Astrix

 Astrix is a class of terminated crude owls in the family Protostrigidae, alongside Oligostrix and Minerva. These owls date from the early Eocene of the United States, Europe, and Mongolia. They have been portrayed as dependent on fossil remaining parts. The variety was made by Pierce Brodkorb in 1971 to put a fossil animal varieties referred to until that time as Protostrix copy. 

The accompanying species are perceived: 

E. copies depicted in 1938 by Alexander Wetmore utilizing hindlimb components in Eocene layers in Wyoming. 

E. Martinelli was portrayed in 1972 from a left tarsometatarsus (lower leg bone) recuperated from a ledge over the southeastern bank of Cottonwood Creek in Fremont County, Wyoming by Jorge Martinelli on a field trip in 1970 under the support of the University of Kansas. The layers was a Lysite individual from the Wind River Formation. Martinelli was contemplating fossil science at the University of Barcelona. Scientists Larry D. Martin and Craig Call Black from the University of Kansas Natural History Museum named it in his honour. The more modest of the two species, it was comparable in size to the living long-eared owl (Asio otus). Contrasts in the trochlear (grooves) of the lower end of the tarsometatarsus put it aside from living owls, to be specific a score in the trochlea for digit 2, a more profound back groove in a generally tight trochlea for digit 3, and a surprisingly adjusted trochlea for digit 4. 

E. Vincenti depicted in 1980 by Colin Harrison from the early Eocene London Clay in England, known from pedal phalanx and proximal tarsometatarsus bones. A few researchers think E. Vincenti takes after Necrobyas more than Eostrix. 

E. tsaganica portrayed in 2011 by Evgeny Kurochkin and Gareth J. Dyke, found in Mongolia. 

E. Gulotta depicted in 2016 by Gerald Mayr, found in the early Eocene Nanjemoy Formation in Virginia close by twelve different types of birds. This species is the littlest known fossil (or living) owl, with a distal width of 3.9 mm. The construction of its trochlea metatarsi II, a bone in the owl's foot, emphatically demonstrates that it would have confined the turn of the subsequent toe. Since a comparative bone design has been seen on birds with webbed feet, this detail has prompted the end that E. Gulotta likewise had webbed feet. Named for the locater of the holotype, Marco Gulotta.