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A morphological and taxonomic revision of the Early Cretaceous Sapeornithidae (Aves: Pygostylia) of Liaoning Province, China

Author: Diana L Pomeroy
Publisher: [Long Beach, California] : California State University, Long Beach, 2013.
Dissertation: M.S. California State University, Long Beach 2013
Series: California State University, Long Beach.; Master's thesis collection, Dept. of Geological Sciences.
Edition/Format:   Thesis/dissertation : Document : Thesis/dissertation   Computer File : English
Summary:
Abstract: The Sapeomithidae are a unique and poorly understood clade of Early Cretaceous birds from the Jehol Group of Liaoning Province, China. Four species of sapeomithids are known: Sapeornis chaoyangensis, Didactylornis jii, Sapeornis angustis, and Shenshiornis primita. Omnivoropteryx sinousaorum is allied with sapeomithids, although its nomenclature remains a source of contention. The validity of these taxa is  Read more...
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Genre/Form: Academic theses
Classification
Material Type: Document, Thesis/dissertation, Internet resource
Document Type: Book, Computer File, Internet Resource
All Authors / Contributors: Diana L Pomeroy
ISBN: 9781303796135 1303796139
OCLC Number: 1015316495
Description: xviii, 180 leaves : illustrations, map, charts
Series Title: California State University, Long Beach.; Master's thesis collection, Dept. of Geological Sciences.
Responsibility: by Diana L. Pomeroy.

Abstract:

Abstract: The Sapeomithidae are a unique and poorly understood clade of Early Cretaceous birds from the Jehol Group of Liaoning Province, China. Four species of sapeomithids are known: Sapeornis chaoyangensis, Didactylornis jii, Sapeornis angustis, and Shenshiornis primita. Omnivoropteryx sinousaorum is allied with sapeomithids, although its nomenclature remains a source of contention. The validity of these taxa is challenged via an in-depth anatomical revision and morphometric analyses involving 18 specimens of sapeomithids, including the aforementioned holotypes. The results reveal that the only anatomical difference separating each species is size, implying a growth series trend among the specimens. This provides clear evidence that these species are junior synonyms of Sapeornis chaoyangensis. In addition, critical anatomical descriptions previously unknown for these specimens expand our knowledge of this clade, paving the way for future anatomical and phylogenetic studies of this enigmatic avian taxon.

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