North Korea. It may not be a member of Enantiornithes. Liaoxiornis delicatus: Described in 1999 from a specimen of Enantiornithes found in the Yixian Formation. This specimen was originally considered to be a tiny adult, but later found to be a hatchling. Other specimens have henceforth been assigned to the genus. Due to a lack of distinguishing feature, many paleontologists have considered this genus an undiagnostic nomen dubium. "Wasaibpanchi": A supposed member of Enantiornithes from Pakistan; the describing paper is of dubious status. LP-4450: A juvenile of an indeterminate specimen of Enantiornithes from the El Montsec Formation of Spain. Its 2006 description studied the histology of the skeleton, while later studies reported a squamosal bone present in the specimen but unknown in other Enantiornithes. IVPP V 13939: Briefly described in 2004, this Yixian Enantiornithes specimen had advanced pennaceous feathers on its legs, similar to (albeit shorter than) those of other paravians such as Microraptor and Anchiornis. DIP-V-15100 and DIP-V-15101: Two different wings from hatchling specimens which were described in 2015. They attracted a significant amount of media attention upon their description. They were preserved in exceptional details due to having been trapped within Burmese amber for approximately 99 million years. HPG-15-1: A partial corpse of an Enantiornithes hatchling also preserved in Burmese amber. Although indeterminate, it attracted even more media attention than the two wings upon its description in 2017. CUGB P1202: An indeterminate juvenile bohaiornithid from the Jiufotang Formation. A 2016 analysis of its feathering found elongated putative melanosomes, suggesting that a large portion of its feathering was iridescent. DIP-V-15102: Another corpse of an indeterminate hatchling preserved in Burmese amber. Described in early 2018. MPCM-LH-26189 a/b: A partial skeleton of a hatchling from Las Hoyas in Spain, including both slab and counter-slab components. Its 2018 description revealed how various features developed in Enantiornithes as they aged. Such features include the ossification of the sternum from various smaller bones, and the fusion of tail vertebrae into a pygostyle. References External links Cretaceous birds Early Cretaceous first appearances Maastrichtian extinctions