Palaeoscinis

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Palaeoscinis
Temporal range: Middle
Ma
(Mohnian)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Suborder: Passeri
Family: Palaeoscinidae
Howard, 1957
Genus: Palaeoscinis
Howard, 1957
Species:
P. turdirostris
Binomial name
Palaeoscinis turdirostris
Howard, 1957

Palaeoscinis (meaning "ancient oscine") is an

monotypic family Palaeoscinidae, and contains the type
and only species P. turdirostris.

The fossil was first discovered in 1955 on two slabs of

tracheal rings. The fossil was found in marine sediments, but the anatomy of Palaeoscinis indicates that it was a songbird rather than a seabird. The specific name was chosen for the thrush
-like shape of its beak.

The beak is long and slender, similar to that of the modern varied thrush, and its body proportions are also generally similar to thrushes. The legs are relatively short, though, unlike thrushes, and are shorter than the bones of the wing. Feather imprints on the slab suggest the wings may have been relatively short, although it is possible that they were not fully preserved. The foot is typical of songbirds, with a reversed 1st toe and three forward facing ones, of which the middle is the longest and the 2nd is the shortest, with the 1st and 4th toes roughly equal in length. The three forward facing claws are short, but the claw of the reversed 1st toe is long, approximately 70% the length of the preceding toe bone.

Palaeoscinus was assigned to its own family due to the combination of skeletal characteristics (mostly of the

Cinclidae
(dippers) by Howard (1957). It was provisionally allocated as closest to the Pycnonotidae over the other families by Wetmore (1960) based on its proportions, although this relationship is not certain.

The area has produced fossils of other marine animals, including fossils of a

pelagornithid Osteodontornis, as well as a porpoise and fish, alongside fossils of palms
.

References