Tamarro
   HOME

TheInfoList



OR:

''Tamarro'' (named after a mythological creature in local culture) is a genus of
troodontid Troodontidae is a clade of bird-like theropod dinosaurs. During most of the 20th century, troodontid fossils were few and incomplete and they have therefore been allied, at various times, with many dinosaurian lineages. More recent fossil discov ...
theropod Theropoda (; ), whose members are known as theropods, is a dinosaur clade that is characterized by hollow bones and three toes and claws on each limb. Theropods are generally classed as a group of saurischian dinosaurs. They were ancestrally c ...
from the
Late Cretaceous The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the ...
Talarn Formation The Tremp Formation ( es, Formación de Tremp, ca, Formació de Tremp), alternatively described as Tremp Group ( es, Grupo Tremp), is a geological formation in the comarca Pallars Jussà, Lleida, Spain. The formation is restricted to the Tr ...
(Tremp Group) of
Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = ''Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , i ...
. The genus contains a single species, ''Tamarro insperatus'', known from a partial
metatarsal The metatarsal bones, or metatarsus, are a group of five long bones in the foot, located between the tarsal bones of the hind- and mid-foot and the phalanges of the toes. Lacking individual names, the metatarsal bones are numbered from the med ...
described in 2021.


Discovery and naming

The
holotype A holotype is a single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several ...
of ''Tamarro'', MCD-7073, a metatarsal, was found in 2003 at the Sant Romà d'Abella site, belonging to the Talarn Formation of the
Tremp Group The Tremp Formation ( es, Formación de Tremp, ca, Formació de Tremp), alternatively described as Tremp Group ( es, Grupo Tremp), is a geological formation in the comarca Pallars Jussà, Lleida, Spain. The formation is restricted to the Trem ...
. In 2021, Sellés ''et al.'' described it as a new genus and species, ''Tamarro insperatus''; the generic name is that of a small creature in the folklore of
Pallars Pallars is a historical and natural region of Catalonia. Located in the Pre-Pyrenees and Pyrenees area, most of its territory is mountainous. The Noguera Pallaresa river is named after this region. Geography The physiography of the Pallars natu ...
, Spain, while the specific name means "unexpected", referring to the unexpected discovery of the fossil.


Classification

Sellés ''et al.'' placed ''Tamarro'' in the
Jinfengopteryginae Jinfengopteryginae is a subfamily of bird-like theropod dinosaurs known from the Cretaceous of Eurasia. This group includes relatively few genera, with members discovered in 2005 but the name erected in 2012. Like other troodontids, this group of ...
, making it the first member of the subfamily from Europe. They also suggested that its ancestors migrated from Asia to Europe sometime between the
Cenomanian The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series. An age is a unit of geochronology; it is a unit of time; the stage is a unit in the s ...
and the
Maastrichtian The Maastrichtian () is, in the ICS geologic timescale, the latest age (uppermost stage) of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval from ...
.


Paleobiology

Analysis of the holotype suggests it was a subadult; its large size suggests it grew quickly early in its life.


Paleoecology

''Tamarro'' lived on the Ibero-Armorican Island, and its discovery increases knowledge about the diversity of small theropods on the Cretaceous European archipelago. It would have lived at the same time as dwarf sauropods and lambeosaurine hadrosaurs.


References

{{Taxonbar, from=Q105728377 Troodontids Fossil taxa described in 2021 Cretaceous Spain Cretaceous dinosaurs of Europe Monotypic dinosaur genera