Mirusavis

Mirusavis is a genus of Enantiornithes from the early Cretaceous (Aptian – Barremian) of China recovered in the Yixian Formation. It contains a single species, Mirusavis parvus.

Mirusavis Temporal range: Early Cretaceous
Photograph and interpretive drawing of holotype specimen
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia
Clade:	Theropoda
Clade:	Avialae
Clade:	†Enantiornithes
Genus:	†Mirusavis Wang et al., 2020
Species:	†M. parvus
Binomial name
†Mirusavis parvus Wang et al., 2020

Etymology

The genus name Mirusavis comes from the Latin words mirus (unexpected) and words avis (bird), in reference to the unusual discovery of the holotype preserved during the laying cycle. The species name words parvus means "small" in Latin.

Classification

Wang et al. (2020) recovered Mirusavis to be closest related to Shangyang graciles.

Paleobiology

The type and only specimen of Mirusavis was a partial subadult skeleton identified by the lack of ossification that would be seen in a mature individual. Medullary bone tissue was also recovered in the specimen, meaning that the fossil was a female that died during the egg-laying cycle. This find shows that Enantiornithes were unlike modern day birds in that they became reproductively active before completing the ossification of their skeleton.^[1]