Triassic Spinicaudatan Fauna from the Cerro de Las Cabras Formation (Cuyo Basin), Mendoza Province (Argentina): Description of New Species and Revision of Previous Records

Tassi, Lara Vaz; Zavattieri, Ana Marı́a; Gallego, Oscar Florencio

doi:10.5710/amgh.29.11.2014.2823

Cited by 12 publications

(9 citation statements)

References 18 publications

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“…Calaichthys was collected in facies dominated by finely laminated grey‐greenish to dark grey carbonaceous siltstones and claystones associated with conchostracans referred to Euestheria martinsnetoi (Vaz Tassi et al . ) and plant remains related to a ‘ Dicroidum Flora’ (Cariglino et al . ).…”

Section: Discussionmentioning

confidence: 99%

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Increasing the fish diversity of the Triassic faunas of Gondwana: a new redfieldiiform (Actinopterygii) from the Middle Triassic of Argentina and its palaeobiogeographical implications

Gouiric-Cavalli

Zavattieri

Gutiérrez

et al. 2017

Papers in Palaeontology

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A new actinopterygian, Calaichthys tehul gen. et sp. nov. is described on the basis of a few, well-preserved specimens from the Anisian Cerro de Las Cabras Formation, Cuyo Basin in Mendoza Province. The new genus shows a combination of primitive characters (e.g. deep posterior region of the maxilla contacting the preopercle, a suspensorium backwardly oriented) and more advanced characters (e.g. distally segmented fin rays, hemiheterocercal caudal fin) and is thus considered to be a 'subholostean' fish. The new taxon is assigned to Redfieldiiformes on the basis of its single branchiostegal plate-like ray, a median gular plate, pectoral fins with stout, stiff, mainly non-segmented and distally branched fin rays, long and robust fringing fulcra in all fins, basal fulcra bordering both lobes of the caudal fin, and opposite dorsal and anal fins. Calaichthys is characterized by a combination of characters some of which are unique among redfieldiiforms (i.e. strongly ornamented but thin scales with a serrated posterior margin, smooth skull roof bones, extrascapulars with a bifid posterior margin, three suborbital bones, a hatchet-shaped preopercle, rectangular and slender opercle, deep mouth gape, entopterygoid and ectopterygoid with small pointed teeth disposed in several series, unornamented rostral bone, massive pectoral fins and delicate dorsal, pelvic and anal fins). Calaichthys provides novel information about the anatomy of redfieldiiforms, in particular in relation with the fins and associated scaly elements, as well as the scale morphology and their disposition over the body. Our work confirms for the first time that redfieldiiforms occur in South America. Redfieldiiforms seem to have originated in Gondwana and shown two diversity peaks: in the Anisian and the Carnian. Calaichthys is coeval with those redfieldiiforms of the Middle Triassic (Anisian) of Africa and Australia dwelling in ephemeral lakes.

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Section: Discussionmentioning

confidence: 99%

“…The associated spinacaudatan assemblages were assigned to Euestheria martinsnetoi (Vaz Tassi et al . ).…”

Section: Geological Settingmentioning

confidence: 97%

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Increasing the fish diversity of the Triassic faunas of Gondwana: a new redfieldiiform (Actinopterygii) from the Middle Triassic of Argentina and its palaeobiogeographical implications

Gouiric-Cavalli

Zavattieri

Gutiérrez

et al. 2017

Papers in Palaeontology

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“…Ostracod specimens herein described are associated with the spinicaudatan Euestheria menendezii Vaz Tassi et al ., 2015 in calcareous strata of the shallow lacustrine–palustrine beds of the profile, represented by the facies of mottled–nodular limestones and stromatolitic limestones. This invertebrate assemblage suggests autochthonous species inhabiting a low‐energy stable shallow lacustrine environment, as indicated by the presence of several limestone beds colonized by huge amounts (blooms) of algae inducing precipitation of carbonates (Vaz Tassi et al .…”

Section: Geological Settingmentioning

confidence: 99%

Evaluation of the ontogeny and sexual dimorphism in a new species of Middle Triassic Darwinulocopina (Crustacea, Ostracoda) from Argentina

Carignano

Echevarría

Zavattieri

2020

Papers in Palaeontology

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Darwinulocopina is an interesting group of ostracods that includes some of the first invaders of freshwater habitats during the late Palaeozoic. The Permian-Triassic extinction greatly reduced their diversity, culminating in a single extant family. The darwinulids are regarded as 'ancient asexuals' given that a parthenogenetic mode of reproduction is assumed for all post-Triassic members of the group. However, the high diversity achieved during the late Palaeozoic is often associated with sexual reproduction. Here we studied a monospecific assemblage of ostracods from the Middle Triassic of the Cuyo Basin, Province of Mendoza, Argentina, recognizing a new species of Darwinulocopina, Prasuchonella? huarpe sp. nov. We discuss the traditional length/height and length/width graphical method for identifying ontogeny/sexual dimorphism in fossil ostracod assemblages. A geometric morphometric analysis was performed on both lateral and dorsal views of almost 170 carapaces, to evaluate the ontogeny and sexual dimorphism of the species. The best results were obtained from the analysis in dorsal view, discriminating four ontogenetic stages. This revealed a main ontogenetic trend related to the development of the brooding chamber. Although subtle in difference, female carapaces are wider not only at the brooding chamber, but also along the whole length, compared with the presumptive males. We provide full systematic descriptions and discussions, attempting to unify descriptive criteria for recent and fossil darwinulocopine carapaces, and suggest closeness to species previously described from the upper Permian of Russia. As a result, we recommend a review of Mesozoic records of Darwinulocopina, particularly those from the Triassic.

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“…The highest diversity of continental fossil invertebrates from the Argentinean Triassic sequences derives mainly from two basins: (1) the Ischigualasto-Villa Unión Basin (= Bermejo Basin) in La Rioja and San Juan provinces, and (2) the Cuyana Basin (= Cuyo Basin) in Mendoza and San Juan provinces. In these basins, the most common and best-studied fossil invertebrates comprise the insects, with 87 described species (Martins-Neto et al, 2003, 2005, 2006a, b, 2007, 2008; Martins-Neto and Gallego, 2009; Gallego et al, 2011; Lara and Lukashevich, 2013; Lara et al, 2014, 2015, 2017; Lara, 2016; Lara and Aristov, 2016; Lara and Wang, 2016), and the spinicaudatans, with 30 described species (Rusconi, 1946a, b, 1947, 1948a, b; Tasch, 1987; Gallego, 1992, 1999, 2005; Camacho, 1995; Shen et al, 2001; Gallego et al, 2004; Tassi et al, 2013, 2015; Tassi, 2016).…”

Section: Introductionmentioning

confidence: 99%

An enigmatic Arthropoda from the Upper Triassic (Carnian) southwestern Gondwana (Argentina)

Lara

Cariglino²,

Zavattieri³

et al. 2019

J. Paleontol.

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The presence of a new taxon, Duraznovis gallegoi new genus new species is reported and described from an early Late Triassic (Carnian) deposit in Argentina. Two specimens, recovered from the Quebrada del Durazno locality, uppermost levels of the Potrerillos Formation, Cuyana Basin (Mendoza), are represented by the molds of their shield and imprints of soft parts. The identity of these specimens appears enigmatic but closely resembles in the possession of a generalized arthropod morphology and a distinctive combination of characters, to living and fossil representatives of xiphosurans (Chelicerata) and notostracans (Branchiopoda). The new fossils are associated with a rich biota comprising abundant insects, spinicaudatans, plants, and scarce fish remains living in semipermanent swamps and/or ponds within a delta plain environment with intermittent episodes of flooding, in a warm temperate and humid megamonsoonal climate during Triassic times. In this context, we analyze the taphonomic and ecological implications of their presence. Lastly, these unique specimens at the Quebrada del Durazno locality adds to the diversity of the biota, revealing the importance of this site as an exceptional paleontological Triassic deposit.UUID: http://zoobank.org/8d1194c2-170c-4b7a-b0c6-5c08b0974d95

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Triassic Spinicaudatan Fauna from the Cerro de Las Cabras Formation (Cuyo Basin), Mendoza Province (Argentina): Description of New Species and Revision of Previous Records

Cited by 12 publications

References 18 publications

Increasing the fish diversity of the Triassic faunas of Gondwana: a new redfieldiiform (Actinopterygii) from the Middle Triassic of Argentina and its palaeobiogeographical implications

Increasing the fish diversity of the Triassic faunas of Gondwana: a new redfieldiiform (Actinopterygii) from the Middle Triassic of Argentina and its palaeobiogeographical implications

Evaluation of the ontogeny and sexual dimorphism in a new species of Middle Triassic Darwinulocopina (Crustacea, Ostracoda) from Argentina

An enigmatic Arthropoda from the Upper Triassic (Carnian) southwestern Gondwana (Argentina)

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