Ichthyornis


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Related to Ichthyornis: Ichthyornithes, Ichthyornithiformes

Ichthyornis

[ik·thē′ȯr·nəs]
(paleontology)
The type genus of Ichthyornithidae.
References in periodicals archive ?
Ambiortus, Ichthyornis, Iaceornis, Archaeorhynchus, Baptornis; CLARKE, 2004; KUROCHKIN, 1999; ZHOU & ZHANG, 2005).
On the other hand, in basal ornithurines, such as Yixianornis and Ichthyornis, the n.
The new genus is distinguished from Ichthyornis in the wider coracoidal neck, transversely elongate cotyla scapularis, less defined intermuscular line, and shallower impression for the m.
2004): Morphology, phylogenetic taxonomy, and systematics of Ichthyornis and Apatornis (Avialae: Ornithurae).
In fact, two well-documented Texas specimens of Ichthyornis have been known since 1940, although they apparently have not been described.
Texas specimens of Ichthyornis are of particular importance because of their intermediate geographic position between records from Kansas and Alabama, and because the well-studied biostratigraphy of Texas (especially ammonite zonation) enables a high degree of age resolution for them.
As shown in Table 1, the TMM humeri are similar to the Marsh specimens of Ichthyornis dispar, including the type.
Although it was the second species of Ichthyornis to be described, it was the first to be directly attributed to the genus, and is, therefore, considered the type species (Brodkorb, 1967).
The type specimen of Ichthyornis dispar is from Rooks County, Kansas, from a locality mapped in the combined zones of Cladoceramus undulatoplicatus and Platyceramus platinus by Stewart (1988),--his Protosphyraena Zone D.
It seems distinct from other species of Ichthyornis for which the carpometacarpus is known, as discussed below.
Identification of the carpometacarpus as Ichthyornis is based on the shape of the trochlea of the proximal end.
Identification of this specimen as Ichthyornis also is supported by several other characteristics.