holotype of Crosnoornis nargizia MSFK RR 01/2013b from Rupelian of Rudawka Rymanowska

Diagnoza

Most characteristic relatively short carpometacarpus and tibiotarsus; beak is massive, straight and not hooked at the end, and its length is similar to the length of the braincase, which is similar to the beaks of some extant Suboscines.

Porównanie

Differs from all extant Oscines in morphology of carpometacarpus; from the early Oligocene Wieslochia weissi differs in longer beak length roughly equal to the length of the braincase. Crosnoornis, and the unnamed passerine from the Luberon area have short legs (tibiotarsus being not much longer than the ulna) and very similar beak shapes and it is likely that these birds are closely related (Mayr, 2022); Jamna szybiaki and Resoviaornis jamrozi have a less sturdy beak, distal end of carpometacarpus with os metacarpale minus wider and more protruding distally than os metacarpale majus, phalanx proximalis digiti majoris relatively longer, narrow (and cleaver-shaped in Resoviaornis) and phalanx distalis digiti majoris remarkable shorter that the phalanx proximalis. Among extant Suboscines proportions of the wing bones of Crosnoornis nargizia are most similar to those of Pitta brachyura and Platyrinchus saturatus, and the proportions of the leg bones are most similar to those of Pipra nattereri, Manacus manacus and Mionectes olegineus.

Autekologia

Probably resident bird or a short-distance migrant inhabiting forests and feeding close to the ground in dense shrubs or dense tree crowns; massive and straight beak suggests that this species may have been an opportunistic.

Występowanie geograficzne

only in type locality

Zasięg czasowy

Early Oligocene, Rupelian (32- 30 Ma)

Materiały muzealne

only the type specimen

Literatura

Bocheński, Z.M.; Tomek, T.; Bujoczek, M. i Salwa, G. 2021. A new passeriform (Aves: Passeriformes) from the early Oligocene of Poland sheds light on the beginnings of Suboscines. Journal of Ornithology 162 (2): 593–604.

Mayr G. 2022. Paleogene fossil birds. Second edition. Heidelberg: Springer.