List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Amphibia
- Temnospondyli
- Rhytidosteidae
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Lyrosaurus australis
Lehman 1966
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Maganuco et al. 2014 | |||||||||
| synonym of Mahavisaurus dentatus | ||||||||||
| MNHN MAE3050, partial skull | ||||||||||
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Reptilia
- Procolophonidae
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Eosuchia indet.
(Broom 1914)
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Lehman 1966 | 1 individual | ||||||||
| MNHN.F.MAE 3039, relatively complete skeleton preserving the skull, mandible, hyoid apparatus, and presacral region | ||||||||||
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= Lasasaurus beltanae n. gen., n. sp.
Falconnet et al. 2012
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Falconnet et al. 2012 | |||||||||
| see common names | ||||||||||
Geography
| Country: | Madagascar | State/province: | Diana | County: | Ambilobe |
| Coordinates: | 13.3° South, 49.1° East (view map) | ||||
| Paleocoordinates: | 44.4° South, 41.7° East | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Stratigraphy
| Geological group: | Sakamena | Formation: | Middle Sakamena | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: "All previously described tetrapod specimens from the Diego Basin have been collected from the 'Couches à Poissons et Ammonites' (Besairie 1971) suggesting that the material described herein also pertains to this horizon, though this cannot be stated with absolute certainty." The "Couches à Poissons et Ammonites" are equivalent to the Middle Sakamena Formation of the Morondava Basin. "Biostratigraphical correlations based on ammonite faunas indicate referral of the 'Couches à Poissons et Ammonites' to the local Gyronitien Stage (Besairie 1971), which is equivalent to the Induan Stage of the Lower Triassic. This conclusion is supported by comparisons between the vertebrate faunas of Madagascar and the African mainland, which suggest that the Middle Sakamena Formation is intermediate in age between the Lystrosaurus and Cynognathus Assemblage Zones (Battail et al. 1987). Palynological data is also consistent with these interpretations (Wescott and Diggens 1998)." (Ketchum & Barrett, 2004. Canadian Journal of Earth Sciences 41:1-8).
"The presence of Magniestheria truempyi in the same formation (Shen et al., 2002) indicates an Early Smithian (Olenekian, Early Triassic) age by correlation with the well-constrained Triassic strata of the Germanic Basin (Kozur and Weems, 2010)." (Falconnet et al. 2010. Comptes Rendus Palevol 11:357-369) Given the conflicting suggestions of an Induan or early Olenekian age, an Induan–Smithian range is given here. | |||||
Lithology and environment
| Primary lithology: | nodular "siliciclastic" |
| Includes fossils? | Y |
| Lithology description: fossil is preserved in a ferrocalcareous nodule | |
| Environment: | deltaic indet. |
| Geology comments: "The palaeoenvironment was probably deltaic and under tidal influence." | |
Taphonomy
| Modes of preservation: | mold/impression,concretion |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | good |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | MNHN |
Metadata
| Also known as: | Ambondipo | ||
| Database number: | 144094 | ||
| Authorizer: | R. Butler, A. Dunhill | Enterer: | R. Butler, B. Allen |
| Modifier: | B. Allen | Research group: | vertebrate |
| Created: | 2013-04-30 19:48:18 | Last modified: | 2018-09-21 05:11:53 |
| Access level: | the public | Released: | 2013-04-30 19:48:18 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 46591. | J. Falconnet, M. Andriamihaja, Läng and J. S. Steyer. 2012. First procolophonid (Reptilia, Parareptilia) from the Lower Triassic of Madagascar. Comptes Rendus Palevol 11:357-369 [R. Butler/R. Butler/R. Butler] |
Secondary references:
| 46587 | J.-P. Lehman. 1966. Nouveaux Stégocéphales de Madagascar. Annales de Paléontologie (Vertébrés) 52:117-139 [R. Butler/R. Butler] | |
| 66848 | S. Maganuco, G. Pasini, and M. Auditore. 2014. A revision of the short-faced stereospondyls Mahavisaurus dentatus and Lyrosaurus australisfrom the Lower Triassic of Madagascar: cranial anatomy, ontogenetic remarks, palaeoecology and rhytidosteid phylogeny. Memorie della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano 39:1-64 [A. Dunhill/B. Allen] |