Feitianius paradisi
- 演化之聲
- Mar 23
- 2 min read
Updated: 1 day ago
Age
Cretaceous（Aptian）
122 Ma
Taxonomy
Kingdom：Animalia
Phylum：Chordata
Class：Sauropsida
Order：Saurischia
Genus：Feitianius
Species：Feitianius paradisi
Morphological description
Feitianius paradisi is a small enantiornithine bird, with a femur length of 27 mm, indicating a very small body size. The pygostyle is well developed, featuring a craniodorsal fork, ventrolateral processes, and a distally constricted end.
The abdomen and proximal tail are covered with short downy feathers. Soft tissue remains are preserved around the base of the tail, forming a fleshy structure comparable to the “parson’s nose” in modern birds, from which the tail feathers extend.
The tail plumage exhibits three distinct morphotypes, none of which appear to have had a significant aerodynamic function:
Morphotype A: Feathers 40–45 mm in length, with vanes covering approximately 55% of the distal portion of the rachis.
Morphotype B: Feathers approximately 18 mm long and about half the width of morphotype A, with vanes extending along the entire length of the rachis.
Both morphotypes A and B are pennaceous and slightly curved ventrally.
Morphotype C: Represented only by a single preserved rachis, which is very long, with its distal end missing. This feather is interpreted as part of a pair of elongated central streamers likely used for display.
The describing authors suggested that these elongate feathers had a display function, indicating that the holotype likely represents a male individual. Additionally, morphotypes A and B may have formed a tuft of differently colored feathers at the base of the tail. The overall tail morphology may have resembled that of the extant greater bird-of-paradise (Paradisaea apoda).
The fourth metatarsal is reduced. The second metatarsal bears a medial plantar crest. The tarsometatarsus is more gracile than in members of the Bohaiornithidae and Avisauridae. The hallux is relatively strongly curved.
Etymology
The generic name Feitianius is derived from the feitian, celestial flying apsaras from Buddhist mythology, referencing the murals found in the Mogao Caves near the discovery site. The name was intentionally masculinized, as the specimen is interpreted as male.
The specific name paradisi means “from paradise” in Latin, referring to the inferred sexual dimorphism in the tail feathers, comparable to that of birds-of-paradise.
Biological interpretation
Feitianius paradisi was discovered in 2005 near Changma, Gansu Province, China, in deposits of the Xiagou Formation dated to the Early Cretaceous (Aptian).
The holotype specimen, GSGM-05-CM-004, consists of the posterior portion of a skeleton preserved on a single slab. The specimen is exposed in left lateral view and is partially articulated, although the anterior portion of the skeleton is missing. Extensive soft tissue remains are preserved, including feathers.
Phylogenetic analyses place Feitianius paradisi within Enantiornithes, forming a polytomy with Qiliania and other enantiornithine specimens from the Changma Basin.
（Author: Bai Leng）
Reference
O’Connor, J. K., Li. D. Q., Lamanna, M. C., Wang, M., Harris, J. D., Atterholt, J., You, H. L. (2015). A new Early Cretaceous enantiornithine (Aves, Ornithothoraces) from northwestern China with elaborate tail ornamentation. Journal of Vertebrate Paleontology.
+39.9, +96.8
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