''Histriasaurus'' (HIS-tree-ah-SAWR-us) (meaning "

Istria Istria ( ; Croatian and Slovene: ; ist, Eîstria; Istro-Romanian, Italian and Venetian: ; formerly in Latin and in Ancient Greek) is the largest peninsula within the Adriatic Sea. The peninsula is located at the head of the Adriatic betwee ...

lizard") was a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

dinosaur Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is t ...

from the Early

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of ...

(

Hauterivian The Hauterivian is, in the geologic timescale, an age in the Early Cretaceous Epoch or a stage in the Lower Cretaceous Series. It spans the time between 132.9 ± 2 Ma and 129.4 ± 1.5 Ma (million years ago). The Hauterivian is preceded by t ...

Barremian The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 129.4 ± 1.5 Ma ( million years ago) and 121.4 ± 1.0 Ma). It is a subdivision of the Early Cretaceous Epoch (or Lower Cretaceous Series). It is pre ...

stages Stage or stages may refer to: Acting * Stage (theatre), a space for the performance of theatrical productions * Theatre, a branch of the performing arts, often referred to as "the stage" * ''The Stage'', a weekly British theatre newspaper * St ...

, around 135-125

million years ago The abbreviation Myr, "million years", is a unit of a quantity of (i.e. ) years, or 31.556926 teraseconds. Usage Myr (million years) is in common use in fields such as Earth science and cosmology. Myr is also used with Mya (million years ago). ...

). Its fossils,

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 seve ...

WN V-6, were found in a bonebed in lacustrine limestone exposed on the seafloor off the coast of the town of

Bale Bale may refer to: Packaging * Cotton bale * Hay or straw bale in farming, bound by a baler * Paper bale, a unit of paper measurement equal to ten reams * Wool bale, a standard-sized and -weighted pack of classed wool Places * Bale Zone in ...

on the Istrian peninsula in

Croatia , image_flag = Flag of Croatia.svg , image_coat = Coat of arms of Croatia.svg , anthem = "Lijepa naša domovino"("Our Beautiful Homeland") , image_map = , map_caption = , capit ...

by Dario Boscarolli during the 1980s, and described in 1998 by Dalla Vecchia. It was a

diplodocoid Diplodocoidea is a superfamily of sauropod dinosaurs, which included some of the longest animals of all time, including slender giants like '' Supersaurus'', '' Diplodocus'', '' Apatosaurus'', and '' Amphicoelias''. Most had very long necks and ...

sauropod Sauropoda (), whose members are known as sauropods (; from '' sauro-'' + '' -pod'', 'lizard-footed'), is a clade of saurischian ('lizard-hipped') dinosaurs. Sauropods had very long necks, long tails, small heads (relative to the rest of their ...

, related to, but more primitive than, ''

Rebbachisaurus ''Rebbachisaurus'' (meaning " Aït Rebbach lizard") is a genus of sauropod dinosaur of the superfamily Diplodocoidea, that lived during the Late Cretaceous period in Africa and possibly also South America about 99-97 million years ago. Remains at ...

''. Phylogenetic analyses published in 2007 and 2011 placed ''Histriasaurus'' as the most

basal Basal or basilar is a term meaning ''base'', ''bottom'', or ''minimum''. Science * Basal (anatomy), an anatomical term of location for features associated with the base of an organism or structure * Basal (medicine), a minimal level that is nec ...

member of

Rebbachisauridae Rebbachisauridae is a family of sauropod dinosaurs known from fragmentary fossil remains from the Cretaceous of South America, Africa, North America, Europe and possibly Central Asia. Taxonomy In 1990 sauropod specialist Jack McIntosh included ...

. The

type species In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen( ...

, ''H. boscarollii'', was described by Dalla Vecchia in 1998. The specific name honours the discoverer of the site, Darío Boscarolli. Although some authors consider ''Histriasaurus'' a dubious taxon, more recent papers support the original classification.Apesteguía, S. (2005). "Evolution in the hyposphene-hypantrum complex within Sauropoda". ''In'' K. Carpenter & V. Tidwell (eds.), ''Thunder-Lizards: The Sauropodomorph Dinosaurs''. Indiana University Press, Bloomington 248-267 ''Histriasaurus'' would have coexisted with an indeterminate camarasaurid, an indeterminate

titanosauriform Macronaria is a clade of sauropod dinosaurs. Macronarians are named after the large diameter of the nasal opening of their skull, known as the external naris, which exceeded the size of the orbit, the skull opening where the eye is located (henc ...

, an indeterminate

somphospondyli Somphospondyli is an extinct clade of titanosauriform sauropods that lived from the Late Jurassic until the end of the Late Cretaceous, comprising all titanosauriforms more closely related to Titanosauria proper than Brachiosauridae. The remains ...

an, an indeterminate

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 ...

, an indeterminate

of unknown classification and the

foraminifera Foraminifera (; Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of amoeboid protists characterized by streaming granular ectoplasm for catching food and other uses; and commonly ...

n '' Campanellula capuensis''.F. M. Dalla Vecchia. (1995). Jurassic and Cretaceous sauropod evidence in the Mesozoic carbonate platforms of the southern Alps and Dinarids. In M. G. Lockley, V. F. dos Santos, C. A. Meyer, & A. P. Hunt (eds.), ''Aspects of Sauropod Paleobiology''. GAIA 10:65-73

References

External links

''Histriasaurus'' at Dinosauria On-Line (Backup at ''WayBack Machine'')

''Histriasaurus'' at the ''Paleobiology Database''
Rebbachisaurids Early Cretaceous dinosaurs of Europe Fossil taxa described in 1998 Paleontology in Croatia {{Sauropodomorph-stub