Bathonian

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In the geologic timescale the Bathonian epoch is a stage during the Middle Jurassic, of the Mesozoic era of the Phanerozoic eon. It lasted from approximately 167.7 Ma to around 164.7 Ma (million years ago). The Bathonian age succeeds the Bajocian age and precedes the Callovian age.

The stage takes its name from Bath, a spa town in England built on Jurassic limestone.

Contents 1 Vertebrate Fauna 1.1 Ankylosaurs 1.2 Crocodylomorphs 1.3 Ornithopods 1.4 Sauropods 1.5 Stegosauria 1.6 Thalattosuchians 1.7 Theropods 2 Invertebrate Fauna 2.1 Ammonitida 2.2 Belemnites 3 References

[edit] Vertebrate Fauna

[edit] Ankylosaurs

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Ankylosaurs of the Bathonian
Taxa	Presence	Location	Description	Images
Tianchisaurus Tianchisaurus nedegoapeferima			A Chinese ankylosaur which lacked a club at the end of its tail. Its species epithet honors the main actors of Jurassic Park.

[edit] Crocodylomorphs

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Crocodylomorphs of the Bathonian
Taxa	Presence	Location	Description	Images
Metriorhynchus			An opportunistic carnivore that fed on fish, belemnites and other marine animals and possible carrion. Metriorhynchus grew to an average adult length of 3 meters (9.6 ft), although some individuals may have reached lengths rivaling those of large nile crocodiles.	Metriorhynchus Teleidosaurus, a marine crocodilian (Thalattosuchian).
Steneosaurus
Teleosaurus
Teleidosaurus			The most plesiomorphic known metriorhynchid.

[edit] Ornithopods

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Ornithopods of the Bathonian
Taxa	Presence	Location	Description	Images
Agilisaurus Agilisaurus louderbacki			A four foot long bipedal herbivore that was built for speed. It was discovered in one of China's many Callovian deposits.	Agilisaurus
Hexinlusaurus Hexinlusaurus multidens	Bathonian to Callovian	Lower Shaximiao Formation, Sichuan, China	A small ornithischian dinosaur distinguished from all other basal ornithischians by a single autapomorphy, the presence of a marked concavity that extends over the lateral surface of the postorbital.
Xiaosaurus Xiaosaurus dashanpensis			A poorly known Chinese ornithschian that may be related to Hypsilophodon and Lesothosaurus. It was small and vegetarian.
Yandusaurus Yandusaurus hongheensis		Dashanpu Formation, Sichuan, China	A 5-foot (1.5 m) long Chinese herbivore in the family hypsilophodontidae.

[edit] Sauropods

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Sauropods of the Bathonian
Taxa	Presence	Location	Description	Images
Abrosaurus			Abrosaurus was a small (30 foot adult length) sauropod from China with an unusual skull.	Abrosaurus Shunosaurus
Atlasaurus			A sauropod named after the mountains where the mythological figure that held the world on his shoulders, it attained lengths of 15 meters (50 ft) and lived in Morocco.
Cardiodon			A poorly known English sauropod with heart shaped teeth.
Shunosaurus		Lower Shaximiao Formation, Sichuan, China	A 10 metres long, fairly short-necked sauropod with a short deep skull, with fairly robust spatulate teeth. Its tail ended in a club, probably used for fending off enemies.

[edit] Stegosauria

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Stegosaurs of the Bathonian
Taxa	Presence	Location	Description	Images
Huayangosaurus	Bathonian to Callovian	Lower Shaximiao Formation, Sichuan, China	A 4.5 meters in length quadrupedal herbivore with a small skull and a spiked tail. Bore the distinctive double row of plates, rising vertically along its arched back, of all the stegosaurians and two pairs of long spikes extending horizontally near the end of its tail	Huayangosaurus

[edit] Thalattosuchians

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Thalattosuchians of the Bathonian
Taxa	Presence	Location	Description	Images
Metriorhynchus			An opportunistic carnivore that fed on fish, belemnites and other marine animals and possible carrion. Metriorhynchus grew to an average adult length of 3 meters (9.6 feet), although some individuals may have reached lengths rivaling those of large nile crocodiles.	A life restoration of a Metriorhynchus species. Teleidosaurus
Teleidosaurus			The most plesiomorphic known metriorhynchid.

[edit] Theropods

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theropods of the Bathonian
Taxa	Presence	Location	Description	Images
Gasosaurus			An 11-13 foot predator from China whose discovery was assisted by the petroleum industry.	Megalosaurus
Iliosuchus			A small, 5-foot (1.5 m) long European carnivore related to Tyrannosaurus.
Megalosaurus			The first dinosaur to receive a formal scientific description, Megalosaurus was a 30-foot (9.1 m) carnivore which prowled Jurassic England.
Szechuanoraptor			A Chinese theropod that has yet to be formally described.

[edit] Invertebrate Fauna

[edit] Ammonitida

Members of the order ammonitda are known as Ammonitic ammonites. They are distinguished primarily by their suture lines. In ammonitic suture patterns, the lobes and saddles are much subdivided (fluted) and subdivisions are usually rounded instead of saw-toothed. Ammonoids of this type are the most important species from a biostratigraphical point of view. This suture type is characteristic of Jurassic and Cretaceous ammonoids but extends back all the way to the Permian.

• Cadomites
• Oecoptychius
• Oxycerites
• Somalinautilus

†Ammonitids of the Aalenian
Taxa	Presence	Location	Description	Images
Asphinctites	Confirmed.[1]		The	Life restorations of two different ammonite genera.
Cranocephalites	Confirmed.[1]
Epistrenoceras	Confirmed.[1]
Garantiana	Confirmed.[1]
Lissoceras	Confirmed.[1]
Nannolytoceras	Confirmed.[1]
Oecotraustes	Confirmed.[1]
Okribites	Confirmed.[1]
Parkinsonia	Confirmed.[1]
Procerites	Confirmed.[1]
Siemiradzkia	Confirmed.[1]

[edit] Belemnites

Belemnites of the Bathonian
Taxa	Presence	Location	Description	Images
Produvalia				Small belemnite fossils

Jurassic period
Lower/Early Jurassic	Middle Jurassic	Upper/Late Jurassic
Hettangian | Sinemurian Pliensbachian | Toarcian	Aalenian | Bajocian Bathonian | Callovian	Oxfordian | Kimmeridgian Tithonian

[edit] References