Freshwater actinopterygians of the Los Rastros Formation (Triassic), Bermejo Basin, Argentina

López‐Arbarello, Adriana; Rogers, Raymond R.; Puerta, Pablo

doi:10.1002/mmng.200600011

Cited by 17 publications

(20 citation statements)

References 21 publications

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“…In the Ischigualasto-Villa Unión Basin in northwestern Argentina, thick Middle Triassic lacustrine/deltaic deposits of the Ischichuca/Los Rastros Formation have been extensively studied, with more recent work focusing on its body fossil content and taphonomy (Mancuso, 2003(Mancuso, , 2005Melchor, 2004;Ottone et al, 2005;Martins-Neto et al, 2005, 2006López-Arbarello et al, 2006;Ottone and Mancuso, 2006;Mancuso and Marsicano, 2008). The tetrapod record of the succession is almost exclusively composed of tracks and trackways, as the whole column is virtually devoid of tetrapod bone remains.…”

Section: Introductionmentioning

confidence: 97%

Tetrapod tracks in a marginal lacustrine setting (Middle Triassic, Argentina): Taphonomy and significance

Marsicano

Mancuso

Palma

et al. 2010

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Introductionmentioning

confidence: 97%

Tetrapod tracks in a marginal lacustrine setting (Middle Triassic, Argentina): Taphonomy and significance

Marsicano

Mancuso

Palma

et al. 2010

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…T riassic fishes from South America are still very poorly known, although a total of 30 species have been proposed (Gallego et al. 2004; López‐Arbarello 2004; López‐Arbarello et al. 2006).…”

mentioning

confidence: 99%

“…The continental Triassic deposits of the Cuyana and Del Bermejo basins have yielded important vertebrate faunas. The fish fauna of the Del Bermejo Basin was recently revised (López‐Arbarello et al. 2006), but little work has been done on the ichthyofaunas of the Cuyana Basin in recent decades (Breglia 2000; Gallego et al.…”

mentioning

confidence: 99%

SYSTEMATIC REVISION OF PSEUDOBEACONIA BORDAS, 1944, AND MENDOCINICHTHYS WHITLEY, 1953 (ACTINOPTERYGII: ‘PERLEIDIFORMES’) FROM THE TRIASSIC OF ARGENTINA

López‐Arbarello¹,

Zavattieri²

2008

Palaeontology

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Abstract:The 'perleidiform' Mendocinichthys and Pseudobeaconia from the Potrerillos and Santa Clara Abajo formations (Upper Triassic; Argentina) are reviewed. Mendocinichthys has been known from a review of this species that is not based on the type material, but on referred specimens in the American Museum of Natural History. However, those specimens are found here to represent a new species of Pseudobeaconia, P. celestae sp. nov. Consequently, Mendocinichthys is restricted here to the type material and, within it, to the only specimen that clearly represents a distinct taxon and is thus designated lectotype. We further performed a cladistic analysis and propose a new family, Pseudobeaconiidae for these two South American Triassic genera, which is mainly characterized by the presence of an incomplete dorsal ridge of spine-like scales between the skull and the dorsal fin, and scales with straight posterior border, an elevated central region and marginal concentric ridges of ganoine. The cladistic analysis further indicates the existence of some lineages endemic to certain areas of Gondwana and Europe. Pseudobeaconia celestae sp. nov. represents the first record of Pseudobeaconia in the Cacheuta sub-basin of the Cuyana Basin. The genus was previously known from the Santa Clara sub-basin of the Cuyana Basin only, and the new record confirms the previous hypothesis of correlation between the sedimentary infilling of these sub-basins. The Cuyana Basin, with c. 60,000 km 2 of fluvio-lacustrine Triassic sediments and a rich fossil flora and fauna, constitutes one of the most important records of the continental life on Earth during that period of biological revolution. Within the Cuyana Basin, mainly the extensive outcrops of the Uspallata Group have yielded abundant vertebrate remains. With the exception of the Río Blanco Formation, fish remains are known from all of the units of the Uspallata Group, with a total of 26 fish species having been named (Ló pez-Arbarello 2004). However, the taxonomy of many of these taxa is problematic. Most of them are based on poorly preserved or even undiagnostic material. Therefore, a taxonomic revision of these faunas [Palaeontology, Vol. 51, Part 5, 2008, pp. 1025-1052 is necessary and essential towards a better understanding of the evolution of basal actinopterygians in Gondwana. Only three species from the Triassic of South America have received some attention in the literature on basal actinopterygian systematic and phylogeny (Hutchinson 1973a, b; Gardiner and Schaeffer 1989): Mendocinichthys brevis (Bordas, 1944), Pseudobeaconia bracaccinii Bordas, 1944, and P. elegans Bordas, 1944. Bordas (1944 created the taxon Mendocinia brevis for two specimens from lacustrine sediments of the Potrerillos Formation (Upper Triassic) of the Cuyana Basin, Argentina. Whitley (1953) recognized that the genus name Mendocinia was preoccupied by a hemipteran and replaced it with Mendocinichthys. Schaeffer (1955) studied several specimens in the American Museum of Natural History, New York, fro...

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“…Although a single branchiostegal ray is not a unique character of redfieldiiforms, being also present in other actinopterygians (Westoll ; Poplin , ; López‐Arbarello et al . ), the combination of characters showed by Calaichthys does not allow its inclusion within any of these actinopterygian groups. Among redfieldiiforms we consider Calaichthys tehul to be a new taxon given its unique combination of characters (see Diagnosis above).…”

Section: Discussionmentioning

confidence: 92%

“…Bordas ; Cabrera ; Rusconi 1946a; López‐Arbarello et al . ; López‐Arbarello & Zavattieri ; Johns et al . ; Gouiric‐Cavalli et al .…”

Section: Discussionunclassified

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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Freshwater actinopterygians of the Los Rastros Formation (Triassic), Bermejo Basin, Argentina

Cited by 17 publications

References 21 publications

Tetrapod tracks in a marginal lacustrine setting (Middle Triassic, Argentina): Taphonomy and significance

Tetrapod tracks in a marginal lacustrine setting (Middle Triassic, Argentina): Taphonomy and significance

SYSTEMATIC REVISION OF PSEUDOBEACONIA BORDAS, 1944, AND MENDOCINICHTHYS WHITLEY, 1953 (ACTINOPTERYGII: ‘PERLEIDIFORMES’) FROM THE TRIASSIC OF ARGENTINA

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

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