''Transylvanosaurus'' (meaning "lizard from across the forest") is an

extinct Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...

genus of

rhabdodontid Rhabdodontidae is a family of herbivorous iguanodontian ornithopod dinosaurs whose earliest stem members appeared in the middle of the Lower Cretaceous. The oldest dated fossils of these stem members were found in the Barremian Castrillo de la Re ...

ornithopod Ornithopoda () is a clade of ornithischian dinosaurs, called ornithopods (). They represent one of the most successful groups of herbivorous dinosaurs during the Cretaceous. The most primitive members of the group were bipedal and relatively sm ...

dinosaur from the Late Cretaceous (

Maastrichtian The Maastrichtian ( ) is, in the International Commission on Stratigraphy (ICS) geologic timescale, the latest age (geology), age (uppermost stage (stratigraphy), stage) of the Late Cretaceous epoch (geology), Epoch or Upper Cretaceous series (s ...

) Hateg Basin of

Romania Romania is a country located at the crossroads of Central Europe, Central, Eastern Europe, Eastern and Southeast Europe. It borders Ukraine to the north and east, Hungary to the west, Serbia to the southwest, Bulgaria to the south, Moldova to ...

. The type species is ''Transylvanosaurus platycephalus'', known from a fragmentary skull.

Discovery and naming

The

holotype A holotype (Latin: ''holotypus'') is a single physical example (or illustration) of an organism used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of s ...

specimen, LPB (FGGUB) R.2070, was found in 2007 in the ‘Pui Beds’ in the

Bărbat River Bărbat was the brother and successor of ''voivode'' Litovoi whose territory had comprised northern Oltenia (Romania). War with Hungary In 1277 (or between 1277 and 1280), Litovoi renounced fealty to king Ladislaus IV of Hungary (1272–1290) w ...

Valley section of Haţeg Basin,

Hunedoara County Hunedoara County () is a county (''județ'') of Romania, in Transylvania, with its capital city at Deva, Romania, Deva. The county is part of the Danube–Criș–Mureș–Tisa Euroregion. Name In Hungarian language, Hungarian, it is known as , ...

, Romania. This locality is dated to the middle

age of the

Late Cretaceous The Late Cretaceous (100.5–66 Ma) is the more recent 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 ''cre ...

period. It consists of a fragmentary skull, including the articulated basicranium and articulated frontals. In 2022, ''Transylvanosaurus platycephalus'' was described as a new genus and species of rhabdodontid ornithopod dinosaurs by Felix J. Augustin, Dylan Bastiaans, Mihai D. Dumbravă, and Zoltán Csiki-Sava based on these remains. The generic name, "''Transylvanosaurus''", is derived from the

Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...

words "trans", meaning "across" and "silva", meaning "forest", and the

Greek Greek may refer to: Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group *Greek language, a branch of the Indo-European language family **Proto-Greek language, the assumed last common ancestor of all kno ...

word "sauros", meaning "lizard" (σαύρος). The generic name references Transylvania, the region that contains the type locality of the genus in the Haţeg Basin . The

specific name Specific name may refer to: * in Database management systems, a system-assigned name that is unique within a particular database In taxonomy, either of these two meanings, each with its own set of rules: * Specific name (botany), the two-part (bino ...

, "''platycephalus''", combines the Greek words "platys" (πλατύς), meaning wide, and "kephale" (κεφαλῇ), meaning head, in reference to the unusual width of the skull compared to related taxa.

Classification

In their

phylogenetic analyses In biology, phylogenetics () is the study of the evolutionary history of life using observable characteristics of organisms (or genes), which is known as Computational phylogenetics, phylogenetic inference. It infers the relationship among organ ...

, Augustin et al. (2022) recovered ''Transylvanosaurus'' as a member of the

Rhabdodontidae Rhabdodontidae is a family of herbivorous iguanodontian ornithopod dinosaurs whose earliest stem members appeared in the middle of the Lower Cretaceous. The oldest dated fossils of these stem members were found in the Barremian Castrillo de l ...

. The

cladogram A cladogram (from Greek language, Greek ''clados'' "branch" and ''gramma'' "character") is a diagram used in cladistics to show relations among organisms. A cladogram is not, however, an Phylogenetic tree, evolutionary tree because it does not s ...

below displays the results of their phylogenetic analyses. Despite these results, Augustin et al. propose "particularly close relationships" with ''Rhabdodon'' based on morphological comparisons.

References

{{Authority Control Rhabdodontidae Dinosaur genera Maastrichtian dinosaurs Fossil taxa described in 2022 Dinosaurs of Romania