Eostrix is a genus of extinct primitive owls in the family Protostrigidae, along with Oligostrix and Minerva. These owls date from the early Eocene of the United States, Europe, and Mongolia. They have been described based on fossil remains. The genus was created by Pierce Brodkorb in 1971 to place a fossil species known until that time as Protostrix mimica. The following species are recognised:
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| - Eostrix (en)
- Eostrix (es)
- Eostrix (uk)
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| - Eostrix — викопний рід ранніх совоподібних птахів вимерлої родини Protostrigidae, що існував в ранньому еоцені. Рештки представників роду знайдено в США, Європі та Монголії. (uk)
- Eostrix is a genus of extinct primitive owls in the family Protostrigidae, along with Oligostrix and Minerva. These owls date from the early Eocene of the United States, Europe, and Mongolia. They have been described based on fossil remains. The genus was created by Pierce Brodkorb in 1971 to place a fossil species known until that time as Protostrix mimica. The following species are recognised: (en)
- Eostrix es un género extinto de ave estrigiforme perteneciente a la familia , que vivió a principios del Eoceno en Wyoming, Estados Unidos y en la Arcilla de Londres en Inglaterra. Fue nombrado por Pierce Brodkorb en 1971 para situar a una especie extinta conocida hasta entonces como Protostrix mimica. (es)
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| - E. gulottai (Mayr 2016) (en)
- E. martinellii (Martin & Black, 1972) (en)
- E. mimica (en)
- E. tsaganica (Kurochkin& Dyke 2011) (en)
- E. vincenti (Harrison 1980) (en)
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| - Eostrix is a genus of extinct primitive owls in the family Protostrigidae, along with Oligostrix and Minerva. These owls date from the early Eocene of the United States, Europe, and Mongolia. They have been described based on fossil remains. The genus was created by Pierce Brodkorb in 1971 to place a fossil species known until that time as Protostrix mimica. The following species are recognised:
* E. mimica described in 1938 by Alexander Wetmore using hindlimb elements in Eocene strata in Wyoming.
* E. martinellii was described in 1972 from a left tarsometatarsus (lower leg bone) recovered from an escarpment above the southeastern bank of Cottonwood Creek in Fremont County, Wyoming by Jorge Martinelli on a field trip in 1970 under the auspices of the University of Kansas. The strata was a Lysite member of the Wind River Formation. Martinelli was studying paleontology at the University of Barcelona. Paleontologists Larry D. Martin and Craig Call Black from the University of Kansas Natural History Museum named it in his honour. The smaller of the two species, it was similar in size to the living long-eared owl (Asio otus). Differences in the trochleas (grooves) of the lower end of the tarsometatarsus set it apart from living owls, namely a groove in the trochlea for digit 2, a deeper posterior groove in a relatively narrow trochlea for digit 3, and an unusually rounded trochlea for digit 4.
* E. vincenti described in 1980 by Colin Harrison from the early Eocene London Clay in England, known from pedal phalanx and proximal tarsometatarsus bones. Some scholars think E. vincenti resembles more than Eostrix.
* E. tsaganica described in 2011 by Evgeny Kurochkin and Gareth J. Dyke, found in Mongolia.
* E. gulottai described in 2016 by Gerald Mayr, found in the early Eocene Nanjemoy Formation in Virginia alongside a dozen other species of birds. This species is the smallest known fossil (or living) owl, with a distal tarsometatarsus width of 3.9 mm. It was named for the finder of the holotype, . (en)
- Eostrix es un género extinto de ave estrigiforme perteneciente a la familia , que vivió a principios del Eoceno en Wyoming, Estados Unidos y en la Arcilla de Londres en Inglaterra. Fue nombrado por Pierce Brodkorb en 1971 para situar a una especie extinta conocida hasta entonces como Protostrix mimica. Se reconocen dos especies. E. martinellii fue descrita en 1972 a partir de un tarsometatarso izquierdo (hueso de la parte inferior de la pata) recuperado de un acantilado sobre el banco sureste de Cottonwood Creek en el condado de Fremont (Wyoming) por Jorge Martinelli durante una salida de campo en 1970 bajo el auspicio de la Universidad de Kansas. Los estratos en cuestión eran parte del Miembro Lysite de la . Martinelli estaba estudiando paleontología en la Universidad de Barcelona. Los paleontólogos Larry D. Martin y Craig C. Black del Museo de Historia Natural nombraron en su honor a la especie. Esta es la menor de las dos especies, siendo similar en tamaño al actual búho chico (Asio otus). Diferencias en las trócleas (surcos) del extremo inferior del tarsometatarso lo apartan de los búhos actuales, más precisamente un surco en la tróclea del segundo dígito, un surco posterior más profundo en una tróclea relativamente estrecha en el tercer dígito, y una tróclea inusualmente redondeada para el cuarto dígito. (es)
- Eostrix — викопний рід ранніх совоподібних птахів вимерлої родини Protostrigidae, що існував в ранньому еоцені. Рештки представників роду знайдено в США, Європі та Монголії. (uk)
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