Lectavis
{{Short description|Extinct genus of birds}}
{{Italic title}}
{{speciesbox
| name = Lectavis
| image = Lectavis bretincola reconstruction by Lauren Helton.jpg
| image_caption = Restoration of Lectavis bretincola predating upon a hermit crab
| fossil_range = Maastrichtian
~{{fossilrange|70|68}}
| genus = Lectavis
| parent_authority = Chiappe 1993
| species = bretincola
| authority = Chiappe 1993
}}
Lectavis is a genus of enantiornithine avialan. Their fossil bones have been recovered from the Late Cretaceous (Maastrichtian, c. 70.6 – 66 mya) Lecho Formation at estancia El Brete, Argentina. The genus contains a single species, Lectavis bretincola.
Etymology
It's naming means "Lecho Formation bird living at El Brete". Lectavis, after Latin lectus ("bed") = Spanish lecho + Latin avis, "bird". bretincola, after the type locality estancia El Brete + Latin incola, "inhabitant".
Description
The presently only known fossil bones (PVL-4021-1) are mostly of the left tibiotarsus (lower leg) and tarsometatarsus (upper foot) of a single individual. L. bretincola was a sizeable bird, with a {{convert|16|cm|adj=on}} tibiotarsus and a tarsometatarsus which if complete must have been nearly {{convert|10|cm|in}} long (Chiappe 1993). This remains indicate an animal with a length of {{cvt|41|cm}}, hip height of {{cvt|30|cm}}, and weight of {{cvt|1.15|kg|lb}}.{{cite book
| isbn = 9780691190594
| url = https://books.google.com/books?id=WnZyDwAAQBAJ&dq=avisaurus+size&pg=PA281
| title = Dinosaur Facts and Figures: The Theropods and Other Dinosauriformes
| publisher = Princeton University Press
| date = June 25, 2019
| access-date = 29 August 2022
| pages = 281
| author = Rubén Molina-Pérez, Asier Larramendi, David Connolly, Gonzalo Ángel Ramírez Cruz, Andrey Atuchin
}}
It possesses a hypotarsus, which it evolved autapomorphically from modern birds, as it covers the upper end of the second, not the third, toe's bones. This structure serves to attach and arrest the posterior cruciate ligament, which in turn prevents the lower and upper leg from shifting out of position during walking.
Classification
It was a rather advanced species of enantiornithine and possibly quite closely related to Enantiornis and Avisaurus, but more likely closer to other Euenantiornithes (Sanz et al. 1995). Its exact relationships, as with most enantiornithine birds, are unresolved however.
Paleoecology
It appears that L. bretincola was a much more terrestrial species than its relative Yungavolucris brevipedalis which lived at the same time and place. Its habitat was a richly vegetated coastal area that was dotted by – possibly brackish – lakes or small rivers (Chiappe 1993), and it might thus be that the present species represents a case of parallel evolution with waders and similar semi-aquatic forms, or even a running bird similar to an oversized courser, and quite unlike anything living today.
References
{{reflist}}
= Bibliography =
- Chiappe, Luis M. (1993): Enantiornithine (Aves) Tarsometatarsi from the Cretaceous Lecho Formation of Northwestern Argentina. American Museum Novitates 3083: 1-27. [English with Spanish abstract] [http://digitallibrary.amnh.org/dspace/bitstream/2246/4981/1/N3083.pdf PDF fulltext]
- Sanz, José L., Chiappe, Luis M. & Buscalioni, Angela D. (1995): The Osteology of Concornis lacustris (Aves: Enantiornithes) from the Lower Cretaceous of Spain and a Reexamination of its Phylogenetic Relationships. American Museum Novitates 3133: 1-23. [English with Spanish abstract] [http://digitallibrary.amnh.org/dspace/bitstream/2246/3667/1/N3133.pdf PDF fulltext]
{{Enantiornithes}}
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Category:Cretaceous birds of South America
Category:Fossil taxa described in 1993
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