Biology:Alickmeron
Alickmeron ("Alick's femur") is a proposed extinct genus of lagerpetid pterosauromorphs from the Late Triassic (Carnian–Norian ages) Lower Maleri Formation of India. The type species is Alickmeron maleriensis.
Discovery and naming
In 1987, Sankar Chatterjee named Walkeria (later renamed Alwalkeria)[1] maleriensis as a new podokesaurid theropod dinosaur based on a partial skull, 28 incomplete vertebrae from all parts of the spinal column, a proximal left femur and distal right femur, and an astragalus (ankle bone). The bones were collected in the Godavari Valley locality from the Lower Maleri Formation of Andhra Pradesh, India by Chatterjee in 1974, and are housed in the collection of the Indian Statistical Institute, in Kolkata, India.[2]
Later research indicated that the originally-proposed hypodigm is chimeric, with the skull bones belonging to a member of the Crocodylomorpha. Lecuona and colleagues (2016) claimed the distal femur was more consistent with the morphology of pseudosuchians, leading them to identify this bone fragment as an indeterminate representative of that clade.[3]
In 2025, Sen & Ray affirmed the chimeric status of the specimen and claimed the femora could be described as a new genus of lagerpetid pterosauromorphs, which they named Alickmeron, honoring British paleontologist Alick Walker.[4] The specific name, which is taken from Alwalkeria maleriensis, references the Lower Maleri Formation, in southern India, where the fossil material was found.[2]
Classification
Sen & Ray (2025) performed two phylogenetic analyses to test the position of Alickmeron. Using the dataset of Mestriner et al. (2023),[5] they recovered Alickmeron as a member of the Lagerpetidae, as the sister taxon to a clade formed by Venetoraptor and Kongonaphon. A cladogram adapted from this analysis is shown below:[4]
| Lagerpetidae |
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References
- ↑ Chatterjee, S. & Creisler, B.S. 1994. Alwalkeria (Theropoda) and Morturneria (Plesiosauria), new names for preoccupied Walkeria Chatterjee, 1987, and Turneria Chatterjee and Small, 1989. Journal of Vertebrate Paleontology 14(1): 142.
- ↑ 2.0 2.1 Chatterjee, S. 1987. A new theropod dinosaur from India with remarks on the Gondwana-Laurasia connection in the Late Cretaceous. In: McKenzie, G.D. (Ed.). Gondwana Six: Stratigraphy, Sedimentology, and Paleontology. Geophysical Monograph 41. Washington, D.C.: American Geophysical Union. Pp. 183–189.
- ↑ Lecuona, Agustina; Ezcurra, Martín D.; Irmis, Randall B. (2016-10-03). Angielczyk, Kenneth. ed. "Revision of the early crocodylomorph Trialestes romeri (Archosauria, Suchia) from the lower Upper Triassic Ischigualasto Formation of Argentina: one of the oldest-known crocodylomorphs" (in en). Papers in Palaeontology 2 (4): 585–622. doi:10.1002/spp2.1056. ISSN 2056-2799. Bibcode: 2016PPal....2..585L.
- ↑ 4.0 4.1 Sen, Sulagna; Ray, Sanghamitra (2025). "Taxonomic reassessment of archosaurs with dinosaurian affinities from the lower fauna of the Upper Triassic Maleri Formation of India and their significance". Journal of Vertebrate Paleontology. doi:10.1080/02724634.2025.2546434.
- ↑ Mestriner, G.; Marsola, J. C. A.; Nesbitt, S. J.; Da-Rosa, Á. A. S.; Langer, M. (2023). "Anatomy and phylogenetic affinities of a new silesaurid assemblage from the Carnian beds of south Brazil". Journal of Vertebrate Paleontology 43 (1): e2232426. doi:10.1080/02724634.2023.2232426. Bibcode: 2023JVPal..43E2426M.
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