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Titanosaurian teeth from Lo Hueco site (Cretaceous, Spain)



Ben Creisler
bcreisler@gmail.com

A new online paper:

Verónica Díez Díaz, Francisco Ortega & José L. Sanz (2014)
Titanosaurian teeth from the Upper Cretaceous of "Lo Hueco" (Cuenca, Spain).
Cretaceous Research 51: 285–291
DOI: 10.1016/j.cretres.2014.07.003
http://www.sciencedirect.com/science/article/pii/S0195667114001360


The Upper Cretaceous fossil site of “Lo Hueco” (Cuenca, Spain) has
yielded two morphotypes of sauropod teeth referable to Titanosauria.
One (“Lo Hueco” morphotype A) is composed of robust spatulate crown
teeth. These teeth exhibit the same morphology and microwear patterns
in the apical facet as teeth described from the Massecaps site (Upper
Cretaceous of southeastern France). The second morphotype (“Lo Hueco”
morphotype B) comprises gracile spatulate teeth similar to those of
the French titanosaur genus Atsinganosaurus. However, further analysis
of skeletal and cranial elements from “Lo Hueco” and its association
with the described dental morphotypes will be needed to establish the
degree of proximity between the Iberian and French taxa.

The presence of at least two more titanosaurian taxa in the Iberian
Peninsula, besides the well-known species Lirainosaurus astibiae,
corroborates the increase in the known diversity of the sauropod
faunae from the Upper Cretaceous of the Ibero-Armorican Island
suggested by previous studies on the biota of “Lo Hueco”. In addition,
the microwear differences found in the apical wear facets of the two
morphotypes could be explained as due to different diets. The absence
of isolated pits and the orientational consistency of the scratches
support the hypothesis of a non-selective diet on soft stems, as
herbaceous plants, for the titanosaurs from “Lo Hueco”. However, the
presence of a coarser pattern in morphotype B suggests a niche
partition for both species.