I.—On the Discovery of a Secondary Reptile in Madagascar: <i>Steneosaurus Baroni</i> (n. sp.); with a Reference to some Post-Tertiary Vertebrate Remains from the same Country recently acquired by the British Museum (Natural History)

Newton, R. Bullen

doi:10.1017/s0016756800170360

Cited by 15 publications

(16 citation statements)

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“…Marine teleosaurids are generally found in marginal/coastal deposits. Fossils from estuarine or brackish environments, for example in the Late Jurassic of Portugal (Krebs, 1967;1968) or in the Middle Jurassic of Madagascar (Newton, 1893) suggest an ability to shift between habitats, which raises ecological and physiological questions related to salt excretion, migrations, resource use, reproduction or refuge from predators (Martin et al, 2016). The versatile habitat preferences of teleosaurids may have proved selectively advantageous in the context of sea-level and other global environmental changes (Benson and Butler, 2011;Martin et al, 2014a;Tennant et al, 2017), possibly permitting their survival into the Cretaceous, as recently proposed with the report of Machimosaurus in the Hauterivian of Tunisia (Fanti et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Eudes-Deslongchamps, 1870;Andrews, 1909;Westphal, 1962). Outside this range, the known material is badly in need of revision: from East Asia (Young, 1948;Li, 1993;Buffetaut et al, 1994a), Madagascar (Newton, 1893;Buffetaut et al, 1981) and Central Asia (Efimov, 1988;Efimov and Chkhikvadze, 1987;Storrs and Efimov, 2000). The new report of teleosaurids 4 from northeastern Thailand thus improves an otherwise poor record outside Western Tethys.…”

Section: Introductionmentioning

confidence: 99%

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A new freshwater teleosaurid from the Jurassic of northeastern Thailand

Martin

Suteethorn

Lauprasert

et al. 2018

Journal of Vertebrate Paleontology

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The core of the fossil record of Teleosauridae, a family of thalattosuchian crocodylomorphs, is well known from western Tethyan marine deposits of the Jurassic. Outside this province, their fossil record is patchy and in need of revision with specimens from Russia, Madagascar and Asia. Peipehsuchus teleorhinus is known from the Early or Middle Jurassic of China and teleosaurid specimens were mentioned or preliminarily described from two Jurassic localities in Thailand, yet they were not assigned to a given taxon. Thanks to recent fieldwork, at least 10 individuals represented by cranial material were excavated and prepared from a single Jurassic locality known as Phu Noi in the lower Phu Kradung Formation of northeastern Thailand. Here, we describe these specimens together with disarticulated postcranial elements and erect a new taxon, Indosinosuchus potamosiamensis gen. et sp. nov.. Phylogenetic analyses confirm the teleosaurid affinities of the new species, which does not form an exclusive clade with the Chinese teleosaurid Peipehsuchus teleorhinus. The presence of teleosaurids at Phu Noi and a preliminary account of its faunal content favor a Middle to Late Jurassic age for the fossil-bearing horizon. In contrast, Cretaceous deposits in Thailand are characterized by goniopholidids and pholidosaurids indicating a faunal turnover in SE Asia across the Jurassic-Cretaceous. As previously shown by isotope data, the new teleosaurid species was a resident of the freshwater environment and co-occurs with remains of exclusively terrestrial taxa such as sauropod, ornithopod and theropod dinosaurs and other freshwater reptiles such as turtles and temnospondyls.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new freshwater teleosaurid from the Jurassic of northeastern Thailand

Martin

Suteethorn

Lauprasert

et al. 2018

Journal of Vertebrate Paleontology

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“…Description-maxillae ornamented with numerous, weakly-to strongly developed grooves; moderately interdigitating premaxilla-maxilla dorsal suture (shared with Mystriosaurus, Proexochokefalos, Andrianavoay, Neosteneosaurus and Machimosaurini); deep, pronounced reception pits throughout the entirety of the maxilla (shared with Andrianavoay, Neosteneosaurus, and Machimosaurini); at least 27 maxillary alveoli; mainly circular, well-spaced maxillary alveoli throughout the entirety of the rostrum; posterior maxillary alveoli slightly smaller than anterior maxillary alveoli (similar to Yvridiosuchus); well-developed, pronounced enamel ridges near the base of the tooth. (Newton, 1893).…”

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confidence: 99%

“…Currently, only one taxon can hypothetically be referable to S. rostromajor, Neosteneosaurus; however, due to lack of autapomorphic features, uncertainty of teleosauroid ontogenetic and sexual dimorphic stages, a generic concept that has changed multiple times, and poor preservation, S. rostromajor is currently regarded as a nomen dubium(Johnson, Young & Brusatte, 2020).Andrianavoay gen. nov.Type species-Steneosaurus baroni Newton, 1893. Now referred to as Andrianavoay baroni(Newton, 1893), comb. nov. urn:lsid:zoobank.org:act:90C7838E-BE28-4615-BB85-BB04B67F1304 Etymology-'Noble crocodile'.…”

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confidence: 99%

The phylogenetics of Teleosauroidea (Crocodylomorpha, Thalattosuchia) and implications for their ecology and evolution

Johnson

Young

Brusatte

2020

PeerJ

107

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Teleosauroidea was a clade of ancient crocodylomorphs that were a key element of coastal marine environments during the Jurassic. Despite a 300-year research history and a recent renaissance in the study of their morphology and taxonomy, macroevolutionary studies of teleosauroids are currently limited by our poor understanding of their phylogenetic interrelationships. One major problem is the genus Steneosaurus, a wastebasket taxon recovered as paraphyletic or polyphyletic in phylogenetic analyses. We constructed a newly updated phylogenetic data matrix containing 153 taxa (27 teleosauroids, eight of which were newly added) and 502 characters, which we analysed under maximum parsimony using TNT 1.5 (weighted and unweighted analyses) and Bayesian inference using MrBayes v3.2.6 (standard, gamma and variation). The resulting topologies were then analysed to generate comprehensive higher-level phylogenetic hypotheses of teleosauroids and shed light on species-level interrelationships within the clade. The results from our parsimony and Bayesian analyses are largely consistent. Two large subclades within Teleosauroidea are recovered, and they are morphologically, ecologically and biogeographically distinct from one another. Based on comparative anatomical and phylogenetic results, we propose the following major taxonomic revisions to Teleosauroidea: (1) redefining Teleosauridae; (2) introducing one new family and three new subfamilies; (3) the resurrection of three historical genera; and (4) erecting seven new generic names and one new species name. The phylogeny infers that the Laurasian subclade was more phenotypically plastic overall than the Sub-Boreal-Gondwanan subclade. The proposed phylogeny shows that teleosauroids were more diverse than previously thought, in terms of morphology, ecology, dispersal and abundance, and that they represented some of the most successful crocodylomorphs during the Jurassic.

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“…Crocodylomorpha has a long evolutionary history dating back to the Late Triassic, ∼230 mya ( Irmis, Nesbitt & Sues, 2013 ; Zanno et al, 2015 ), and have had a largely global distribution for most of their evolutionary history. The earliest known crocodylomorph fossils on Madagascar date back to the early Jurassic with the teleosaurid Steneosaurus baroni Newton, 1893 . However the Late Cretaceous Maevarano Formation in the Mahajanga Basin ( Buckley et al, 2000 ; Buckley, 2001 ) preserves a very diverse assemblage of notosuchian, mahajangasuchid, and trematochampsid crocodylomorphs that includes Simosuchus clarki Buckley et al, 2000 , Mahajangasuchus insignis Buckley & Brochu, 1999 , Araripesuchus tsangatsangana Turner, 2002, and Miadanasuchus oblita ( Buffetaut & Taquet, 1979 ), ( Buckley et al, 2000 ; Buckley, 2001 ; Krause et al, 2006 ; Rasmusson-Simons & Buckley, 2009 ; Turner, 2006 ; Turner & Sertich, 2010 ).…”

Section: Introductionmentioning

confidence: 99%

A juvenile subfossil crocodylian from Anjohibe Cave, Northwestern Madagascar

Mathews

Samonds

2016

PeerJ

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Madagascar’s subfossil record preserves a diverse community of animals including elephant birds, pygmy hippopotamus, giant lemurs, turtles, crocodiles, bats, rodents, and carnivorans. These fossil accumulations give us a window into the island’s past from 80,000 years ago to a mere few hundred years ago, recording the extinction of some groups and the persistence of others. The crocodylian subfossil record is limited to two taxa, Voay robustus and Crocodylus niloticus, found at sites distributed throughout the island. V. robustus is extinct while C. niloticus is still found on the island today, but whether these two species overlapped temporally, or if Voay was driven to extinction by competing with Crocodylus remains unknown. While their size and presumed behavior was similar to each other, nearly nothing is known about the growth and development of Voay, as the overwhelming majority of fossil specimens represent mature adult individuals. Here we describe a nearly complete juvenile crocodylian specimen from Anjohibe Cave, northwestern Madagascar. The specimen is referred to Crocodylus based on the presence of caviconchal recesses on the medial wall of the maxillae, and to C. niloticus based on the presence of an oval shaped internal choana, lack of rostral ornamentation and a long narrow snout. However, as there are currently no described juvenile specimens of Voay robustus, it is important to recognize that some of the defining characteristics of that genus may have changed through ontogeny. Elements include a nearly complete skull and many postcranial elements (cervical, thoracic, sacral, and caudal vertebrae, pectoral elements, pelvic elements, forelimb and hindlimb elements, osteoderms). Crocodylus niloticus currently inhabits Madagascar but is locally extinct from this particular region; radiometric dating indicates an age of ∼460–310 years before present (BP). This specimen clearly represents a juvenile based on the extremely small size and open sutures/detached neural arches; total body length is estimated to be ∼1.1 m (modern adults of this species range from ∼4–6 m). This fossil represents the only juvenile subfossil crocodylian specimen reported from Madagascar.

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I.—On the Discovery of a Secondary Reptile in Madagascar: Steneosaurus Baroni (n. sp.); with a Reference to some Post-Tertiary Vertebrate Remains from the same Country recently acquired by the British Museum (Natural History)

Cited by 15 publications

References 0 publications

A new freshwater teleosaurid from the Jurassic of northeastern Thailand

A new freshwater teleosaurid from the Jurassic of northeastern Thailand

The phylogenetics of Teleosauroidea (Crocodylomorpha, Thalattosuchia) and implications for their ecology and evolution

A juvenile subfossil crocodylian from Anjohibe Cave, Northwestern Madagascar

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