia de articulación hipósfeno-hipantro en vértebras dorsales anteriores; centros caudales anteriores fuertemente procélicos con cóndilos posteriores prominentes; arcos neurales de las vértebras caudales medias y posteriores ubicados en la mitad anterior de los centros; ángulo ánterodorsal de la espina neural de las caudales medias situado anteriormente con respecto al margen anterior de las postzigapófisis; espinas neurales axialmente elongadas y laminares en vértebras caudales medias; prezigapófisis relativamente largas en vértebras caudales medias; hemapófisis con articulaciones proximales abiertas; placa esternal de contorno semilunar con un borde posterior relativamente recto; borde anterior de la hoja escapular cóncavo en su porción proximal y recto en su porción distal; húmero con un borde proximal relativamente recto que se curva en su extremo medial; metacarpos sin facetas articulares distales; fémur con una protuberancia lateral debajo del trocánter mayor. Paratipos: IANIGLA-PV 066, 067, 068, 069, 070/1-2, 071/1-4, 072, 073/1-2, 074/1-3, 077/1-5, 078, 079, 080/1-2, 081/1-2 (González Riga, 2003). ...
Catalog of type specimens of the Paleontological Collections of Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA), Mendoza, Argentina.The Instituto
Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA) houses five paleontological collections that started their formation in the 1990s. Since then, the information about their type
specimens was dispersed. The aim of this contribution is to present the catalogue of the paleontological type material corresponding to invertebrates, vertebrates, plants, ichnotaxa and
palynomorphs. The type specimens correspond to 5 genera and 31 species published up to now, that were recovered from Paleozoic and Mesozoic sediments of Argentina. For each taxon, data about
systematics, synonymy, diagnosis, identification, status, type locality, stratigraphic origin and derivation of name are provided. Number of holotypes and paratypes in each collection is indicated, as well as some missing specimens.
