''Pachymylus'' is an extinct

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 nom ...

of chimaera belonging to the family Callorhynchidae. The type species. ''P. leedsi'' was described by A. S. Woodward in 1892, and is known from the Middle-Late Jurassic (

Callovian In the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 166.1 ± 4.0 Ma (million years ago) and 163.5 ± 4.0 Ma. It is the last stage of the Middle Jurassic, following the Bathonian and preceding the ...

- Oxfordian)

Oxford Clay The Oxford Clay (or Oxford Clay Formation) is a Jurassic marine sedimentary rock formation underlying much of southeast England, from as far west as Dorset Dorset ( ; archaically: Dorsetshire , ) is a county in South West England on the ...

of Peterborough, England. Indeterminate remains of the genus are also known from the Middle Jurassic (

Bajocian In the geologic timescale, the Bajocian is an age and stage in the Middle Jurassic. It lasted from approximately 170.3 Ma to around 168.3 Ma (million years ago). The Bajocian Age succeeds the Aalenian Age and precedes the Bathonian Age. Stra ...

) of France.

References

Prehistoric cartilaginous fish genera Jurassic cartilaginous fish Cretaceous cartilaginous fish Prehistoric fish of Europe Chimaeriformes {{Jurassic-fish-stub