Topic
Marshosaurus
About: Marshosaurus is a research topic. Over the lifetime, 2 publications have been published within this topic receiving 11 citations.
Papers
TL;DR: In this paper, a set of isolated theropod teeth collected in different sites from the Upper Jurassic of the Lusitanian Basin ranging from the late Kimmeridgian tolate Tithonian in age are described and discussed.
Abstract: Purpose Isolated theropod teeth are abundant in the Upper
Jurassic of the Lusitanian Basin and are an important source to
reconstruct the diversity of this group as well as its geographic
and stratigraphic distribution. However, reliably identification
of isolated teeth is complex, especially for those morphotypes
related to poorly represented groups. Herein a set of isolated
theropod teeth collected in different sites from the Upper
Jurassic of the Lusitanian Basin ranging from the late Kimmeridgian tolate Tithonian in age are described and discussed.
Methods These teeth were grouped in seventeen distinct
morphotypes based first on morphology and comparative
anatomy. Multivariate statistical analyses were performed
in order to assign each morphotype to a certain taxon.
Results The current analysis shows the presence of several
groups of theropods such as Ceratosaurus, Torvosaurus,
and Allosaurus beside morphotypes identified as belonging
to indeterminate Megalosauroidea and Allosauroidea and
morphotypes tentatively assigned to Tyrannosauroidea,
Dromaeosauridae, and Richardoestesia. This faunal composition, namely the presence of a non-megalosaurid
megalosauroid possibly related to the piatnitzkysaurid
Marshosaurus, indicates a higher diversity of theropods in
the Late Jurassic of the Lusitanian Basin than previously
known, based on more complete specimens. Results
obtained from this analysis partially agree with previous
studies of other collections with isolated theropod teeth
from the Upper Jurassic of Portugal such as those of the
Guimarota coal mine. However, the presence of velociraptorine dromaeosaurids, compsognathids, and troodontids reported from this site could not be confirmed in the
sample herein analyzed. This analysis also indicates a great
similarity of the theropod faunas from the Late Jurassic of
the Lusitanian Basin and other European chronocorrelative
localities such as those from Spain and Germany.
21 citations
1 Jan 2006
TL;DR: A nearly complete left femur and two tibial fragments (proximal and mid-shaft) of a small theropod dinosaur from the Upper Jurassic Morrison Formation of eastern New Mexico are described in this article.
Abstract: Few dinosaurs have been described from the Upper Jurassic Morrison Formation of eastern New Mexico. Small theropods are rare in the Morrison at all localities and include Coelurus, Ornitholestes, Marshosaurus, Stokesosaurus, Koparion, Elaphrosaurus and Tanycolagreus. NMMNH P-26093 is a nearly complete left femur and two tibial fragments (proximal and mid-shaft) of a small theropod dinosaur from NMMNH locality 363 in Quay County. NMMNH P-26093 is most similar to Tanycolagreus topwilsoni but differs in several features, including: (1) larger cnemial crest; (2) relatively less projecting medial condyle; and (3) incisura tibialis is rectangular rather than arcuate in proximal view. We conservatively assign NMMNH P-26093 to Maniraptora, Coeluridae indet. There is clearly a need for the collection and study of more material of small Morrison theropods.
1 citations
Performance Metrics
| Year | Papers |
|---|---|
| 2017 | 1 |
| 2006 | 1 |