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Henodus

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Kingdom
  
Superorder
  
Scientific name
  
Henodus chelyops

Rank
  
Genus

Class
  
Reptilia

Species
  
†H. chelyops

Phylum
  
Chordata

Order
  
Placodont

Henodus Sea Monster Pictures Henodus Photos Facts Animals Reports News

Family
  
†HenodontidaeHuene, 1936

Similar
  
Placodont, Placodus, Psephoderma, Placochelys, Hainosaurus

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Henodus chelyops ("Turtle-Faced Single Tooth") was a placodont of the Late Triassic period during the early Carnian age. Fossils of Henodus chelyops were found in Tübingen, Germany. It was around 1 metre (3.3 ft) in length.

Contents

Henodus Henodus filterfeeding Triassic marine reptile Tetrapod Zoology

Henodus was the placodont that had the greatest (albeit superficial) resemblance to a turtle. Like turtles, it had a shell formed from a plastron on the underside and a carapace on top. The carapace extended well beyond the limbs, and was made up of individual plates of bony scutes covered by plates of horn. However, the shell was composed of many more pieces of bone than that of turtles, forming a mosaic pattern. The armor was fused to its spine, and its limbs were situated in normal positions, unlike the turtle, where they are located inside the ribcage. The weak limbs of Henodus suggest it spent little, if any time on land.

Henodus httpsuploadwikimediaorgwikipediacommonsthu

Henodus chelyops also had a single tooth on each side of its mouth, though the remaining teeth were replaced by a beak. Instead, it had baleen-like denticles along the jaws, which combined with a unique feature of the hyoid and musculature indicative of rapid jaw closing indicate a filter feeding lifestyle. The head was squared-off at the front, just ahead of the eyes.

Henodus Henodus chelyops dinosaur

More recently, however, it has been suggested that this placodont was an aquatic herbivore, scraping off vegetation from the bottom with its broad jaws. This suggestion has been brought up in a paper discussing the habits and morphology of Atopodentatus, another Mesozoic aquatic reptile formerly suggested to be a filter-feeder and bearing strongly convergent jaw adaptations, including a similar "hammerhead" jaw tips, though unlike Atopodentatus it's still believed that Henodus relied on filter feeding to obtain plant-matter from the substrates.

Henodus is the only placodont thus far found in non-marine deposits, suggesting it may have lived in brackish or freshwater lagoons.

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References

Henodus Wikipedia


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