The Hettangian is the earliest age and lowest stage of the Jurassic Period of the geologic timescale. It spans the time between 201.3 ± 0.2 Ma and 199...

conocauda is known from Posidonia Shale, and C. montefiorei is known from the Hettangian strata of the Blue Lias Formation and from Charmouth Mudstone Formation...

Early Jurassic, but also including part of the preceding Rhaetian. The Hettangian Stage was named by Swiss palaeontologist Eugène Renevier in 1864 after...

chronostratigraphy). It was preceded by the Norian and succeeded by the Hettangian (the lowermost stage or earliest age of the Jurassic). The base of the...

Sinemurian is preceded by the Hettangian and is followed by the Pliensbachian. In Europe the Sinemurian age, together with the Hettangian age, saw the deposition...

just outside the crown group of Orectolobiformes. It is known from the Hettangian-Sinemurian of Lyme Regis, England and the Pliensbachian-aged Hasle Formation...

A frog is any member of a diverse and largely carnivorous group of short-bodied, tailless amphibians composing the order Anura (coming from the Ancient...

Lizard is the common name used for all squamate reptiles other than snakes (and to a lesser extent amphisbaenians), encompassing over 7,000 species, ranging...

quadrupedal locomotion Abrictosaurus 1975 Elliot Formation (Early Jurassic, Hettangian to Sinemurian)  Lesotho  South Africa Known from two skulls, one of which...

Belemnitida. These cephalopods existed in the Early Jurassic period from the Hettangian age (196.5–199.6 mya) to the Toarcian age (175.6–183.0). They were fast-moving...

meaning 'lizard') is a genus of ichthyosaurs from the Early Jurassic (Hettangian - Pliensbachian) of Europe (Belgium, England, Germany and Portugal). Some...

Toarcian 184.2 ± 0.7 * Pliensbachian 192.9 ± 1.0 * Sinemurian 199.5 ± 0.3 * Hettangian 201.4 ± 0.2 * Triassic Upper/Late Rhaetian Archosaurs dominant on land...

to the suborder Darwinulocopina is described from the Lower Jurassic (Hettangian) Whitmore Point Member of the Moenave Formation (Arizona and Utah, United...

"flat stone". There has been some debate over the actual base of the Hettangian Stage, and so of the Jurassic System itself. Biostratigraphically, the...

Notocupes is an extinct genus of medium-sized archostematan beetles from the Mesozoic Era of Eurasia, including over 50 described species. Historically...

lechiguanae. Dornraptor Gen. et sp. nov Valid Baron Early Jurassic (Hettangian–Sinemurian) Blue Lias Formation  United Kingdom An averostran theropod...

recovery began in the late early Hettangian and lasted until a new biodiversity equilibrium in the late Hettangian. Also despite recurrent anoxic episodes...

extinct genus of prehistoric bony fish that lived during the Rhaetian-?Hettangian ages (Late Triassic-?Lower Jurassic boundary). The type species, S. dubia...

oldest specimen may be a skull thought to come from late Rhaetian or early Hettangian rocks. Paleontology portal Timeline of plesiosaur research List of plesiosaur...

Wartlike load casts in Hettangian arkoses from the northern Aquitaine Basin...

Formation, United Kingdom, Rhaetian/Hettangian Orthophlebia varia Martynova 1948 Dzhil Formation, Kyrgyzstan, Hettangian-Sinemurian Orthophlebia venosa Martynov...

of Osteno, Italy, and indeterminate teeth are known from the earlier Hettangian of Belgium. Divergence estimates suggest that Squaloraja was a relict...

Changhsing. Olenekian Induan Anisian Ladinian Carnian Norian Rhaetian Hettangian         Subdivision of the Triassic according to the ICS, as of 2023....

Unwin, D.M. (1993). "An ichthyosaur embryo from the Lower Lias (Jurassic: Hettangian) of Somerset, England, with comments on the reproductive biology of ichthyosaurs"...

−150 — – −145 — – Mesozoic T Jurassic K Late T Early Middle Late Early K Hettangian Sinemurian Pliensbachian Toarcian Aalenian Bajocian Bathonian Callovian...

Early Jurassic period. They lived between 200 and 175 million years ago (Hettangian-Toarcian) in what is now Western Europe (England, France, Luxembourg,...

Gyrinidae, the only species in the genus Anagyrinus. It is known from the Hettangian aged Insektenmergel Formation of Switzerland Gyrinidae Species List at...

with the oldest known species being Schobertella hoelderi from the late Hettangian of Germany. Hermit crabs can be informally divided into two groups: aquatic...

Conodonts Temporal range: Middle Cambrian to Earliest Jurassic (Hettangian) PreꞒ Ꞓ O S D C P T J K Pg N Conodont elements Scientific classification Domain:...

phalanx series, and a shortened tail. From the earliest Jurassic, the Hettangian stage, a rich radiation of plesiosaurs is known, implying that the group...